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Leadville Trail 100 Mile Run

Leadville, United States • 16-17 Aug 2025

The Leadville Trail 100 Mile Run, held annually in Leadville, Colorado, is a legendary ultramarathon known as the "Race Across the Sky." Established in 1983, this grueling 100-mile out-and-back course challenges runners with extreme Rocky Mountain terrain, starting at 10,200 feet and reaching a peak elevation of 12,600 feet at Hope Pass. The course features over 15,700 feet of elevation gain across forest trails and mountain roads, including steep climbs like Powerline and technical sections on the Colorado Trail. With 10 aid stations and strict cutoff times, the event tests endurance, grit, and determination. Finishers under 30 hours earn a coveted belt buckle, making it a prestigious race in the ultrarunning community. Visit the organization's website for the most recent information.

United States Colorado Leadville

Race information

Website
100 mi
15744 m+
100 Miles
Visit the organization's website for the most recent information.
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