South Boundary Trail: Bechler RS-Grassy Lake Road is a 13.7-mile out-and-back foot trail in Yellowstone National Park, Wyoming. It climbs 598 ft to a high point of 6,501 ft. Difficulty: strenuous, from the NPS hiking-rating formula.
Open South Boundary Trail: Bechler RS-Grassy Lake Road 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.