Cirque Series - Arapahoe Basin
The Cirque Series at Arapahoe Basin, Colorado, is a challenging mountain trail race held on September 6, 2025. Covering approximately 9.4 miles with 2,411 feet of vertical gain, the course starts at 10,780 feet at Mountain Goat Plaza and ascends through scenic trails including the A-Basin summer road, Black Mountain Lodge, Zuma Cornice, and Little Lenawee peak. Runners experience world-class alpine views and technical singletrack descents like Half Moon Vista and Argentine North Fork trail, finishing back at Mountain Goat Plaza with live music and food.
The race is capped at 650 participants and offers divisions for Sport, Expert, and Pro runners, with prizes and season awards. Hydration stations and safety measures are provided throughout the course. Visit the organization's website for the most recent information.
Always double-check with the organizer's website – things can change, and we might have sprinted past a few details!
