Leadville Trail 100 Mile Run

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 climbing to a peak elevation of 12,600 feet at Hope Pass. The route features rugged forest trails, steep climbs, and over 15,700 feet of elevation gain. With 11 aid stations and strict cutoff times, the race tests endurance, grit, and determination.

Finishers under 30 hours earn a coveted belt buckle, making it one of the most iconic and demanding endurance events worldwide. Visit the organization's website for the most recent information.