Sepulcher Mountain Trail

This is an approximately 11.5-mile loop from Mammoth Hot Springs to Sepulcher Mountain’s 9,652-foot summit and back. The mapped route climbs through forest and meadows, crosses the high open slope on the far side of the summit toward Snow Pass, then returns through the Mammoth trail network. Published descriptions put the outing between about 11 and 13 miles; 11.5 miles is the measured length of this connected route, so use it as a planning estimate rather than an exact trail sign distance.

Expect roughly 3,400 feet of climbing and about 6–8 hours on the trail. The steep ascent, long descent and altitude above 9,600 feet make this a strenuous hike. The loop passes several junctions, and the route is not a marked summit path at every decision point. Carry a good map and make sure it shows the return toward Snow Pass before leaving the summit area.

The climb starts near Liberty Cap and gains elevation through forest and open meadows. Higher up, the route reaches a more exposed plateau and saddle before the final steep push. A few volcanic-tuff bluffs and distinctive rock formations appear near the upper mountain; allow time for the changing terrain rather than treating the summit as a quick stop.

The loop continues down the opposite side of the mountain across open slopes toward Snow Pass. This descent is steep in places, with switchbacks through more open, sagebrush-covered ground. From the Snow Pass junction, connected trails lead back toward Mammoth and the Liberty Cap trailhead. Keep track of junctions on this longer return; the summit is only one part of the circuit.

Near the top, look across Gardiner Basin toward Electric Peak and the Gallatin Range. The summit’s tall, headstone-like rock formations are the feature behind the name Sepulcher. The view over the basin and surrounding ridges is the main payoff for the sustained climb.

Start at Sepulcher Mountain Trailhead (1K1), north of Liberty Cap near the stone house. Its parking area is popular in summer, and visitors may need to park elsewhere in Mammoth. Pets are not allowed on the route. No separate activity fee or reservation is listed, though Yellowstone entrance fees may apply. The shorter Beaver Ponds loop shares this access area if you want a substantially easier outing.