Boulder Lake Trail is a 5.48-mile out-and-back foot trail in Olympic National Park, Washington. It climbs 1,942 ft to a high point of 4,339 ft. Difficulty: strenuous, from the NPS hiking-rating formula.

Open Boulder Lake Trail on Trailbound's interactive map to see the full route, the elevation profile, today's forecast and any park alerts for Olympic. Olympic has permits or reservations for some areas: see the Olympic page for what's needed.