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Mountain bike trails Warm River Idaho are situated within the Caribou-Targhee National Forest, offering a diverse landscape for outdoor activities. The region features pine trees, willow-lined riverbanks, and rolling hills characteristic of a volcanic caldera terrain, with an elevation around 5,200 feet. Trails often utilize old roads and former rail lines, providing views of the Henry's Fork of the Snake River and glimpses of the Teton Mountain Range.
Last updated: May 10, 2026
83.4km
05:53
520m
520m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
121km
09:36
1,030m
1,030m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.

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40.2km
03:19
530m
530m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
57.1km
03:50
550m
550m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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Warm Creek Butte offers elevated views of the surrounding Targhee National Forest. There are bears in the area so call out for bears, ride with a friend, and bring bear spray!
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At Big Springs is a great place to turn around or take a dip in the river to cool off. This trail goes along the Great Divide route and is flat singletrack most of the way. This trail would be great for an easy ride, or a good place to get in some speed work training.
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Together with the lower falls Upper Mesa Falls are the final waterfalls on the Snake River that are unaffected by man-made dams and reservoirs. There's a Visitor Center located in the Historic Big Falls Inn where you can learn more about the history and geology of the falls.
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Getting to Lower Mesa Falls is via an easy, family friendly trail. However, the falls themselves are very exposed so care will need to be taken if venturing down to some viewpoints.
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Moose Lake is secluded in every sense of the word. Located in the middle of Grassy Lake Road on the outskirts of Grand Tetons & Yellowstone National Parks this area sees a sliver of the visitors that the two parks do. Dispersed campsites are available nearby, on a first come first served basis, if you fancy an overnight excursion.
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In the middle of the wilderness, the state line makes no difference in the chunky rough gravel road quality
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The Warm River area, nestled within the Caribou-Targhee National Forest, offers a diverse range of mountain biking experiences. You'll find trails that utilize old roads and former rail lines, traversing varied terrain from pine forests and willow-lined riverbanks to rolling hills characteristic of a volcanic caldera. The routes range from moderate to difficult, providing options for different skill levels.
Yes, Warm River offers several challenging routes. For experienced riders, the Great Divide Mountain Bike Route is a difficult 51.8-mile trail that takes nearly 6 hours to complete, featuring varied terrain including sections of old railroad lines. Another difficult option is the Great Divide Mountain Bike Route: Big Springs Loop, which is over 75 miles long with significant elevation changes.
Absolutely. Intermediate riders will enjoy trails like the Great Divide Mountain Bike Route: Ashton to Mesa Falls. This moderate 35.5-mile path offers scenic views and leads towards the impressive Mesa Falls. Another great option is the Warm River Butte Loop, a moderate 25-mile trail through rolling hills and forested areas.
Mountain biking in Warm River offers stunning natural scenery. Many trails provide glimpses of the majestic Teton Mountain Range. You can also expect to see the Henry's Fork of the Snake River, natural springs, and remnants of historic railroad lines and tunnels. The area is also close to the Mesa Falls Scenic Byway, which leads to the impressive Upper and Lower Mesa Falls.
While the trails themselves might not lead directly to waterfalls, the Warm River area is very close to the spectacular Mesa Falls. The Great Divide Mountain Bike Route: Ashton to Mesa Falls specifically leads towards this significant natural attraction, allowing you to combine your ride with a visit to the Upper and Lower Mesa Falls on the Henry's Fork of the Snake River.
The best time for mountain biking in Warm River is generally during the warmer months, from late spring through early fall. This period offers the most favorable weather conditions and ensures trails are clear of snow. Always check local trail conditions before heading out, as seasonal closures can occur.
While the routes listed in this guide are moderate to difficult, the broader Warm River area, including parts of the Caribou-Targhee National Forest, does offer easier sections. For a relatively easy ride, the Warm River Springs trail, a 1-mile dirt/gravel road, is a good option. The Ashton-Tetonia Trail, a 30-mile path, also offers a less technical experience suitable for families in sections.
Warm River is located within the Caribou-Targhee National Forest, which generally allows dogs on trails. However, specific rules and leash requirements can vary by trail or designated area. It's always best to check with the local Forest Service office for the most current regulations regarding pets on specific mountain bike trails to ensure a safe and compliant outing for you and your dog.
Parking availability varies by trailhead. Many trails in the Caribou-Targhee National Forest, including those utilizing old roads and rail lines, often have designated parking areas or pull-offs at trailheads. For specific routes, it's advisable to consult detailed trail maps or local resources for precise parking locations.
Mountain biking in the Caribou-Targhee National Forest typically does not require specific permits for day use on most trails. However, some areas, especially those with developed facilities or within specific recreation sites, might have day-use fees or require a recreation pass. It's always a good idea to check with the Caribou-Targhee National Forest Service for any current regulations or fee requirements before your visit.
The Warm River area has a rich history, particularly with its connection to the Oregon Short Line Railroad. Many trails utilize old railroad lines, allowing you to explore remnants of this past, including old tunnels and an old stone bridge from the original road to Yellowstone Park. You can learn more about the region's history at fremontcountyhistoricalsociety.org.
Public transportation options directly to the mountain bike trailheads in Warm River are generally limited. The area is quite rural, and most visitors rely on personal vehicles to access the trails. Planning for private transport is recommended for reaching your desired starting points.
Warm River itself is Idaho's least populous city, so options directly within the town are minimal. However, nearby towns like Ashton and Island Park offer a range of accommodations, cafes, pubs, and restaurants. These towns serve as excellent bases for exploring the Warm River area and are typically within a reasonable driving distance from the trailheads.


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