Blue Sky Trail Marathon

OCT
17-18
2026
Trail marathon and half marathon near Fort Collins featuring redstone singletrack, significant elevation change, fully stocked aid stations, and a finish line meal.
17-18 Oct 2026
27 miles 14 miles

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Blue Sky Trail Marathon & Half Marathon

Blue Sky Trail Marathon and Half take place on trails between Horsetooth Mountain Park and the Devil's Backbone Open Space near Fort Collins, Colorado. The courses follow the easternmost hogbacks of the northern Front Range and use the distinctive redstone hardpack of the Blue Sky Trail.

  • 26.7 miles with 3,500 ft total elevation gain and loss
  • 13.4 miles with 1,800 ft total elevation gain and loss

The routes are 100% dirt and about 90% singletrack, with terrain that ranges from smooth dirt trail to technical rock gardens. Small sections run on smooth dirt road and gravel bike path. The marathon includes long ridge and loop sections with exposed, rocky terrain on the Devil's Backbone portion.

Race support includes fully stocked aid stations offering sports drink, gels, water, soda, fruit and both salty and sweet food options, with gluten free and vegan alternatives held for those who need them. Finish line fare includes a meal and barbecue style options. Participants receive a gender specific race T shirt and finisher and age group awards. Professional medical and emergency communications are provided.

Logistics and rules: field limits are 400 entries per distance, drop bags are allowed at designated locations and must be labeled, courses are well marked with flagging and flour, pacers are not allowed, crewing is restricted to designated locations, and dogs are not permitted on course. The marathon time allowance is nine hours and the half marathon allowance is six hours. Visit the organization's website for the most recent information.

27 mi
Blue Sky Trail Marathon
14 mi
Blue Sky Trail Half Marathon
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