4.7
(9457)
9,458
hikers
07:47
25.9km
950m
Hiking
Embark on the Crater Ice Cave Trail, a difficult hike spanning 16.1 miles (25.9 km) with a significant elevation gain of 3123 feet (952 metres). This challenging route will take you around 7 hours and 46 minutes to complete. You will wind through a quiet Douglas fir forest before ascending…
Last updated: April 23, 2026
Tips
Your route passes through a protected area
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Waypoints
Way Types & Surfaces
Way Types
13.6 km
12.3 km
Surfaces
13.2 km
12.7 km
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Elevation
Highest point (2,680 m)
Lowest point (1,810 m)
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Wednesday 27 May
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This route was planned by komoot.
The trail begins somewhat primitively, initially following a gully. While the exact trailhead parking isn't detailed, it's located within the Pryor Mountains in the Custer Gallatin National Forest. Hikers should look for the start of the gully section which then leads to a more constructed trail bed.
The provided information does not specify whether dogs are allowed on the Crater Ice Cave Trail. It's always best to check the current regulations with the Custer Gallatin National Forest before bringing your dog.
The Crater Ice Cave Trail is particularly rewarding in late June or early July when the subalpine Big Pryor Mountain Plateau can be adorned with profuse wildflowers. The ice cave itself maintains ice year-round, offering a cool respite even in summer.
The information available does not mention specific permits or entrance fees for hiking the Crater Ice Cave Trail within the Custer Gallatin National Forest. However, it's always advisable to check the official Custer Gallatin National Forest website for the most current regulations before your visit.
The trail starts somewhat primitively, following a gully, before transitioning to an obvious, constructed trail bed. This section features about 14 switchbacks as it climbs steeply uphill. Inside the Crater Ice Cave, expect a year-round ice floor, which can be very slippery.
The primary attraction is the Crater Ice Cave itself, a natural wonder with intricate ice structures that remain frozen even in summer. As you ascend, the true scenic reward comes from the top of Big Pryor Mountain, offering expansive panoramic views of the Bighorn Mountains, Beartooths, and plains of Montana, and even the Wind River Mountains in Wyoming.
The Crater Ice Cave Trail is approximately 1.7 to 2 miles one-way. Given its substantial elevation gain, the average duration for the entire route is around 7 hours and 47 minutes, as it's considered a difficult hike.
Due to the steep ascent and the nature of the ice cave, you should bring sturdy hiking boots, plenty of water, and layers of clothing. If you plan to explore the Crater Ice Cave, a good flashlight or headlamp is essential, and caution is advised due to the slippery ice floor.
This trail is considered moderately difficult due to a substantial elevation gain of 1,302 to 1,600 feet over a relatively short distance. While rewarding, it might be challenging for younger children or those not accustomed to strenuous uphill climbs.
Yes, the route also passes through sections of the #2091, #2088, and Tie Flat Rd #2104 trails.
This is the only trail in the Pryors designated for motor-free hiking by Custer Gallatin National Forest, offering a quieter experience. Additionally, the year-round ice floor within the Crater Ice Cave is a rare natural phenomenon, providing a unique and refreshing environment even in summer.
The Crater Ice Cave is a significant feature, maintaining ice year-round. If you plan to explore inside, bring a good flashlight or headlamp as it will be dark. Be extremely cautious, as the ice floor can be very slippery, and temperatures are consistently cold.