Aspen Backcountry Marathon

Aspen, United States • 2 Aug 2025

The Aspen Backcountry Marathon, held in Aspen, Colorado, offers three trail running distances: a 50K ultra, a marathon, and a heavy half-marathon. The courses run almost entirely on dirt trails featuring diverse terrain with challenging ascents, descents, and significant elevation gain, peaking above 10,000 feet. The 50K includes an out-and-back to the McNamara Hut of the 10th Mountain Hut System. The race starts and finishes at Rio Grande Park, coinciding with the Rotary Club's Duck Derby festival, which features live music, food trucks, and family activities. Aid stations provide light refreshments, and participants must carry a CORSAR card for search and rescue support. Visit the organization's website for the most recent information.

Race information

50 km
50 Kilometer
26 mi
Marathon
13 mi
Heavy Half Marathon
Visit the organization's website for the most recent information.
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