Weminuche Wilderness Chicago Basin is a premier hiking destination in Durango, Colorado, covering 16.0 miles with 5200ft of elevation gain. Stats: 16.0 miles, 5200ft gain, Hard. Type: Out-and-Back. Surface: Dirt/Rock. Time: 2-3 days. Fee: Free (train access). Dogs: Yes. Permit: No. Wildlife: elk, mule deer, black bears, mountain goats, marmots, pikas, golden eagles. Best seasons: July through mid-September only; accessed by Durango & Silverton Narrow Gauge Railroad — no road access. Chicago Basin in the Weminuche Wilderness is Colorado's premier multi-peak backpacking destination — three 14,000-foot summits (Windom, Sunlight, Eolus) surrounded by the most remote terrain in the state, accessible only by train. 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.