Hardrock 100
Silverton, United States • 10 Jul 2026
Hardrock 100
The Hardrock Hundred Mile Endurance Run is an ultramarathon held in the San Juan Mountain Range of Southern Colorado. The event follows a loop course that utilizes dirt trails, 4WD roads, and cross-country sections. Participants navigate a route with a total elevation change of 66,394 feet, consisting of 33,197 feet of climbing and 33,197 feet of descent.
The course operates at a high altitude, maintaining an average elevation of over 11,000 feet. The lowest point of the run is located in Ouray at 7,680 feet, while the highest point reaches 14,048 feet at the summit of Handies Peak. Because of the mountainous environment, course conditions are significantly influenced by the annual snowpack levels in the San Juan Mountains.
The event starts and ends in Silverton, Colorado. Participation is managed through a lottery system, and runners must meet specific qualifying requirements to enter. The run also mandates a service requirement for entrants. The following distance is available:
- 100 miles (160 km)
The run takes place on public lands under permits from the U.S. Bureau of Land Management and the U.S. Forest Service. It traverses the ancestral homelands of the Puebloan, Ute, and Diné people. Visit the organization's website for the most recent information.