About This Event

The Leadville Trail 100 Mile Run is a historic high‑altitude ultramarathon based in Leadville, Colorado, that starts and finishes in the mountain town and traverses rugged mountain trails and forest paths. The course rises above 12,600 feet and features steep climbs and technical terrain, making completion a widely recognized benchmark in the sport. Founded to support the local community, the race draws runners, pacers, and supporters who fill Leadville’s streets and surrounding trails each race weekend.