West Maroon Pass Trail is a premier hiking destination in Aspen, Colorado, covering 8.0 miles with 2200ft of elevation gain. Stats: 8.0 miles, 2200ft gain, Hard. Type: Out-and-Back. Surface: Dirt/Rock. Time: 5-6 hours. Fee: Free (Maroon Lake shuttle). Dogs: Yes. Permit: No. Wildlife: elk, mule deer, black bears, marmots, pikas, golden eagles, ptarmigan. Best seasons: July through mid-September; the wildflower display in Maroon Bells basin is among Colorado's finest. West Maroon Pass at 12,500 feet is the high route between Aspen and Crested Butte — one of Colorado's most classic alpine crossings. The Maroon Bells views on the Aspen side are simply unmatched. Pack plenty of water — desert and high-altitude trails demand more hydration than you expect. Layers are essential above 10,000 feet. Leave No Trace: stay on designated trails, pack out all waste, and respect wildlife and other visitors.