Hardrock 100

Silverton, United States • 10 Jul 2026

Hardrock Hundred Mile Endurance Run : overview

The Hardrock Hundred Mile Endurance Run is a 100-mile ultramarathon in the San Juan Mountains of southwestern Colorado. The course is a loop and alternates direction each year; 2026 is scheduled as a clockwise loop. Total elevation change is 66,394 feet (about 33,197 ft of ascent and 33,197 ft of descent) with an average elevation of 11,186 feet. The course low point is 7,680 feet at Ouray and the high point is 14,048 feet at Handies Peak.

Course, entry and community

The route uses 4WD roads, dirt trails, and cross-country sections and connects or passes near Silverton, Lake City, Ouray, Telluride, and Ophir. The event operates at least in part on public lands under permits from the U.S. Bureau of Land Management and the U.S. Forest Service. The 2026 lottery application window runs from October 1 to October 14, 2025, and the lottery will be held December 6, 2025. Certain 2025 race results may be accepted as qualifiers for the 2026 entry process and will be reviewed after those races.

The event organizes community programs including the Joel Zucker Memorial Scholarship. In 2025 the scholarship program awarded $47,000 to six high school and ten continuing-education students; the program is in its 26th year and has distributed $366,050 across 165 scholarships. Organizers also reported an incident during the 2025 event involving a participant fatality and noted that emergency responders and grief support were provided. Visit the organization's website for the most recent information.

Race information

100 mi
100 Miles
Visit the organization's website for the most recent information.
Trail runs nearby

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Run the Silverton Alpine Runs through the San Juan Mountains, an alpine loop that climbs past historic ghost towns and reaches California Pass near 13,000 feet. Pick a 50K, marathon, or 8 mile and tackle rugged high country trails.

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