The 14th running of the Blue Sky Trail Marathon will be October 16, 2021.

Registration is OPEN

We hope for close-to-normal conditions on race day 2021, as related to the COVID-19 pandemic. Current race information reflects a normal year.  Details may change as race day approaches, and any changes will be communicated to registered runners well in advance.  For reference, here are the 2020 COVID Safety Protocols.

Fees for the 2021 Blue Sky Marathon will be as follows:

Dec 15 – May 31: $85
June 1 – Aug 31: $95
Sept 1 – Oct 15: $105

What You Get in Return for Your Registration Fee

  • A kick-ass, well marked, and challenging course on some of the best trails in Fort Collins.
  • Enthusiastic, knowledgeable race and aid station volunteers.
  • Fully stocked aid stations.
  • Larimer County Parks day parking pass
  • Generous 9 hour cut off time.
  • Gender specific race T-shirt.
  • Unique finisher award and overall and age group awards.
  • Post race BBQ and raffle.

Waiting List

In the event that the race sells out, we will maintain a waiting list and transfer runners from the waiting list to the race roster should other runners already registered not be able to attend.

Transfer Credit Policy

In the event that the race sells out and there are runners on the waiting list, we will offer a race-transfer option, allowing runners a credit according to the following schedule:

  • Until Jan 31: 100% credit of registration fee (excluding UltraSignup fees)
  • Feb 1 – Sept 21: 75% credit of registration fee (excluding UltraSignup fees).
  • Sept 22 – Oct 13: 50% credit of registration fee (excluding UltraSignup fees).

Credits may be applied to any future Gnar Runners race and will be valid for 12 months.

If we do not have runners on the waiting list available to accept a transfer entry, then unfortunately we will not be able to offer a credit.

To request a transfer credit, please email us at

Cancellation & Refund Policy

Entries are non-refundable and non-transferable. In the event the race is cancelled due to extreme weather, fire, or for some other unforeseeable event, we cannot offer refunds or credits.