Hidden Lake Trail is a roughly 8-mile out-and-back foot trail in North Cascades National Park, Washington. Difficulty: strenuous, from Trailbound's popular-hike list. That is the full hike: the mapped trail line covers only 0.46 mi of it, so don't plan from the map line alone.
Open Hidden Lake Trail on Trailbound's interactive map to see the full route, the elevation profile, today's forecast and any park alerts for North Cascades. North Cascades has permits or reservations for some areas: see the North Cascades page for what's needed.