Blue Sky Trail Marathon

  • UTMB Ultra-Trail du Mont-Blanc Qualifying RaceStart: Blue Sky Trailhead, Horsetooth Mountain Park. Fort Collins, CO
  • Distance: 26.7 miles with ~3,500′ of vertical gain and ~3,500′ of descent
  • Mode of Transportation: Foot
  • Date: October 17, 2020
  • Start Times: 7:00-8:45 AM (Wave Starts)
  • Cut Off: 9 Hours
  • 1 UTMB Point


Due to increased activity in the southeast portion of the Cameron Peak Fire, trails comprising our course in Horsetooth Mountain Park and Devil’s Backbone Open Space closed the morning of Wednesday, October 14.

After a full day’s firefighting and the updates the morning of Thursday, October 15 from the Incident Command Team, all information is pointing toward the closures and evacuations affecting our course remaining in place through the weekend.  Even if we could get permission to hold the race, we know it would be irresponsible to put any extra burden on first responders and public lands officials, and we are officially CANCELLING the Blue Sky Trail Marathon for this Saturday.

We know our runners and volunteers have questions regarding postponement and more.  So do we.  That conversation starts with our permitting land agencies, and they definitely have many higher priorities at this time.  We will update you once it’s possible.  Thank you for your understanding, and we appreciate your support.

This fire has now been burning more than two months, and is officially the largest in Colorado state recorded history.  If you would like to support relief efforts with donations of time or money, please check out this article from The Coloradoan.


Sign the COVID-19 Waiver
Check your Wave Assignment & Waiver Receipt Status

Live Runner Tracking

If you have friends or family who want to virtually follow your progress, point them to our free live tracking via OpenSplitTime.

At each aid station (except Towers, Mile 4.4), volunteers will record bib numbers, and that data will generally go out near-live on the web within 5-10.

For personalized email or text notifications about a runner:

1. Visit OpenSplitTime and sign up for an account
2. Log in
3. Go to the race, find your runner and click their name
4. Locate the box that says “Notify me” and click the email or text button

SOLD OUT – Join the Waitlist

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.