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Saturday - August 2, 2025

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Aspen Backcountry

50K | Marathon | Heavy Half-Marathon

Aspen, CO

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 1
50K - 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!
Volunteer Now

CORSAR CARD

Pitkin County requires that all participants obtain a valid CORSAR card for the day of the event. Racers must
present 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.
Aravaipa Live
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Registration closes: Mon, July 28 @ 11:59PM MT

Register Now

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

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Key Stats

Date | Saturday, August 2, 2025

Start Time | 6:00 am

Time Limit | 9.5 hours (3:30pm)

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

Course Map
Caltopo Course  Map

50K Event Details

2016 Aspen Backcountry Highlights

Results & Photos

Proud Sponsors

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