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2024 Registration

Advance registration is required. There will be no race day registration.


Early Until May 3rd

Regular Until June 28th

Late After June 28th













Register Here

Racer Check in & Bib Pickup

Check-in will be on Friday July 19th from 4pm to 7pm at Aspen Mountain Upper Gondola Plaza. All 50k and 25k racers must check in during this time to pick-up a racer bib. 10k racers may pick up their racer bib during this time or at the start line beginning at 10am on race day. There will be a pre-race info meeting at 6pm during check-in. All 50k and 25k racers who have not raced here previously are encouraged to attend.

Racer Bags

Each racer in the 50K division can have a drop bag taken to the halfway point. Make sure your name and bib number are clearly written on the outside of the bag. Bags will be dropped at the Tiehack aid station and then brought to the finish.

Start Details


Start Time


Aspen Mountain Upper Gondola Plaza
Tiehack Lift - Buttermilk Mountain
Elk Camp Restaurant - Snowmass

10K competitors will be given a complimentary pass to ride the gondola to the start at the Elk Camp Restaurant which is mid-mountain on Snowmass. Please note, the start time for the 25K has shifted from 9am to 8am.

Cut-off time

To ensure racer safety, we will have cut-off times: Noon at tiehack, 3pm at the Elk Camp.

Course Marking

The course will be marked with red and white striped tape and directional signage with the event logo.

Aid Stations

Supplies will include water, Skratch Hydration Mix, Skratch Bars, Skratch Gels, bananas, chips, uncrustables and candy. You should plan to be able to make it from aid station to station without additional support.

  • Top of Aspen Mountain | 2.58 miles from start
  • Intersection of Midnight Mine and Castle Creek Road | 7.86 miles from start
  • Aspen Highlands Ski Patrol Headquarters | 11.3 miles from start
  • Tiehack Parking Lot | 17 miles from start
  • West Buttermilk Gate
  • Elk Camp Restaurant | 24.8 miles from start

Prizes & Awards

All racers will receive a custom gift. The top 3 finishers in each gender will be awarded medals at the podium ceremony at the finish. Prize money will be awarded to the top 3 finishers in each gender for the 50K division - 1st - $500, 2nd - $250, 3rd - $125.


  • Stay on the designated trails; no short-cutting switchbacks. Those attempting to take short-cuts will be disqualified and publicly shamed.

  • Headphones are permitted, but please be respectful when entering aid stations and crossing other trails. Be aware that the trails are open to the public and, in spots, cross other trails that may include cyclist, runners, hikers, etc. Please rock-out responsibly.

  • If you choose to drop out please alert the nearest aid station personnel. We do not want to worry your emergency contact person!

  • No littering! We have trash cans and recycle bins at each aid station. Just because it's a race doesn't mean you get to forget your manners.

  • If you must relieve yourself, please use a bathroom or discretion...

Normal Mountain Operations

We ask each racer to keep in mind that Snowmass and Aspen Mountain will be open to guests as usual starting at 10am. Also Government Trail is open to the general public on race day so please be respectful of the general public on the trails and aware of other users.

Racer Safety

For the safety of every racer, each athlete is required to notify the closest course marshal of any injury or racer who appears to have ventured off-course ASAP. We will have plenty of medical staff available to assist along the course.

Refund Policy

Entry fees will be refunded ONLY to athletes with a valid medical reason under the following provisions: Entry fees will be refunded if requested 1 week prior to first day of event onsite registration. Participants must have a valid medical reason and documentation, each case will be reviewed. A 25% service charge will be deducted from all refunds. All refunds are at the sole discretion of Aspen Snowmass. Absolutely no refunds will be given after the above date regardless of reason and no refunds will be given due to event cancellation. Registrations are non-transferable.


Paid parking is available near the 50K start in Aspen on the streets or the Rio Grande Garage. The Snowmass Garage at the finish line has free parking available. Free parking is also available at the Brush Creek Lot. We have arranged for an early RFTA bus to leave the Brush Creek lot at 5am heading to Rubey Park in Aspen. The first normally scheduled bus leaves Brush Creek at 5:30am and arrives in Aspen's Rubey Park at 5:48am. If you are staying in Snowmass and plan to bus this will be your best option to get to the 50K start since the Snowmass busses to the Brush Creek lot do not start running until 6am. There is limited parking at the Tiehack parking lot (25K start). There is free bus service to the Tiehack parking lot via the Castle/Maroon bus by getting off at the Aspen Rec Center stop and between Aspen and Snowmass on RFTA. Busses run continuously between the start and finish. Please check the RFTA's website for the most up to date information.