Lamar River Trail is a 30.74-mile out-and-back foot trail in Yellowstone National Park, Wyoming. It climbs 1,110 ft to a high point of 7,324 ft. Difficulty: very strenuous, from the NPS hiking-rating formula.
Open Lamar River 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.