Hiking the East Rosebud Trail to Rainbow Lake in the Beartooth Mountains, Montana
Distance: 17.1 miles / 27.5 km
With its countless glaciers, towering peaks, and lakes filled with trout fed by glacial streams and waterfalls, there are truly so many reasons to love the Absaroka Beartooth Range—which is, without a doubt, my favorite mountain range in the lower 48.
Furthermore, the East Rosebud Trail, also known as 'The Beaten Path,' is arguably the most scenic backpacking trip in Montana’s Beartooth Mountains!
That being said, since my friend and I didn’t have the time for the full thru-hike, this article is only about the East Rosebud Trail as far as Rainbow Lake.
My Print - Rainbow Lake
Rainbow Lake Trailhead Parking
Parking for the East Rosebud Trailhead is located at the very end of East Rosebud Road in Roscoe, Montana.
That being said, the last few miles on East Rosebud Road can be a bit long and bumpy on the dirt road to get there, but it should generally be passable for most 2WD vehicles, granted that the road is snow-free.
Google Maps Directions: East Rosebud Trailhead
Hiking Checklist - Beartooths
Obviously, for camping, you will need general backpacking gear. For this reason, I wrote a separate post about what backpacking gear is worth the money, from my experience, and what the best alternatives are to save you money.
Read My Separate Post: Best Ultralight Backpacking Gear
In addition, here is a complete list of must-have things that you will want for any hike in the Beartooth Mountains, including bear spray, as the Beartooth Range is both black and grizzly bear territory.
Hiking the Rainbow Lake Trail
Beginning from the East Rosebud Trailhead in the Custer-Gallatin National Forest, the hike begins up one of America’s newest federally protected rivers under the Wild and Scenic Act.
In any case, the hike up East Rosebud Creek to Rainbow Lake is about as stunning as a backcountry trip can be!
By this, I mean that the higher you hike up East Rosebud to Elk Lake and beyond, the more the canyon you’re in narrows until you’re surrounded by towering granite walls on both sides!
That being said, there are a number of stream crossings to navigate before Rimrock Lake, which can be tricky to keep your shoes dry—especially when the snowmelt is more significant in the early summer season.
Past Elk Lake, the East Rosebud Trail gains somewhere between 800-900 ft. (244-274 m) of elevation on the switchbacks leading up to Rimrock Lake.
It’s at this point that the canyon really starts to narrow, which, in my opinion, was the most beautiful section of the trail prior to Rainbow Lake.
My Print - East Rosebud Trail
Rimrock Lake
The East Rosebud Trail approaches Rimrock Lake on the left (east) side before descending and crossing over East Rosebud Creek at the mouth of the lake.
Then, past Rimrock Lake, the trail will gain roughly another 200 ft. (61 m), which will be the first time you get a view of Rainbow Lake at about 7.8 miles (12.6 km) into the hike.
Rainbow Lake
From the start of Rainbow Lake, it’s only another 0.8 miles (1.3 km) to reach the Rainbow Lake campsites, located at the far (south) end of the lake.
Rainbow Lake Campsite
In total, the East Rosebud Trail to the Rainbow Lake campsite is roughly 8.6 miles (13.8 km) each way.
That being said, make sure that you are aware of the current fire restrictions, as different areas of the Beartooths tend to follow different rules.
'The Beaten Path' to Clarks Fork
As previously mentioned, I only had the opportunity to hike as far as Rainbow Lake, but one of the coolest things about starting from the East Rosebud Trailhead is that you can thru-hike it all the way to the Beartooth Highway!
From Rainbow Lake, the East Rosebud Trail will climb to Lake at Falls, past a few more lakes until it reaches the 10,000 ft. (3,048 m) mark at Fossil Lake. Then, the trail begins descending down to the Beartooth Highway on the Russel Creek Trail, where the hike ends at the Clarks Fork Trailhead.
Overall, 'The Beaten Path' is a stunning 26-mile (41.8 km) one-way hike if you choose to thru-hike it from either East Rosebud or the Clarks Fork Trailhead.
However, the benefit of starting at the Clarks Fork Trailhead over East Rosebud is that you will only have to climb about 2,000 ft. (610 m) to the trail’s crest, whereas by hiking from the East Rosebud Trailhead, you will start lower and have to climb just under 4,000 ft. (1,219 m) to the trail’s crest at Fossil Lake.
All said, there are a variety of Beartooth shuttle services worth looking into, so that you can thru-hike 'The Beaten Path' and have a ride back to either trailhead.
AllTrails: 'The Beaten Path'
Additional Early Season Gear
Depending on the winter snowpack, upper-elevation areas can be covered in snow into the middle of July or even early August.
For this reason, micro-spikes may be a necessity across many upper-elevation areas throughout the Beartooths, like 'The Beaten Path.'
I personally use the Yaktrax below.
Safety
Always be mindful that the Beartooth Mountains and the surrounding area is grizzly bear country. Therefore, you need to be hiking with bear spray and know how to react in the event of a black or grizzly bear encounter.
Additionally, it’s also important to check the local forecast before you hike. Lightning strikes are not uncommon in mountain ranges at upper elevations, and I have personally been knocked to the ground from a strike that hit near me in the past.
Finally, know that when micro-spikes are necessary for an early-season adventure, micro-spikes are never supposed to be a substitute for conditions that require crampons.
