Welcome to the 14th running of the Blue Sky Marathon, Fort Collins’ original and only trail marathon.

Taking place on the trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space, the course takes you on a north-south tour of the easternmost hogbacks of Northern Colorado’s mighty Front Range. With 3,500 feet of elevation gain and an equal amount of elevation loss, the route offers a little bit of something for everyone. It is designed to appeal to both veteran trail runners and those looking to experience their first trail racing adventure. The generous nine hour cut-off should ensure a successful day for everyone.

The course is 100% dirt and 90% sweet Colorado singletrack. The terrain ranges in difficulty from smooth dirt trail to technical rock gardens. A small portion of the route is on smooth dirt road (no motor vehicle access) and gravel bike path, with the meat of the running done on the beautiful and distinctive redstone hardpack of the Blue Sky Trail.

After the race, kick back and enjoy the always-popular barbeque and generous sponsor giveaways.

October 16, 2021
Fort Collins
The number for participants for the whole event is capped to 350.


Blue Sky Trail Marathon
October 16, 2021 (Saturday) - 07:00
26.7 miles
3,500 feet
3,500 feet
6 Aid Stations
1 ITRA Points
Cut off: 09:00 hours
UTMB qualifier Solo After Race Meal Expo Live tracking of runners Bag Storage Medals for finishers Parking Finishers Gift Toilets Electronic timing Finishers T-Shirt Medical Services Photos Hilly Mountain Range Single loop Timed Trail
The information about this event is based on data from the official website or may be provided by the organiser. Before booking flights or accommodation check the event's website and social media. If this listing is not up-to-date, please let us know at [email protected]


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