The Hardrock 100 is an annual ultramarathon held in the San Juan Mountains of Colorado. Covering a distance of 100.5 miles, the race features challenging terrain with significant elevation changes, including over 33,000 feet of ascent and descent. It typically takes place in July and attracts runners from around the world. Participants must navigate rugged trails, often at high altitudes, making it a test of endurance and skill. The race is known for its stunning scenery and remote location, with sections above 12,000 feet. The event is part of the Ultra-Trail World Tour and has a strong community of dedicated ultrarunners.