Race Rules

Race rules are designed to provide a safe and fair experience for everyone involved and to help ensure our ability to produce the race again next year.

Major rule infractions by racers will result in immediate disqualification of the racer. Please do not argue with or harass our volunteers but feel free to direct any questions and feedback to racedirector@gnarrunners.com.

Course Cut-Offs

The 50 mile race will be limited to 14 hours and will end at 7:30pm.

Course cut-offs will be enforced by wave to give all runners equal time on course.

50mi Cut-Offs
Wave Soldier Canyon Arthur’s 2 (32.3mi) Horsetooth 2 (39.5mi)
4:30 11:15a 1:10p 3:35p
5:00 11:45a 1:40p 4:05p
5:30 12:15p 2:10p 4:35p


25mi Cut-Offs
Wave Arthur’s 1 (17.5mi)
6:30 1:40p
7:00 2:10p
7:30 2:40p
8:00 3:10p

This is a challenging course so some runners may find it difficult to meet these cut-off times. Any 50 mile runner who drops out or fails to meet the course cut-offs after completing the first 25 mile loop will be given a finish time in the 25 mile race, but will not be eligible for 25 mile overall and age group awards.

Note: Course cut-offs should not be used for pacing targets to reach the finish in 14 hours. We have set these cut-offs to give runners the maximum time on the course. 

Bib Numbers and Check in

  • Bibs should be worn on the front and be visible at all times. 
  • At each aid station (except the first time through Towers mile 6.1), volunteers will record runner bib numbers. Runners are responsible for making sure that aid station volunteers record their number. Please make sure that your bib number is visible from the front and call out and confirm your number when passing through an aid station. This is important so that we can keep track of runners and know that you are not lost or injured.

Dropping Out

  • If you need to drop out of the race for any reason, you must check out with the nearest aid station or course volunteer. If you do not inform us that you have dropped, we will assume that you are lost on the course.  You will be held responsible for any Search and Rescue fees incurred.


  • Bottles or other supplies may not be stashed along the course. All runners must have the capacity to carry a minimum of 20 oz of water, whether in a bottle or a hydration pack. 


  • Purposeful littering is prohibited and will result in an immediate disqualification. Carry garbage to aid stations and dispose of trash in proper garbage containers or hand garbage off to a volunteer. We recommend that you carry an extra baggie to stash small wrappers and gel tabs that can easily be dropped by accident.

Stay on the Trail

  • No bushwhacking or short cutting. Do not leave the trail when passing other runners. In case we have wet trail conditions, please run through any muddy sections to avoid widening the trail. (This is a trail race, leave the clean road shoes at home!)

Yield to Pedestrians and Horses

  • The trail system will be open to the public during the race. Pedestrians and Horses always have the right of way. Please be courteous and respect other users on the trail system. When approaching horses, talk to the rider and always wait until they give you permission to pass. Most riders will move their horses off the trail for you. Always try to assume higher ground when crossing paths with horses.
  • Mountain bikers are required to yield to runners but for your own safety, please use common sense and watch for blind corners and be careful when passing bikers.

Yield to Faster Runners

  • There will be some two way traffic as the 50 mile runners reverse direction on their second loop. Please yield to the faster oncoming runners. If being caught from behind, step aside where possible to allow the runner to pass.


  • Pacers are not allowed on the course and will result in the immediate disqualification of the runner.


  • For 2020, Crews and Spectators are Strongly Discouraged.  Lory State Park and Horsetooth Mountain Park are experiencing extremely high visitation, and we need to do our part to avoid over-crowding. 
  • There will be no expo or post-race BBQ – runners will get food & drinks to go, and expected to leave very soon after finishing.  Celebrate with your family & friends post-race at a great local restaurant.
  • Runners may not receive any additional crew aid outside of designated aid stations. Crewing on the course will result in the immediate disqualification of the runner.

Trekking Poles

  • This is a running race on tight – sometimes heavily populated – trails. No mechanical aid (poles, traction devices, etc.) unless approved by race staff prior to the race for a specific reason.

Drop Bags

  • Runners can place drop bags at every aid station.  We want runners to have this extra resource, to help make up for more limited crews & aid.  Runners can also use their drop bags to avoid high risk areas in aid stations by self-aiding.
    • Drop bags for Towers Aid (miles 7.1 / 14.1 / 35.7 / 42.7) are strongly discouraged due to space constraints, and must be dropped off Friday night.  This allowance is only in place to serve runners with significant special needs.
    • Drop bags for Horsetooth Aid (miles 10.3 / 39.5) must be dropped off Friday night
      • If a Friday night drop-off imposes significant difficulties for you, email the RD.
  • Drop bags need to be a reasonable size (small duffle bag / gallon ziplock), soft-sided, and contain no breakable items or valuables
  • Drop bags need to clearly labeled with runner Name, Bib Number and Location
  • Drop bags cannot be protected if rain/hail occurs.  Prepare accordingly
  • Sanitizing spray/wipes will be available for runners & volunteers who handle drop bags
  • We will not be responsible for any lost or stolen items so please do not leave any valuables in your drop bags.


  • Dogs are not allowed on the course with runners. Dogs on leash are welcome at the park trailheads.  Again, spectators & crews are strongly discouraged.


  • Park restrooms are available at the Soldier Canyon, Arthur’s, and Horsetooth trailheads. Additional portable toilets will be available for race participants at the Soldier Canyon start/finish.


  • Please do not leave any valuables at the start/finish or aid stations. Volunteers are not responsible for returning items left behind at aid stations. We are not responsible for any lost or stolen items.

Cancellation & Refund Policy

With the exception of wait list transfers, 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. See our registration page for our wait list transfer policy.