Blue Sky Marathon
Race Day Weather
Cool start, warming up gradually
Runners will face a start temperature of 41°F, rising to a high of 67°F by race end. Winds will be light at 8 mph with variable directions, featuring headwinds from miles 5-12 and 15-16, which will challenge pacing. Given the cool temperatures, runners should stay hydrated and consider adjusting their pace during the climbs, especially from miles 2-4 and 21.
Pace Calculator
Get forecast alerts for Blue Sky Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Blue Sky Marathon is a 26.7-mile trail race in Fort Collins, Colorado, run on dirt trails between Horsetooth Mountain Park and Devil's Backbone Open Space along the Front Range foothills. The course has about 3,500 feet of elevation gain and loss, mostly singletrack with sections of rocky terrain and dirt road. First run in 2008, it is organized by Gnar Runners, which bills it as Fort Collins' original and only trail marathon. A half marathon (13.4 miles, 1,800 feet of gain) runs the following day over a shorter loop of the same terrain.
