Logo

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 15,000 feet of elevation gain across forest trails and mountain roads, including steep climbs like Powerline and technical sections on the Colorado Trail. With 11 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 Registration
100 mi
100-Mile Run
Visit the organization's website for the most recent information.
Trail runs nearby

Cirque Series - Arapahoe Basin

Keystone - 30 mi from Leadville

The Cirque Series race at Arapahoe Basin, Colorado, is a challenging 9.2-mile trail run with 2,411 feet of vertical gain, set in the scenic White River National Forest. Starting at 10,780 feet at Mountain Goat Plaza, the course ascends through diverse terrain including summer roads, singletrack hiki..

Breckenridge Oktoberfest 5K

Breckenridge - 21 mi from Leadville

The Breckenridge Oktoberfest 5K will take place in Breckenridge from Friday 12 September 2025 to Sunday 14 September 2025. You can run 5 kilometers.

West Line Winder

Buena Vista - 30 mi from Leadville

The West Line Winder is a scenic trail running event held in Buena Vista, Colorado, featuring two race distances: a 50K (30.6 miles) with 4,000 feet of ascent and a 30K (18.1 miles) with 2,080 feet of ascent. The courses traverse buttery singletrack trails, forest roads, and some paved sections, set..

Golden Leaf Half Marathon

Aspen - 28 mi from Leadville

The Golden Leaf Half Marathon is a scenic running event held annually in late September, starting at Fanny Hill in Snowmass and finishing at Koch Lumber Park in downtown Aspen, Colorado. The course follows the Government Trail, winding through beautiful Aspen groves, offering runners a picturesque a..

14er Fest 14K

Buena Vista - 30 mi from Leadville

The 14er Fest 14K is a unique trail race held in Buena Vista, Colorado, in the heart of the Rocky Mountains. Covering 8.7 miles with over 500 feet of elevation gain, the course offers stunning views of the Collegiate Peaks, Arkansas River, and Buena Vista town. Runners start in the vendor village, t..

Rubey Rescue Run

Aspen - 28 mi from Leadville

The Rubey Rescue Run is a 5K uphill trail race held annually in Aspen, Colorado, on Buttermilk Mountain. Participants start near the Buttermilk Mountain Lodge and ascend 1,700 feet to the Cliff House, finishing with breathtaking views of the Maroon Bells. The event welcomes runners with or without t..