Cirque Series - Arapahoe Basin

The Cirque Series - Arapahoe Basin is a challenging mountain running event set for September 6, 2025, in Keystone, Colorado. Participants will tackle a 9.4-mile course with an elevation gain of 2,411 feet, starting at 10,780 feet. The race features three divisions: Sport, Expert, and Pro, catering to various skill levels.

Runners will experience stunning views as they navigate established trails in the White River National Forest, culminating in a festive finish at Mountain Goat Plaza with live music and food. The event is capped at 650 runners, emphasizing safety and environmental respect throughout the race. Visit the organization's website for the most recent information.