Run epic Front Range singletrack from Horsetooth to Devil’s Backbone, then celebrate with post-race BBQ and giveaways.
Blue Sky Trail Half Marathon takes place on October 17, 2026 in Fort Collins, CO.
Blue Sky Trail Half Marathon is 13.5 miles with 1,650 ft of elevation gain.
No — Blue Sky Trail Half Marathon uses open registration; no lottery is required.
Yes, crew is allowed at Blue Sky Trail Half Marathon. Sign in to Trailrace to see crew access for each aid station.
No, pacers are not allowed at Blue Sky Trail Half Marathon.
Yes, Blue Sky Trail Half Marathon allows drop bags.
Blue Sky Trail Half Marathon has 4 aid stations along the course.
The overall cutoff for Blue Sky Trail Half Marathon is 6h. Per-aid-station cutoffs are available to signed-in Trailrace members.
Other trail races within 46 miles
Welcome to the Blue Sky Trail Marathon & Half, Fort Collins's 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. The marathon boasts 3,500 feet of elevation gain/loss, while the half marathon checks in at 1,800 feet, and 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 barbecue and generous sponsor giveaways.
Fort Collins, CO, United StatesOctober 17, 2026
| Location | Mile | Elevation |
|---|---|---|
South Bay Start | 0.0 | 5,436 ft |
Underpass Aid Aid Station | 1.9 | 5,476 ft |
Indian Summer North Aid Station | 5.4 | 5,492 ft |
Indian Summer North Aid Station | 8.1 | 5,502 ft |
Underpass Aid Aid Station | 11.6 | 5,476 ft |
South Bay Finish | 13.5 | 5,436 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
No crew rules specified
No required gear specified
No recommended gear specified
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