The Hardrock Hundred Mile Endurance Run traverses the rugged San Juan Mountains of southwestern Colorado, with an average elevation of over 3,400 meters. The course includes 10,180 meters of cumulative climb over mountain passes above 3,900 meters. It is considered one of the most difficult 100-mile trail races in the world.
Date
Jul 17-18, 2026
Location
Silverton, USA
Sport
Running
Website