Cirque Series - Arapahoe Basin
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Arapahoe Basin - Cirque Series (Sept 5, 2026)
The event takes place at Arapahoe Basin, Colorado on Sept 5, 2026. The course is listed as 9.4 miles with 2,211 ft of vertical gain. The race is capped at 700 runners. The course uses approved established trails in the White River National Forest. There is a 30-minute cutoff at Black Mountain Lodge (Aid Station 1). Registration breakdowns on the page show Sport 67%, Expert 28%, and Pro 5%.
Course and event details
The start is at Mountain Goat Plaza at about 10,780 ft. Runners follow the A-Basin summer road and established trails through High Noon parking lot, Last Chance, Black Mountain Lodge, the top of Pali lift to Zuma Cornice, and the saddle near Montezuma Lift. The route includes the Lenawee trail to Little Lenawee summit, a turnaround, and a downhill that uses the Summer road, the new high-alpine "Half Moon Vista" trail, and the Argentine North Fork singletrack. The final mile is on a new mountain bike singletrack with high walls and finishes in Mountain Goat Plaza. Event features include a vendor village all day, live music and food at the finish, awards in the early afternoon, early bib pickup in Boulder at La Sportiva (2100 Broadway), and race day bib pickup at A-Basin. Competitor items listed include a snapback, giveaway ticket, logoed bib and medal, a sponsor swag bag, and professional race photos. Visit the organization's website for the most recent information.