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Four Pass Loop is a popular and beautiful backpacking trip located in the Maroon Bells/Snowmass Wilderness area of the Rocky Mountains in Colorado. Its name comes from the fact that it goes over four mountain passes. The four passes are the West Maroon at 12,500 ft., Frigid Air at 12,415 ft., Trail Rider at 12,420 ft., and Buckskin at 12,500 ft. The variety of terrain encompasses scenic forests, mid to late summer wildflowers, and challenging river crossings. The trail also provides spectacular views of the Maroon Bells and numerous other peaks of the Elk Mountain Range. The loop is 23.4 miles, though the total trip length varies based upon your entry point. The most popular entry for the loop trail is from Maroon Lake which results in about a 27 mile trip.