Blue Sky Marathon
Race Day Weather
Cool start, warming up late
Runners will face a temperature increase from 41°F at the start to a peak of 67°F, with low humidity at 39%. Wind will generally be mild at 8 mph, with notable headwinds between miles 5-12 and 15-19, making those stretches particularly challenging. Hydration should be prioritized, especially as temperatures rise, and pacing should be conservative during the climbs to manage energy effectively.
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 in Fort Collins, Colorado, offers runners a challenging 26.2-mile course through the picturesque Front Range mountains. Starting at the Blue Sky Trailhead in Horsetooth Mountain Park, the route features approximately 3,500 feet of elevation gain and loss, traversing a variety of terrains including smooth dirt trails, technical rock gardens, and distinctive redstone hardpack. With generous time allowances and a supportive community, this race caters to both seasoned trail runners and those new to the sport.
