Mary Mountain-Nez Perce Trail is a 40.24-mile out-and-back foot trail in Yellowstone National Park, Wyoming. It climbs 930 ft to a high point of 8,283 ft. Difficulty: very strenuous, from the NPS hiking-rating formula.
Open Mary Mountain-Nez Perce Trail on Trailbound's interactive map to see the full route, the elevation profile, today's forecast and any park alerts for Yellowstone. Yellowstone has permits or reservations for some areas: see the Yellowstone page for what's needed.