Hardrock 100 Endurance Run

Test your mettle with the Hardrock Hundred Mile Endurance Run, an ultramarathon of 100 miles set in the San Juan Range of Southern Colorado, USA. You'll face 33,050 feet of climb and 33,050 feet of descent for a total elevation change of 66,100 feet, all at an average elevation of over 11,000 feet. This extreme loop course features 4WD roads, dirt trails, and cross country, and will test not only your endurance, but your mountaineering, wilderness survival, and wilderness navigation skills.