Sepulcher Mountain

Overview

Sepulcher Mountain (9,642 ft) rises between Electric Peak and Mammoth Hot Springs, crowned with quirky volcanic rock that looks like grave markers—hence the name. It’s a big, rewarding day out: long, steep, and exposed in places, with sweeping views and excellent chances to see wildlife.

The Hike at a Glance

• Distance/elevation: roughly 11–13 miles with 3,200–3,800 feet of climbing; plan on 7–9 hours depending on fitness and conditions.
• Trailheads: Start near Mammoth Terraces at the Sepulcher/Beaver Ponds sign, or begin at the quieter Glen Creek Trailhead (about 5 miles south of Mammoth, across from Bunsen Peak). Both connect into the same loop.

Route Choices: Clockwise vs. Counterclockwise

• Counterclockwise from Mammoth: a stout early climb delivers up-close looks at the summit’s “sepulcher-like” rock and big ridge panoramas, then a more gradual descent toward Glen Creek and Snow Pass.
• Clockwise: the ascent is more moderate, with the steeper bits saved for the end.

What You’ll See

Expect a sampler of Yellowstone uplands: lodgepole forest, open sagebrush slopes, burn areas, grasslands, and occasional volcanic boulder fields. The summit and upper ridges open to grand views of Gardiner, the Gallatin Mountains, Swan Lake Flat, and Electric Peak. In season, you’ll catch alpine wildflowers; lingering snow is possible near the top early or late.

Wildlife

This loop is known for wildlife. Elk are common in the meadows; hikers occasionally see mountain goats or bighorn sheep in rocky sections, plus moose and both black and grizzly bears. Make noise in timbered areas, carry bear spray and know how to use it, hike in a group when you can, and give all animals space—at least 100 yards from bears and wolves, 25 yards from everything else.

Conditions, Hazards, and Water

• Exposure and footing: Long, sustained climbs with switchbacks; some sections have loose rock and steep descents. Wind can topple dead trees in forested patches.
• Weather: It changes fast at elevation—thunderstorms, rain, and hail are all on the table. Start early and keep an eye on the sky, especially on exposed ridgelines.
• Water: After snowmelt, reliable water is scarce until you reach Glen Creek on the loop. Carry plenty; a filter is smart if you plan to refill at the creek.
• Navigation: Bring a good map and know your route.

Logistics

• Parking: The small lot by Mammoth Terraces serving the Sepulcher/Beaver Ponds start can be busy; arrive early or be ready to park elsewhere in Mammoth.
• Restrooms: The trailhead page doesn’t list toilets; use facilities in the Mammoth Hot Springs developed area before you begin.

Best Time to Visit

Go when the route is largely snow-free and start early for cooler temps, steadier footing, and better odds of a parking spot. Weekdays see fewer people. For photos, morning or late afternoon light flatters the meadows and the summit views, and it helps you dodge typical afternoon storms.