Boundary Lake Spur is a 1.26-mile out-and-back foot trail in Yosemite National Park, California. It climbs 204 ft to a high point of 7,538 ft. Difficulty: easy, from the NPS hiking-rating formula.
Open Boundary Lake Spur on Trailbound's interactive map to see the full route, the elevation profile, today's forecast and any park alerts for Yosemite. Yosemite has permits or reservations for some areas: see the Yosemite page for what's needed.