TrailAvalanche Peak Trailhead 5N2
4.5-mile out-and-back; 2,100 ft gain. Relentless climb with a true summit payoff.
Mammoth Hot Springs
An 11-mile alpine loop climb gaining 3,400 feet to the 9,652-foot summit of Sepulcher Mountain. This is serious terrain: strenuous, navigation-dependent, and grizzly country that demands fitness and map skills. Summit payoff includes alpine meadows, views of the surrounding ranges, and frequent wildlife encounters (mountain goats, bighorn sheep, moose). Expect 6-8 hours of steady climbing through forest and meadow before breaking into open alpine slopes.
Strenuous
Summit views of the northern range, close wildlife encounters, alpine terrain
• The "false summit" at around mile 8 will trick you—the true peak is another 0.3 miles further with similar elevation. Keep going. • Snow passes (check the north slope of the mountain) often hold snow into mid-July—expect slippery descents even in summer • The open slope descent (right side of the loop) is faster but riskier—many hikers prefer backtracking the ascent route • Evening light on the northern range from the summit is spectacular; plan your descent timing accordingly • Bighorn sheep often hang on the rocky upper slopes—binoculars reveal them before they flee
Summer and Fall
Not suitable for young children under 12. Requires solid hiking fitness, map navigation ability, and wilderness awareness. Older teenagers with backcountry experience and strong adult supervision can manage. Younger kids risk altitude sickness, navigation disorientation, and grizzly encounter stress.
Hikers consistently report the elevation gain and navigation challenge as the trail's defining difficulty—this isn't a leg-warmer stroll. Those who summit praise the solitude, wildlife encounters, and expansive alpine views. The descent is where most injuries occur; respect the scree and use poles.
No permit required, but check the Backcountry Situation Report at nps.gov/yell/planyourvisit/situationreport.htm before heading out
Not required
Grizzly bears frequent this area—make noise constantly. Steep scree descent taxing on joints. Altitude can trigger headaches; ascend slowly. Summit and upper slopes fully exposed to sun, wind, and lightning. Navigation is challenging—many hikers miss junctions without a map.
Steep, rocky, and rooty throughout. Not accessible to mobility-limited hikers. Loose scree descent punishing. Trekking poles essential.
Not suitable for young children under 12. Requires solid hiking fitness, map navigation ability, and wilderness awareness. Older teenagers with backcountry experience and strong adult supervision can manage. Younger kids risk altitude sickness, navigation disorientation, and grizzly encounter stress.
Hikers consistently report the elevation gain and navigation challenge as the trail's defining difficulty—this isn't a leg-warmer stroll. Those who summit praise the solitude, wildlife encounters, and expansive alpine views. The descent is where most injuries occur; respect the scree and use poles.
" Hikers consistently report the elevation gain and navigation challenge as the trail's defining difficulty—this isn't a leg-warmer stroll. Those who summit praise the solitude, wildlife encounters, and expansive alpine views. The descent is where most injuries occur; respect the scree and use poles."
Yes. Grizzlies frequent this area. Make constant noise, travel in groups if possible, and carry bear spray. Check the Situation Report before going.
Likely, without a map. The trail has many unsigned junctions and the route isn't obvious in some meadow sections. Bring a detailed Yellowstone map and compass. GPS helps but isn't reliable here.
If you've hiked less than 8 miles with 2,000+ feet gain recently, yes—this will be painful. If that's normal for you, this is challenging but doable. Train first; don't test yourself here.
Before 7 AM. You want to summit by early afternoon and descend before dark. Afternoon thunderstorms hit fast at altitude; finishing descent by 4 PM is critical.
Trekking poles, detailed map, compass, and bear spray are essential—not optional. Three liters of water minimum. Sun protection (hat, sunscreen) and layers (weather changes fast).
Yes, but barely. 6-8 hours of hiking plus navigation stops means 8-10 hours minimum on the trail. Leave before 7 AM, don't linger at the summit, and accept that you'll be hiking the descent in fading light if anything goes wrong.
Mountain goats, bighorn sheep, and moose are common. Grizzly bears use this area. Expect to see tracks and scat. Stay alert, make noise, and maintain distance from all wildlife.
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