TrailAvalanche Peak Trailhead 5N2
4.5-mile out-and-back; 2,100 ft gain. Relentless climb with a true summit payoff.

A 5.5-mile winter ski loop through rolling terrain at Mammoth Hot Springs, rated easy to more difficult with 320 feet of elevation gain. Skier-tracked route delivers outstanding views of the Gallatin Mountains and Gardners Hole. Shuttle access from Mammoth Hotel is required; bison and elk frequent the trail, demanding wildlife awareness and safe distances.
Easy to Moderate
Outstanding winter mountain views with Gallatin Mountains and Gardners Hole visible from rolling sections. Reliable bison and elk sighting opportunity. Skier-tracked trail ensures navigable conditions in deep snow.
• The first mile (Indian Creek Loop section) is the easiest; the western loop is where the mountain views and elevation gain kick in • Book shuttle 2-3 days ahead on winter weekends; single-day availability is hit-or-miss • Ski between 7 AM and 2 PM; afternoon temperature swings and wind are brutal • Bison congregate in open meadow sections mid-trail; make noise constantly and photograph from 30+ yards • The 0.12-mile cut-off near Indian Creek Warming Hut shortens the route to ~5.3 miles if weather deteriorates
Winter (December through March)
Suitable for families with intermediate-to-advanced skiers (age 8+). Young children need winter ski experience due to rolling terrain and elevation gain. Shuttle logistics are family-friendly. Constant wildlife supervision required due to bison and elk presence. Snowshoeing is slower (3-4 hours) but accessible for non-skiers.
Winter skiers report reliable snow coverage, excellent mountain views, and manageable rolling terrain for intermediate-to-advanced skiers. Shuttle dependency adds logistical complexity but limits crowds. Wildlife presence is real—bison sightings are common. Winter conditions and hydrothermal hazards require preparation and respect.
No permits required for day use. Shuttle reservation serves as access authorization.
Ski shuttle operates from Mammoth Hot Springs Hotel. Reservations may be required. Contact Yellowstone Park hotels or call 307-344-7311 (Toll-free: 866-439-7375, TDD: 304-344-5395) to reserve. One-way or round-trip options available.
Federal regulations mandate 100-yard distance from bears/wolves, 25-yard distance from bison and elk. Hydrothermal areas have unstable, scalding ground—stay on designated trail. Winter conditions create avalanche risk on steep sections. Wind chill and snow blindness are real threats.
Skier-tracked easy-to-moderate trail over rolling terrain. Accessible only via ski or snowshoe. No paved, wheelchair, or mobility-device access. 320-foot elevation change requires intermediate fitness.
Suitable for families with intermediate-to-advanced skiers (age 8+). Young children need winter ski experience due to rolling terrain and elevation gain. Shuttle logistics are family-friendly. Constant wildlife supervision required due to bison and elk presence. Snowshoeing is slower (3-4 hours) but accessible for non-skiers.
Mammoth Hot Springs Hotel (shuttle origin, lodging, dining). Mammoth District Ranger Station. Indian Creek Campground (7 miles north, winter access limited). Mammoth Campground (year-round, full services in summer only).
Winter skiers report reliable snow coverage, excellent mountain views, and manageable rolling terrain for intermediate-to-advanced skiers. Shuttle dependency adds logistical complexity but limits crowds. Wildlife presence is real—bison sightings are common. Winter conditions and hydrothermal hazards require preparation and respect.
" Winter skiers report reliable snow coverage, excellent mountain views, and manageable rolling terrain for intermediate-to-advanced skiers. Shuttle dependency adds logistical complexity but limits crowds. Wildlife presence is real—bison sightings are common. Winter conditions and hydrothermal hazards require preparation and respect."
No. 'Easy to more difficult' means the route has easy sections, but rolling terrain and 320 feet of elevation require intermediate ski control and fitness. Beginner skiers should practice on flat terrain first.
Yes, but not recommended. Skier-tracked terrain is navigable alone, but wildlife hazards (bison, elk) are harder to manage without a partner. Bring a satellite communicator if going solo in winter.
Call 307-344-7311 to reserve ahead. If full, reschedule to a weekday. If weather cancels the shuttle, you cannot legally access the trailhead without it—don't attempt alternative access.
Carry 2+ liters. No potable water sources on trail. Do not drink unfiltered snow due to hydrothermal contamination in Yellowstone.
Stop. Stay 25+ yards away. Do NOT approach for photos. Back away slowly if they approach. Bison can run 30+ mph. Violating wildlife distance laws results in fines and injury.
Yes. Snowshoeing is fully allowed and takes 3-4 hours. Same shuttle, same wildlife rules, same hazards. Slower but accessible for non-skiers.
No. Winter only—December through March typically, depending on snow. Call the park to confirm current conditions before planning a trip.
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