Blue Sky Trail Marathon

The Blue Sky Trail Marathon and Half Marathon are scheduled for October 18-19, 2025, in Fort Collins, Colorado. The event features a scenic course through trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space, offering a mix of dirt singletrack, rocky terrain, and gravel paths. The marathon covers approximately 26.7 miles with 3,500 feet of elevation change, while the half marathon is about 13.4 miles with 1,800 feet of elevation.

Designed for both seasoned trail runners and beginners, the race emphasizes a challenging yet accessible experience, with generous cut-offs, aid stations, and post-race festivities including food and sponsor giveaways. Visit the organization's website for the most recent information.