Colorado · Marathon · Half Marathon · 26.7 Miles
Blue Sky Trail Marathon & Half Marathon
Blue Sky Trail Marathon & Half Marathon is a marathon, half marathon, 26.7 Miles and 13.4 Miles event held in Fort Collins, Colorado. Its next confirmed date is Saturday, October 17, 2026.
- Race day
- October 17, 2026
- Location
- Fort Collins, CO
Race details
- Date
- Saturday, October 17, 2026
- Location
- Fort Collins, Colorado
- Distances
- Marathon, Half Marathon, 26.7 Miles, 13.4 Miles
- Course
- Marathon: ~3,500 ft gain/loss (100% dirt, 90% singletrack); Half Marathon: ~1,800 ft gain/loss. Trail race between Horsetooth Mountain Park and Devil's Backbone Open Space.
- Registration
- runsignup.com
- Official website
- gnarrunners.com
About the Blue Sky Trail Marathon & Half Marathon
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…
More marathons in Colorado
Coming up next, by confirmed date.
-
Colorado Springs Marathon, Half, 5K, and Kids KColorado Springs, COMarathonHalf Marathon10K5K +1 more
-
Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile RunWindsor, COMarathonHalf Marathon10K5K +1 more ~660 runners
More races in Fort Collins
-
Colorado 24 Hour RunFort Collins, CO
More upcoming races in Colorado
Keep exploring
- All races in Colorado
- 5Ks in Colorado143 upcoming races
- 10Ks in Colorado63 upcoming races
- Half Marathons in Colorado38 upcoming races
- Marathons in Colorado10 upcoming races
- Half Marathons in the United States1,289 upcoming races
- Marathons in the United States353 upcoming races
- October Marathons
- Marathons in Utah13 upcoming races
- Marathons in New Mexico5 upcoming races
- Marathons in Kansas4 upcoming races
- Marathons in Nebraska1 upcoming race
Guides from the RaceRove blog
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Blue Sky Trail Marathon & Half Marathon: common questions
- When is the Blue Sky Trail Marathon & Half Marathon?
- The next confirmed date is Saturday, October 17, 2026.
- Where is the Blue Sky Trail Marathon & Half Marathon held?
- In Fort Collins, Colorado.
- What distances does the Blue Sky Trail Marathon & Half Marathon offer?
- Marathon, Half Marathon, 26.7 Miles and 13.4 Miles.
- How do I register for the Blue Sky Trail Marathon & Half Marathon?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.