Saturday, Oct 17, 2020 @ 7:00 AM
Registration closes: Thu, Oct 15 @ 11:59 PM

Blue Sky is a GO

We are very happy to announce that the Blue Sky Trail Marathon has provisional approval from the Larimer County Department of Public Health and Larimer County Department of Natural Resources! The approval is contingent on pandemic requirements remaining at (or improving from) their current levels of restrictiveness. Help keep the curve flattened!

Many thanks to innumerable friends and resources who helped craft a plan where the event can safely happen.

There’s a lot to communicate. Whether you are a runner, volunteer, pacer or crew - we need you to read it all - before you come to the race - including our full list of safety protocols and race changes.

As the pandemic continues to evolve, there is a strong chance some of these protocols will too. We promise to communicate any changes via email, social media and our website - but it is ultimately your responsibility to read, understand and follow the full list.

Here is a summary of the main points:
ALL participants (runners & volunteers) are required to:
Sign a COVID-specific waiver
Wear a mask at all times, except when 1) running 2) eating/drinking
Have a contactless Temperature Check upon arrival. Those with temperatures above 100.4F will be required to leave
Limited Service at Aid Stations, Changes to Drop Bag Policies
Wave Starts & changes to start times (see info here; wave swap requests due by Oct 11)
No Awards Ceremony, Food/Drinks-To-Go
Discouraging attendance of families & spectators

We all look forward to a fun, relaxed atmosphere that feels normal, yet we all also know things will be different. Our approval to hold this race is contingent on following safety protocols submitted to and approved by the Larimer County Department of Public Health, and we appreciate you playing your part. Those not cooperating will be asked to leave and could be subject to disqualification. We really don't want to have to do that, so let's all play by the rules and continue to gain trust as a responsible user group.

For current registrants, if you feel unsafe taking part with the protocols we’ve put in place, or this year’s race experience will not be fulfilling for you, we encourage you to defer. 100% credit transfer to 2021 will remain open for another week, through the end of the day on August 20, after which point our normal deferral policies will resume.

We are reducing our field sizes. Blue Sky will be capped at 250. Space is still remaining as of now.

As ultrarunners ourselves, we are doing our best to strike a balance between a fulfilling race experience and ensuring we can manage risks to your health and safety. Please contact us any time with questions.

Brad Bishop & Nick Clark
Gnar Runners

P.S. Wash your hands


Welcome to the 11th running of the Blue Sky Trail Marathon, 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.

With over 3,300 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 barbecue and generous sponsor giveaways.

Rules & Registration Detail

Please visit our registration page for our complete transfer and refund policy.

Click here to view our complete rules and cut off details.

Local time: 1:30 PM


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