
Hardrock Hundred Mile Endurance Run
The Hardrock Hundred Mile Endurance Run is a premier 100-mile ultramarathon in the San Juan Mountains, known for its extreme elevation change and technical high-altitude terrain. Course Highlights The Hardrock Hundred Mile Endurance Run is legendary for its challenging and breathtaking course through the San Juan Mountains in southwestern Colorado. The 2026 edition will follow a clockwise loop, starting and ending in the historic mining town of Silverton. Runners will encounter thirteen major passes in the 12,000' to 13,000' range, […]
























