Blue Sky Trail Marathon

The Blue Sky Trail Marathon and Half Marathon, scheduled for October 18-19, 2025, takes place in Fort Collins, Colorado, featuring scenic trails between Horsetooth Mountain Park and Devil’s Backbone Open Space. Participants can choose between a 26.7-mile marathon with 3,500 feet of elevation gain and a 13.4-mile half marathon with 1,800 feet of elevation gain. The courses are primarily dirt trails, offering a mix of smooth paths and technical sections, appealing to both experienced and novice trail runners.

Post-race festivities include food and awards, making it a community-focused event. Visit the organization's website for the most recent information.