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

Events nearby

Timed 6, 12 and 24 hour individual and relay events on a flat USATF certified one mile dirt loop at Swift Ponds in Fort Collins with full aid and lodge access.
A fall trail event in Loveland, Colorado offering a just over 15K loop and a 5K course with climbs, technical terrain, and varied footing.
An ultramarathon on the Poudre River Trail through Fort Collins, Timnath, Windsor and Greeley offering 50 mile and 100 mile individual races plus relay team options.
Trail races near Fort Collins offering 25 miles (≈5,500 ft gain) and 50 miles (≈11,000 ft gain) on mostly singletrack with staffed aid stations.
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