Leadville Trail 100 Mile Run
Leadville, United States • 22-23 Aug 2026
Leadville Trail 100 Mile Run
The Leadville Trail 100 Mile Run is a 100 mile out and back ultramarathon held in Leadville, Colorado on August 22, 2026. The course crosses high alpine terrain in the Colorado Rockies, with a reported total distance near 99.7 miles and about 15,492 feet of elevation gain. Course elevations range from roughly 9,200 feet to just over 12,500 feet at Hope Pass.
The route follows forest trails and some mountain roads and includes named sections such as Powerline, Sugarloaf, and parts of the Colorado Trail. The course is described as technical in places. There are 11 aid stations spaced along the route. Aid station supplies include water, energy gels and high carbohydrate drink mix from Neversecond, Skratch Labs hydration products, bars, chews, and assorted foods such as bananas, pretzels, chips, and cola products.
Pacers are permitted beginning at Twin Lakes inbound near mile 61.8. Crewing is allowed only at designated locations; crews and pacers must follow the event access rules and wristband requirements. Minimum participation age is 18 on race day. Entry options include a lottery that was open in December 2025 with results announced in January 2026, and the published entry fee is $495.
An outdoor Race Across the Sky Expo in downtown Leadville is open to the public and includes packet pickup, vendor booths, bike demos, podcasts, and beer tents. Volunteers and medical volunteers are listed as part of event operations. Visit the organization's website for the most recent information.