Logo

Aspen Backcountry Marathon

Aspen, United States • 2 Aug 2025

The Aspen Backcountry Marathon, held in Aspen, Colorado, offers three challenging trail running distances: a 50K ultra, a marathon, and a heavy half-marathon. The courses run almost entirely on dirt trails with significant elevation gains, peaking above 10,000 feet, providing runners with stunning views of the Elk Mountains and Aspen city. The 50K includes an out-and-back to the McNamara Hut, part of the 10th Mountain Hut System. The race starts and finishes at Rio Grande Park, coinciding with the Rotary Club's Duck Derby festival, featuring live music, food trucks, and family activities. The event emphasizes self-sufficiency with limited aid stations and requires a Colorado Outdoor Recreation Search and Rescue (CORSAR) card for participation. Visit the organization's website for the most recent information.

United States Colorado Aspen

Race information

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

Mt Sopris Run-off

Carbondale - 25 mi from Aspen

The Mt Sopris Run-Off is an exciting trail running event held in Carbondale, CO, featuring two race distances: 10 miles and 25k. Scheduled for May 18, 2025, the race takes participants along the scenic "Up & Over" single track trail, starting at Flying Dog Ranch and finishing at Rock Bottom Ranch. T..

Leadville Turquoise Lake 20K

Leadville - 28 mi from Aspen

The Leadville Turquoise Lake 20K is a scenic running event set around the picturesque Turquoise Lake in Leadville, Colorado. Participants will experience breathtaking mountain views as they navigate a course that combines 6.5 miles of hilly paved roads with 5.5 miles of single-track dirt trails. The..

Fish Hatchery 5K Trail Run

Leadville - 28 mi from Aspen

The Fish Hatchery 5K Trail Run is an exciting running event set in the picturesque surroundings of the Leadville National Fish Hatchery in Colorado. Participants will enjoy a scenic cross-country course that meanders through subalpine forests and alongside the Evergreen Lakes and lower Rock Creek ar..

Leadville Trail Marathon and Heavy Half

Leadville - 28 mi from Aspen

The Leadville Trail Marathon and Heavy Half is a challenging running event held in the historic mining district of Leadville, Colorado. Participants can choose between a 26.4-mile marathon or a 15.4-mile Heavy Half, both featuring breathtaking views and high-altitude trails, with the marathon reachi..

Grin & Bear It

Crested Butte - 24 mi from Aspen

The Grin & Bear It is Crested Butte’s oldest trail running event, featuring a 15 km out-and-back race and a new 25 km loop, both starting and ending at the Crested Butte Nordic Center. The event takes place in July and offers scenic routes through mountain trails with significant elevation changes,..

Leadville Silver Rush 50M

Leadville - 28 mi from Aspen

The Leadville Silver Rush 50M is a challenging 50-mile trail run that tests participants' endurance and grit against the stunning backdrop of the Rocky Mountains. The course features approximately 8,000 feet of elevation gain, taking runners through historic mining districts and offering breathtakin..