
Saturday - August 2, 2025
Aspen Backcountry
Utilizing the beautiful trails that surround Aspen, and now offering three distances - 50K, marathon and heavy half-marathon, all of which run almost exclusively on dirt trails. For the first time in 2025, Aravaipa is introducing an ultra distance that will follow the marathon course and include an out and back to the McNamara Hut which is part of the 10th Mountain Hut System.
The diversity of terrain, challenging ascents & descents and overall elevation gain will challenge even the most well-trained athletes. With spectacular views of the Elk Mountains above and the city of Aspen below, this is one race you’ll be sure to remember!
The start / finish returns to Rio Grande Park and will be hosted on the same day as the Duck Derby, a fundraising event by the Rotary Club which drops thousands of rubber ducks into the river at 2pm. The event includes a a full day of live music, youth group booths offering games and activities, bouncy houses, food trucks, soft drinks and beer, merchandise sales and a silent auction.
So come to race the beautiful Aspen trails and stick around for a full festival in the park!
*Distances may vary slightly each year due to permitting.
Start Times
Saturday, August 150K - 6:00 am
Marathon - 7:30 am
Half Marathon - 8:00 am
Bib Pickup
Friday, August 1st
Rio Grande Park,
CORSAR Card Required to grab bib
4pm-6pm
Saturday, August 2nd
CORSAR Card Required to grab bib
5:00 am - 8:00 am
Volunteer
We need help to make Aspen Backcountry possible. Volunteer perks include Aravaipa race credits, race tee and food/drink at the finish line festival!CORSAR CARD
Pitkin County requires that all participants obtain a valid CORSAR card for the day of the event. Racers mustpresent their CORSAR card at packet pick up. If you possess a Colorado hunting or fishing license it acts as the same.
You can purchase a card online HERE.
Live Tracking
Follow the 2025 Aspen Backcountry with live split points throughout race weekend.Race Registration
Until 5/14 | Until 6/30 | Until 7/28 | Race Day | |
50K | $140 | $155 | $170 | $185 |
Marathon | $130 | $145 | $160 | $175 |
Half Marathon | $80 | $90 | $100 | $110 |
*Prices do not include taxes and Ultrasignup fees. Race Goodie is NOT GUARANTEED after July 6, 2025.
Withdrawal Policy
Course Information

Date | Saturday, August 2, 2025
Start Time | 6:00 am
Distance | 30.39 Miles
Total Elevation Gain | 5,512 feet
Max Elevation | 10,385 feet
Women's Course Record | New in 2025
Men's Course Record | New in 2025
2016 Aspen Backcountry Highlights
Results & Photos