The Upper Black Boxes can be deadly and should only be attempted by experienced hikers. This route includes miles of wading and swimming through San Rafael River gorge with walls 400 feet high and 25 feet wide in places
Upper Black Box Trailhead is primarily first-come, first-served. Use the availability view to gauge how busy it is before you go.
See the map for Upper Black Box Trailhead's exact location and directions.
Pick your dates on the availability calendar, then reserve through the official booking link. You can also set an alert and we'll notify you if a sold-out date opens up.