🥾 Trail

Sepulcher Mountain Trail

Mammoth Hot Springs

Trails
Last Updated: June 2026

Distance

11 mi

Elevation Gain

3,400 ft

Est. Time

6-8 hours if fit; up to 10 hours with navigation delays

Route Type

Loop

Dogs Allowed

No

Best Season

Summer and Fall

Overview

About This Trail

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.

Highlights

Difficulty Level

Strenuous

Trail Highlights

Summit views of the northern range, close wildlife encounters, alpine terrain

Insider Tips

• 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

Best Season to Hike

Summer and Fall

Hiking Tips

  • Carry minimum 3 liters of water and electrolytes—high altitude and sun exposure dehydrate fast
  • Make constant noise (bear bell, talking) to avoid surprising grizzlies
  • Pack the detailed park map and a compass—trail junctions are not well marked
  • Tighten your boots—loose rock and scree on descent will punish your ankles
  • Bring trekking poles to absorb the 3,400 feet of descent impact
  • Start before 7 AM to allow buffer time for navigation and weather changes

Family Info

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.

What Hikers Say

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.

ℹ️ Data Sources
🏞️ National Park Service 📝 YourNPGuide Editorial

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