9-Day Fly Fishing: East Rosebud to Kersey Lake Trek on Montana’s Beaten Path
Have you ever imagined leaving your daily routine behind for a week or more of an amazing 9-Day Fly Fishing: East Rosebud to Kersey Lake Trek backpacking? Picture clear alpine lakes in the Beartooth wilderness and fly fishing for trout, perhaps some native Yellowstone cutthroat trout that have rarely seen a hook. If this sounds like your dream, Montana’s Absaroka-Beartooth Wilderness, part of the Custer Gallatin National Forest, is calling you. Specifically, a 9-Day Backpacking Fly Fishing Adventure East Rosebud Trailhead to Kersey Lake could be that dream trip. As you may have noticed reading on this site I have always been a section hiker all my life. Not to say thru hikes aren’t cool. I just wish to slow down and smell the flowers and hook a few trout. It’s a personal thing. I also carry way too much gear.
On this journey, you will stop to fish at iconic spots like Rainbow Lake, Lake at Falls, and Dewey Lake. You will also explore the waters of Fossil Lake, Russell Lake, and Marianne Lake, each offering distinct fishing experiences within the vast Gallatin National Forest. This 9-Day Backpacking Fly Fishing Adventure East Rosebud Trailhead to Kersey Lake is structured to give you stories and memories that will last for many years, taking you deep into the Beartooth Range.
This 26-mile trip follows the famous Beaten Path trail, a premier adventure for both anglers and hikers through the stunning Montana backcountry. You get wild country, stunning views from high feet elevation points, and excellent Rocky Mountain fly fishing opportunities for species like the prized Yellowstone cutthroat. I’ll share the best fly patterns to help keep the trout biting and offer some tips so you stay safe from grizzly bears in this part of the national forest. This guide will walk you through your next big adventure along the East Rosebud Trail, a classic lake trail experience. All Part of the Greater Yellowstone Eco-system.
Table of Contents
Why Choose the Absaroka-Beartooth Wilderness?
The Absaroka-Beartooth Wilderness holds a special allure for adventurers and anglers alike. Covering almost 944,000 acres in Montana and Wyoming, it forms a significant and wild portion of the Custer Gallatin National Forest. Imagine nature’s grand art display: tall granite peaks, valleys carved by ancient glaciers, and over 300 alpine lakes, including gems like Shelf Lake and Island Lake. This vast area, overseen by the Forest Service, provides a genuine escape into raw, beautiful nature, far from any bustling city.
It offers a profound quiet and solitude that is increasingly hard to find in the modern world. The air here is fresh, the water in streams like Rosebud Creek and the Broadwater River headwaters is pure, and wildlife is abundant. This setting deep within the national forest enhances the feeling of being truly away from civilization, a place to reconnect with the natural rhythm of the world and perhaps attempt some cross country exploration to more remote basins.
Venturing into this wilderness means stepping onto storied trails like the Rosebud Trail or the Clarks Fork Trail, which lead to pristine environments where fish like the Yellowstone Cutthroat Trout thrive. The region offers unparalleled opportunities for backcountry experiences, whether you are an experienced mountaineer or a family looking for an unforgettable hike. Many of the lakes, accessible via the extensive lake trail system, remain untouched by crowds, promising an authentic wilderness adventure away from the more heavily trodden paths near a typical lake trailhead.
The Beaten Path: Your Route to Adventure
The Beaten Path, officially designated as the Beaten Path Trail, is the core of this wilderness adventure. This 26-mile trail offers a point-to-point journey through some of the most spectacular country in the Beartooth Wilderness. It connects the East Rosebud Trailhead near Roscoe, Montana, to the Clarks Fork Trailhead near Cooke City and the northeastern boundaries of Yellowstone National Park.
While “Beaten Path” might suggest a busy thoroughfare, it is well-maintained, and its popularity stems from the incredible views and access it provides to the high alpine environment. The path trail segment of the Rosebud Trail leads past approximately 15 alpine lakes, many teeming with Yellowstone cutthroat trout, rainbow, and brook trout. You will find ample peace and solitude, allowing you to feel like you’ve discovered a secret corner of the Gallatin National territory.
Our itinerary starts at the East Rosebud Trailhead, situated at an elevation of 6,280 feet near East Rosebud Lake. From there, you will experience significant elevation gain, climbing about 3,700 feet to the trail’s high point at Fossil Lake, which sits majestically at 9,750 feet elevation on the expansive lake plateau. After reaching this apex near features like Clay Butte, the trail descends towards Kersey Lake and eventually the Clarks Fork of the Yellowstone River, a journey through the heart of the Beartooth Range.
This direction, starting from East Rosebud, is considered more strenuous than beginning at the Clarks Fork Trailhead (also known as the Fork Trailhead) due to the greater cumulative uphill walking. However, the breathtaking views up the East Rosebud Lake valley make every challenging step worthwhile. Furthermore, this approach allows you to hit numerous prime fishing spots like Elk Lake and Rainbow Lakes along the East Rosebud Trail segment. Those well-earned aching muscles will feel like a fair trade for the experiences gained while traversing this iconic creek trail. Get your backpack ready, tie on a Parachute Adams or a small black woolly bugger, and let us start this journey.
Elk Lake
The right outdoor apparel will make or break a trip like this. I lived in my Heavy Weight Hydrophobic Graphic Hoodie most of the trip. On warmer afternoons my base layer a UPF-50 Sun Protective Graphic Hoodie with thumb cuffs and sewn in Facemask. Always had my Sun Protective Graphic Gloves on. I carry two pair they are light, handy and always good to have a dry pair on hand 🙂 .
Heavy Weight Hydrophoic Graphic Hoodie-Tranquility
Sun Protective Graphic Gloves-Brown Trout
Day 1: East Rosebud Trailhead to Elk Lake (4 miles)
Your grand adventure commences at the East Rosebud Trailhead, a popular starting point for many journeys into the Absaroka-Beartooth Wilderness. Accessing the trailhead involves a 13-mile drive from Roscoe, Montana, primarily on the gravel Rosebud Road. This road can be quite bumpy and rutted, particularly after rain, so it will test your vehicle’s suspension and your patience; a vehicle with high clearance is strongly recommended. Otherwise, you might find your first day involves an unplanned hike just to reach the actual Rosebud Trailhead, a less than ideal start to your trip through the Custer Gallatin National Forest.
The East Rosebud Trail itself starts by following East Rosebud Creek, a waterway designated as a Wild and Scenic River, reflecting its pristine quality and natural beauty. You will walk through picturesque meadows dotted with large boulders and pass through stands of quaking aspens that line the path, typical scenery for the Gallatin National area. These scenes are straight out of a Montana postcard, and the visual splendor starts almost immediately, offering a gentle introduction to the wild character of the Beartooth Range as you head east into the canyon.
After approximately 4 miles of mostly easy climbing with moderate elevation gain, you arrive at Elk Lake, your first designated lake camp. The trail to Elk Lake, sometimes referred to as the Creek Trail due to its proximity to Rosebud Creek, winds through lush forests offering some easy access to fishing spots. It also presents breathtaking views of the Froze to Death Plateau’s steep cliffs, a dramatic backdrop to your hike. There are several established backcountry campsites available here, though remember these are primitive sites within a national forest, so do not expect luxury amenities. You will need a sturdy tent and bear spray; grizzlies and black bears are inhabitants of this area, and preparedness is crucial as you are a guest in their home. Before setting up your camp at Elk Lake (a type of creek lake formed along Rosebud Creek), consider trying your luck fishing in the lake itself or casting a line into the nearby creek. The waters here are teeming with lively rainbow and Yellowstone cutthroat trout, fish that generally see fewer anglers than those closer to more accessible lake trailhead areas. This often means they might be a bit more eager to inspect your offering, providing a great first taste of the excellent fishing that awaits on this east rosebud adventure.
Camping Notes for Elk Lake
A critical camping tip for Elk Lake and throughout the Absaroka-Beartooth Wilderness is to hang your food. Ensure it is stored at least 100 yards away from your tent. Bears possess an incredibly keen sense of smell and do not require an invitation to investigate potential food sources. You certainly do not want to wake up to find one examining your granola bars at your chosen lake camp.
For more detailed bear safety guidelines, consult the Montana Fish, Wildlife & Parks website or resources from the Forest Service. They provide excellent information on how to stay safe in bear country within the Custer Gallatin National Forest. Following these guidelines helps protect both you and the resident wildlife.
Day 2: Elk Lake to Rimrock Lake (3 miles)
Day two involves a shorter hike of about 3 miles, but it presents a significant challenge as you climb from Elk Lake to Rimrock Lake. The lake trail includes some serious switchbacks that ascend steeply through a substantial boulder field, a classic feature of the Beartooth Range. This section will undoubtedly get your heart pumping and your leg muscles working; take your time, hydrate, and watch your footing carefully on the uneven terrain.
The trail itself dramatically cuts below a massive, sheer rock wall, showcasing the rugged geology of the Absaroka-Beartooth Wilderness. When Rimrock Lake finally comes into view, the scene is breathtaking – you might feel as though you’ve walked directly into a masterpiece. The water is a striking teal-blue, with steep mountains rising majestically around its perimeter, and plenty of hardy alpine trees dot the landscape. At the foot of the lake, a wide, sturdy bridge makes crossing the outlet stream easy and straightforward, allowing good views down towards Rosebud Creek.
The western shore of Rimrock Lake offers a few excellent campsites, well worth the effort to reach, providing stunning views across the water towards the imposing cliffs, forming a natural cliff lake setting. These good campsites are coveted, so an early arrival can be beneficial. Some areas near Rimrock Lake may remind experienced hikers of landscapes near Mystic Lake or the West Boulder drainage in terms of raw, alpine beauty.
Fly Fishing at Rimrock Lake
The trout in Rimrock Lake, often a mix of rainbow and Yellowstone cutthroat trout, are not as wary as fish in heavily fished lowland rivers, but they are not complete pushovers either. They will still make you work for a bite. For some fun dry-fly action, try using a Royal Wulff. A size #14 or #16 should do the trick, especially if caddisflies or mayflies are hatching. The unspoken about pattern the works well are trudes. I like a crystallized red or orange flash center band. Other wise tied traditional.
If you need to fish deeper water, consider a Hare’s Ear Nymph in size #16 or #18. A Copper John in size #16 can also get your fly down to where the cutthroat trout are lurking. A great spot to focus on is the inlet, where the creek dumps fresh, oxygen-rich water into the lake. Trout often congregate here, waiting for food to drift by, particularly near the lake head.
Trail Tips for Day Two
Be aware that the boulder field on the approach to Rimrock Lake can become very slick, especially after a rain shower. So, watch your step carefully on this segment of the east rosebud trail. You do not want to perform an unplanned, awkward dance on the rocks. Using trekking poles can significantly help with stability on this section and reduce strain, saving you from a potential slip or a twisted ankle.
Day 3: Rimrock Lake to Rainbow Lake (3 miles)
From Rimrock Lake, your journey on the Beaten Path trail continues for another 3 miles. Your destination is Rainbow Lake, one of the first major fishing stops on your itinerary and a jewel of the Beartooth Wilderness. The trail climbs at a steady pace, passing through open terrain that offers spectacular views of the East Rosebud Valley and the surrounding peaks of the Beartooth Range. Every turn seems to reveal a new, more impressive vista, showcasing the grandeur of the Custer Gallatin National Forest.
Rainbow Lake itself is a true stunner, one of several Rainbow Lakes in the broader region but arguably the most famous on this route. It is nestled beautifully below jagged mountain peaks, some of which hold snow year-round. Glacial streams feed the lake, keeping its waters cold and exceptionally clear. It is a popular spot for hikers and anglers pursuing Yellowstone cutthroat trout, so you should expect to see some other people, especially if you are there on a weekend during peak season. Try to set up your camp early. This gives you the best chance to get one of the good campsites near the lake’s outlet, which often have the best views and access to the water.
Fly Fishing at Rainbow Lake
Rainbow Lake certainly lives up to its name, holding vibrant populations of both cutthroat and rainbow trout. When insects are hatching on the surface, an Elk Hair Caddis is a great choice. Use a size #14 or #16. A Blue-Winged Olive in size #16 or #18 will also get rises from feeding fish. If the surface activity is quiet, you will need to go subsurface.
Try a Prince Nymph, size #14 or #16, or a Zebra Midge in size #18 or #20 drifted under a small indicator. These can be effective for the sometimes-finicky Yellowstone cutthroat. Concentrate your fishing efforts on the inlet and outlet streams of this glacier lake. Trout tend to gather in these areas where the current brings them a steady supply of food. Approach the water quietly and try to stay hidden; these fish are well-educated and can spot a clumsy angler from a distance. They have earned their PhDs in spotting danger on this popular lake trail.
Important Note for Rainbow Lake
Remember that Rainbow Lake is quite chilly, even during the peak of summer. The high feet elevation and glacial meltwater keep temperatures low. So, pack a lightweight puffy jacket for the evenings. Do not even consider going for a swim unless you are preparing for the Polar Bear Club; it is refreshing for about two seconds, then just intensely cold.
Day 4: Rainbow Lake to Lake at Falls (2 miles)
Day four features a short 2-mile hike from Rainbow Lake. Your destination is Lake at Falls, but do not let the short distance make you complacent. It is a tough little grunt of a climb. The trail, still part of the main Beaten Path Trail, ascends steeply, passing by cascading waterfalls and impressive granite cliffs. The views along this section are so good they will make you momentarily forget your calves are burning from the exertion and elevation gain.
Lake at Falls is a true jewel of the Beartooths, tucked beneath towering mountain peaks within the Absaroka-Beartooth Wilderness. A dramatic waterfall feeds the lake, and the waterfall itself is almost begging you to take a photo; it is a picture-perfect alpine scene. Campsites around Lake at Falls are somewhat limited, so arriving early is a good strategy to claim a good spot. This gives you more choice and less stress, allowing more time to appreciate this stunning location in the Custer Gallatin National Forest.
Fly Fishing at Lake at Falls
This high-alpine lake is home to feisty Yellowstone cutthroat trout. These fish will eagerly slam a well-presented fly. During late summer, when grasshoppers are active and bouncing around, a Parachute Hopper works wonders. Try a size #12 or #14. For fishing subsurface, a San Juan Worm in size #14 can be surprisingly effective, especially in the deeper sections.
A Beadhead Pheasant Tail, size #16, will also fool trout in the deeper pools, particularly near the waterfall’s plunge pool. To avoid the wind, try to fish early in the morning or late in the evening. The wind can pick up during the day and turn this beautiful lake into a choppy washing machine, making casting and presentation much harder on this challenging lake trail section.
Gear Suggestion for Alpine Lakes
Consider packing two fly rods, a nine foot-six weight and a lightweight tenkara rod for these smaller alpine lakes like Lake at Falls or even a more remote Shelf Lake if you were to venture off-trail. Also become efficient at roll casting for close quarters along the shoreline, which you often find around these mountain lakes in the Beartooth Range. For local gear recommendations, you might look into what outfitters familiar with the East Rosebud area suggest
Day 5: Lake at Falls to Dewey Lake (4 miles)
Today’s 4-mile trek takes you from Lake at Falls to Dewey Lake, another highlight on the Beaten Path. The trail winds its way through stunning alpine meadows. These meadows burst with wildflowers in the summer, painting the landscape with vibrant purples, yellows, and reds that would make any painter jealous. It is a truly beautiful high-country landscape within the Gallatin National Forest.
Along the way, you will pass Twin Outlets Lake and a stunning slot canyon waterfall before finally reaching Dewey Lake. Dewey Lake is a sprawling, beautiful body of water, with the majestic Mount Dewey serving as an impressive backdrop. This part of the East Rosebud Trail system is pure magic as you hike through boulder-strewn meadows and potentially cross lingering snowfields, even in mid-summer. The views are so continuous you will find yourself stopping every few minutes for photos.
Fly Fishing at Dewey Lake
The rainbow and Yellowstone cutthroat trout in Dewey Lake are often hungry and generally less pressured than fish in lower elevation lakes near a busy lake trailhead. A Chernobyl Ant, perhaps in size #10 or #12, is a fantastic dry fly for summer fishing here. A Chubby Chernobyl in size #12 also works very well; trout find these big, buggy profiles hard to resist. These larger patterns can be particularly effective along the edges of this large creek lake, which is fed by substantial inflows.
For nymphing, try a Lightning Bug in size #16 or #18. A Soft Hackle Pheasant Tail, size #16, drifted near the inlet can also be productive. The northern edge of Dewey Lake offers good vantage points for casting and provides access to some deeper water where larger fish might hold. Exploring different parts of this sizable lake can yield diverse fishing experiences.
Camping Details for Dewey Lake
Dewey Lake has some excellent and good campsites, many of which also have ample firewood available from downed trees. Campfires are allowed here, which is a nice change from some higher elevation lakes like Fossil Lake that have restrictions. Just remember to follow Leave No Trace principles diligently. Do not be the person who leaves a trashed campsite behind for others to find; always pack out everything you pack in to protect this part of the Absaroka-Beartooth Wilderness.
Day 6: Dewey Lake to Fossil Lake (2 miles) – The Trail’s High Point
The journey on day six is a short but steep climb of about 2 miles to Fossil Lake. This lake marks the Beaten Path Trail’s high point, sitting at an impressive elevation of 9,750 feet elevation on the expansive lake plateau. The scenery here is truly next-level awesome, with wide-open plateaus, towering granite walls, and hardy wildflowers clinging to life in these harsh, beautiful conditions of the Beartooth Range. This leg of the 9-Day Backpacking Fly Fishing Adventure East Rosebud Trailhead to Kersey Lake is breathtaking and offers panoramic views, possibly even glimpses of distant features like Clay Butte on a clear day.
Fossil Lake is aptly named for its sprawling, somewhat skeletal shape, almost looking like it belongs in a paleontology museum. This is the last lake on this particular route where campfires are banned, a regulation enforced by the Forest Service to protect the fragile alpine environment. So, make sure you have a reliable stove for cooking your meals and plan accordingly. This area is a prime example of the raw beauty found in the Custer Gallatin National Forest.
Fly Fishing at Fossil Lake
Fossil Lake’s high elevation means the Yellowstone cutthroat trout are typically smaller, but they are scrappy and fun to catch. These are mostly pure-strain cutthroat. A Black Ant pattern in size #14 or #16 can get their attention. A Parachute Adams, size #16, will also work well, especially during sparse hatches in this stark, beautiful glacier lake.
For subsurface fishing, try a Flashback Pheasant Tail nymph, size #18. A Chironomid pattern, also around size #18, can be effective in the lake’s clear, shallow water. Focus your efforts near the outlet where the current attracts trout. Remember to keep your casts delicate and your movements slow; these high-country fish can spook very easily. Any sudden shadow or clumsy cast will send them scattering from the shallows.
Weather Considerations at Fossil Lake
The plateau around Fossil Lake can get hit hard by wind and storms, which can happen even in the middle of summer. So, pack a sturdy tent that can handle strong gusts. It is also wise to check the weather forecast before heading up to this elevation, as conditions in the Beartooth Wilderness can change rapidly. Snow is not unheard of here, even in July. Being prepared for variable weather is crucial for safety and comfort at this high point of your East Rosebud Trail adventure.
Day 7: Fossil Lake to Russell Lake (3 miles)
From Fossil Lake, the trail officially transitions. You leave the East Rosebud Trail segment and join the Russell Creek Trail. This junction is usually marked by a large cairn, a pile of stones, guiding hikers along the Beaten Path. It is a 3-mile descent down to Russell Lake (sometimes spelled Russel Lake on older maps). This section takes you past several other beautiful alpine lakes, including Windy Lake, Skull Lake, Bald Knob Lake, and Ouzel Lake, each a stunner in its own right—a veritable chain of alpine gems in the Absaroka-Beartooth Wilderness.
The terrain here opens up into classic Beartooth alpine scenery. Expect rolling meadows, sheer cliffs, and snowfields that can linger well into August. Russell Lake itself is a serene and peaceful spot, offering a few good campsites. They are perhaps less dramatically scenic than those at Dewey Lake or Fossil Lake, but still very nice. The quiet atmosphere here, along Russell Creek, is a welcome reward after the day’s hike through the Custer Gallatin National Forest.
Fly Fishing at Russell Lake
The cutthroat and rainbow trout in Russell Lake are generally eager to bite, providing good sport for anglers. However, they can also be selective at times, especially if there is heavy angling pressure. A Royal Coachman dry fly, size #14 or #16, can draw strikes during hatches of mayflies. An Elk Hair Caddis, size #14, is another reliable choice when caddis are active.
If you need to go subsurface with nymphs, a Copper John in size #16 is a good bet for reaching fish holding deeper. A Zebra Midge, size #18, fished under a small indicator, can also be effective, especially when fish are picky about their meals. For the best results, try fishing near the inlet or outlet streams where Russell Creek flows. Also, keep an eye out for rising fish in the evening as aquatic insects become more active; this can be a prime time to cast a dry fly for Yellowstone cutthroat trout.
Trail Tip for Day Seven
The descent from Fossil Lake to Russell Lake can be tough on your knees. The constant downhill trekking takes its toll. So, using trekking poles is highly recommended. They help with stability and reduce the impact on your joints. Take it slow on this section of the Creek Trail; remember, you are not racing Usain Bolt out here. Enjoy the stunning scenery of the Beartooth Range and pace yourself to prevent injury.
Day 8: Russell Lake to Marianne Lake (1.5 miles)
Day eight involves a quick 1.5-mile side trip off the main Beaten Path Trail. Your destination is Marianne Lake, a small but gorgeous lake tucked away from the primary route. To find it, follow the subtle trail near the bridge that crosses Russell Creek; it is always a good idea to check a reliable map, like a TerraTopo map of the Absaroka-Beartooth Wilderness, for the exact turnoff. This helps prevent any wrong turns, and good map reading skills are very useful for exploring side attractions in the Gallatin National Forest.
Marianne Lake is a true hidden gem, often missed by those rushing along the Beaten Path. It sees fewer anglers than some of the other, more accessible lakes along the route, like Rainbow Lake or Dewey Lake. The water here is crystal-clear, reflecting the surrounding peaks. Campsites are somewhat limited, so if you plan to stay, stake your claim early to get the best choice of spots. It is a wonderfully quiet place to spend a night, offering a different experience from a busy lake camp.
Fly Fishing at Marianne Lake
The Yellowstone cutthroat trout in Marianne Lake are typically less pressured. This often means they respond well to a good dry fly presentation. A Parachute Hopper in size #12 or #14 can be very effective, especially during late summer. A Stimulator, also size #12 or #14, is another excellent choice. These patterns mimic the grasshoppers and stoneflies that are common terrestrial insects in this part of the Beartooth Range.
For nymphing, a Beadhead Hare’s Ear, size #16, will get bites from cruising fish. A San Juan Worm, size #14, can also tempt fish in deeper water or after a rain shower has washed nutrients into the lake. Focus your fishing efforts near the inlet at the lake head; active trout often congregate here looking for food brought in by the current. The fishing here can be rewarding for those who make the short detour.
A Moment of Reflection at Marianne
Marianne Lake is a fantastic spot for a rest day if you find yourself ahead of schedule or simply wish to soak in profound solitude. You can sit by the water and enjoy the peace of this secluded corner of the national forest. You could even pretend you are in a Patagonia advertisement for a little while. It is a place that invites quiet contemplation and deep appreciation for the wilderness before you head east again towards the end of your trek.
Day 9: Marianne Lake to Kersey Lake and Exit (3.5 miles to trailhead)
Your final day on the trail takes you from Marianne Lake back to the main Beaten Path Trail along Russell Creek. From there, you will descend towards Kersey Lake. This leg is about 1.5 miles to the vicinity of Kersey Lake, which is quite scenic with views of distant peaks within the Beartooth Wilderness. However, the main trail does not go directly to its shores; you will enjoy the vistas from a bit above the lake. This is the last alpine lake you will formally pass on your 9-Day Backpacking Fly Fishing Adventure East Rosebud Trailhead to Kersey Lake before heading out towards the Clarks Fork Trailhead.
From the Kersey Lake area, it is a 2-mile descent. This final stretch of the fork trail takes you through a narrow canyon. You will also walk through forested sections before reaching the Clarks Fork Trailhead near Cooke City. This is where your shuttle vehicle, or your second car if you arranged a swap, should be waiting. The very last part of the trail follows along Russell Creek as it joins the Clarks Fork of the Yellowstone River, offering some peekaboo views of Yellowstone National Park’s distant peaks—a nice way to end the journey out of the Custer Gallatin National Forest. You might even spot signs for other trails like the West Fork trail if you explore the trailhead area.
Fly Fishing at Kersey Lake (If Time Allows)
If you find you have some extra time on your last day, consider making a short off-trail, possibly cross country, jaunt to Kersey Lake’s shores. Its Yellowstone cutthroat trout generally respond well to a Blue-Winged Olive. Try a size #16 or #18, especially if there is a hatch. A Royal Wulff, size #14, can also be a good choice during hatches when fishing the lake head or outlets.
For subsurface fishing, a Prince Nymph, size #14 or #16, is reliable. A Lightning Bug, size #16, can also tempt fish in the lake’s deeper pockets. If you do fish here at Kersey Lake, keep it quick. You have a shuttle to catch and a long drive ahead, most likely. But a few last casts can be a great way to say goodbye to the Beartooths and the beautiful creek lake systems you’ve explored.
Logistics Tip for Your Exit
Remember to arrange your shuttle service or a key swap well in advance. The East Rosebud Trailhead and Clarks Fork Trailhead are a significant distance apart. It is about a 3-hour drive one way, largely via the scenic Beartooth Highway (US 212), which itself is an amazing drive through the Beartooth Range, passing near features like Rock Lake or Island Lake turnoffs. Checking resources at local Forest Service offices might help you find information on shuttle services or forums where hikers arrange key swaps. Proper planning here is very important for a smooth end to your Beaten Path trip, concluding near Cooke City.
Best Fly Patterns for Your Absaroka-Beartooth Wilderness Trip
To help your fly box be well-stocked for this adventure through the Absaroka-Beartooth Wilderness, a part of the expansive Custer Gallatin National Forest, here is a list. These are some of the best fly patterns for this trek, based on typical local hatches and trout behavior, especially for targeting Yellowstone Cutthroat Trout in these alpine environments. Having the right flies can make a big difference in your success on waters like Rainbow Lake, Dewey Lake, or the numerous creeks like Rosebud Creek.
| Fly Type | Pattern Name | Suggested Sizes | Notes & Target Lakes/Creeks |
|---|---|---|---|
| Dry Flies | Parachute Adams | #14-16 | Versatile mayfly/midge imitation. Good for all lakes (Elk Lake, Fossil Lake). |
| Dry Flies | Elk Hair Caddis | #14-16 | Essential for caddis hatches. Effective at Rainbow Lake, Russell Lake, and Rosebud Creek. |
| Dry Flies | Royal Wulff | #14-16 | Classic attractor pattern. Good for Rimrock Lake, Kersey Lake. |
| Dry Flies | Parachute Hopper | #12-14 | Key for late summer. Excellent at Lake at Falls, Marianne Lake. |
| Dry Flies | Chernobyl Ant | #10-12 | Big, buggy attractor. A top choice for Dewey Lake. |
| Dry Flies | Blue-Winged Olive (BWO) | #16-18 | Great for overcast days/evening hatches. Produces on any Beartooth Wilderness lake. |
| Dry Flies | Stimulator | #12-14 | Mimics stoneflies/large hoppers. Effective for Marianne Lake, active waters. |
| Nymphs | Pheasant Tail Nymph | #16-18 | Classic mayfly nymph. Deadly at Elk Lake, Fossil Lake. |
| Nymphs | Hare’s Ear Nymph | #16-18 | Versatile, buggy nymph. Works well everywhere, especially Rimrock Lake. |
| Nymphs | Prince Nymph | #14-16 | Flashy and effective. Good for Rainbow Lake, Kersey Lake. |
| Nymphs | Copper John | #16 | Sinks fast for deeper water. Useful at Russell Lake, Dewey Lake. |
| Nymphs | Zebra Midge | #18-20 | Tiny but mighty for picky trout. Good at Rainbow Lakes, Russell Lake. |
| Nymphs | San Juan Worm | #14 | Effective, especially after rain. Try at Lake at Falls, Marianne Lake. |
| Nymphs | Lightning Bug | #16-18 | Flashy nymph that can trigger strikes. Good for Dewey Lake‘s active fish. |
| Streamers | Woolly Bugger (Black, Olive) | #8-10 | Great for swinging in East Rosebud Creek, or searching deeper lake water. |
| Streamers | Clouser Minnow | #8 | Good for aggressive trout. Try in Dewey Lake or Russell Lake. |
| Streamers | Bunny Leech | #8 | Big meal presentation. Cast near Rainbow Lake’s inlet in lower light. |
Fly Selection Wisdom
For most of these flies, pack sizes ranging from 12 to 20. However, a focus on sizes 14 and 16 will give you good versatility across the various waters encountered on the East Rosebud Trail to Clarks Fork Trail. Bringing a small, well-organized fly box with 5 or 6 of each key pattern helps keep your pack weight down. Try to match the hatch when you see insects active on the water, a common scenario on any lake trail in the Beartooth Range.
But, do not overthink it too much. Mountain trout, including the beautiful Yellowstone cutthroat, are often opportunistic feeders. They are not typically reading detailed fly fishing blogs about what they should eat while swimming in a remote glacier lake. A good presentation often matters more than the exact pattern.
Essential Gear and Packing Advice
Packing correctly for a 9-day trip into the Absaroka-Beartooth Wilderness is important for both comfort and safety. You need the right gear to handle the variable conditions of the Beartooth Mountains. Here are some thoughts on what to bring for your journey from the East Rosebud Trailhead.
Fly Fishing Equipment
A 4-weight or 5-weight, 9-foot fly rod is ideal for this environment. This setup works well for both the alpine lakes like Fossil Lake and the creeks like Rosebud Creek you will encounter. As mentioned earlier, a tenkara rod can also be a great, lightweight option for some of the smaller waters or for a minimalist approach. For your reel and line, a standard floating line will cover most fishing situations. Bringing a spare spool with a sink-tip line can be useful if you plan to fish streamers in deeper water at places like Dewey Lake, but it adds weight, so consider if you will really use it.
Backpacking Gear Staples
You will need a backpack with about 50 to 65 liters of capacity. This should be enough for a 9-day trip if you pack smart and choose lightweight gear. Brands like Osprey or Gregory make solid, reliable packs suitable for traversing the Beaten Path Trail. A lightweight, 2-person tent is recommended, giving you a bit of extra room and better protection if storms roll in over the Beartooth Range. Companies like Big Agnes or MSR offer good options. For your sleeping bag, aim for one with a 20°F temperature rating; nights in the Beartooths can get quite chilly, even in summer, especially at higher feet elevation campsites near Shelf Lake or Fossil Lake.
Bear Safety Items
Bear safety is not optional in this area of the Custer Gallatin National Forest. Carry bear spray and know how to use it effectively. A bear bag and rope, or a bear-resistant food canister, is essential for storing your food and scented items well away from your lake camp. And sometimes, simply making noise by talking or occasionally yelling “Hey, bear.” while hiking, particularly through dense vegetation along a creek trail, can help prevent surprise encounters. Be aware of your surroundings at all times in this prime grizzly habitat which extends from Yellowstone National Park.
Food and Water
For food, dehydrated meals are lightweight and convenient for a long trip. Pack plenty of high-energy snacks like trail mix, energy bars, and jerky to fuel your days on the East Rosebud Trail. You will need a reliable backpacking stove and fuel for cooking. Remember, campfires are not allowed at Fossil Lake and some other sensitive alpine areas as per Forest Service regulations. Water sources are generally plentiful along the trail from lakes and creeks like Russell Creek, but all water needs to be treated before drinking. Use a good water filter or water purification tablets to avoid waterborne illnesses.
Clothing System
Dress in layers to adapt to the mountains’ fickle weather. The weather in the Beartooth Wilderness can change rapidly; temperatures can swing from 30°F to 80°F in a single day. Pack good quality rain gear, both a jacket and pants. A warm hat and gloves are also important, even in summer, for cold evenings and mornings at high elevation gain spots. Moisture-wicking base layers are a must; avoid cotton clothing as it dries slowly and offers poor insulation when wet, which can be dangerous in the backcountry.
Navigation Tools
Always carry a map and compass, and know how to use them, even on a well-marked route like the Beaten Path. A specific map for the area, like the TerraTopo map (ISBN 0-9713501-0-8) covering the Absaroka-Beartooth Wilderness, is highly recommended. A GPS device or a smartphone app like Gaia GPS can also be very helpful for navigating to off-trail locations like a secluded Island Lake or confirming your position on the Rosebud Trail. Make sure your electronic devices are fully charged, and consider bringing a portable power bank for recharging.
Safety First and Practicing Leave No Trace
The Absaroka-Beartooth Wilderness is genuinely wild; this is not the “cute chipmunk eating from your hand” kind of wild. Grizzly bears, black bears, moose, and mountain goats all roam freely here. So, it is critical to stay alert and maintain situational awareness, especially when hiking near dense vegetation or along noisy creeks like Rosebud Creek. Keep a safe distance from all wildlife, and never, ever feed wild animals. For specific fishing licenses and current regulations within the Custer Gallatin National Forest, check with Montana Fish, Wildlife & Parks. Their website is a good resource for anglers heading to the Beartooth Range.
It is equally important to follow Leave No Trace principles strictly. Pack out absolutely all your trash, including food scraps and toilet paper. Camp at least 200 feet away from lakes and streams like Russell Creek to protect riparian areas. Do not carve your initials into trees or disturb natural features. Let us all work to keep this magnificent national forest pristine for future generations of hikers and anglers on the Beaten Path Trail and beyond. The Montana Wilderness Association also offers good information on responsible recreation in areas like the Gallatin National wilderness.
Conclusion of 9-Day Backpacking Fly Fishing East Rosebud to Kersey Lake Trek
A 9-Day Backpacking Fly Fishing Adventure East Rosebud Trailhead to Kersey Lake is far more than just a trip; it is a profound experience. It is like writing a love letter to the wilderness itself, exploring the heart of the Absaroka-Beartooth Wilderness. You will make stops at iconic lakes like Rainbow Lake, Lake at Falls, Dewey Lake, Fossil Lake, Russell Lake, and Marianne Lake. At each lake camp, you will have the chance to fish for wild Yellowstone cutthroat trout in some of the most stunning natural settings on Earth, from the start at East Rosebud Lake to the final glimpses of Kersey Lake.
With the right fly patterns in your box (Parachute Adams, Elk Hair Caddis, and Pheasant Tails are your trusted friends), a well-packed backpack, and a good sense of humor for when the mountain weather on the Beaten Path Trail inevitably turns a bit gnarly, you are set for an unforgettable adventure. This journey through the Custer Gallatin National Forest, a classic Rosebud Trail experience with significant elevation gain, will leave you with lasting memories. You’ll have great fish stories from Elk Lake to the Clarks Fork Trailhead, and maybe a few well-earned blisters.
So, lace up those hiking boots, check your gear one last time at the East Rosebud Trailhead, and tie on a fly. Get ready to make some incredible memories as you explore the fishing opportunities from Rosebud Creek to the remote alpine tarns of the Beartooth Range. Happy trails to you—and tight lines on your 9-Day Backpacking Fly Fishing Adventure East Rosebud Trailhead to Kersey Lake, a true immersion into the wild beauty near Yellowstone National Park.
