Aspen Backcountry Marathons

August 1st 2026
Aspen, CO
14.6 Miles | 26.2 Miles | 50 KM

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. The 50k 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! 

Upcoming Races

Aug 1 2026
14.6 Miles
3,169 ft.
Single Loop
3 Aid Stations
7:30 Cutoff
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts
Aug 1 2026
26.2 Miles
4,764 ft.
Single Loop
5 Aid Stations
8:00 Cutoff
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts
Aug 1 2026
50 KM
5,512 ft.
Lollipop
5 Aid Stations
9:30 Cutoff
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts

Results

Date Finishers Top Result (F) Top Result (M)
08/02/25 49 4:55:19 4:30:19
Date Finishers Top Result (F) Top Result (M)
08/02/25 Results Not Available Submit Results
07/30/22 59 4:07:43 4:16:16

14.6 Miles

Date Finishers Top Result (F) Top Result (M)
08/02/25 Results Not Available Submit Results

Weekly Newsletter

A roundup of the week's content and most recent race results. Sent once a week on Thursday.

Recent Results

Buckeye Trail 50K - Summer
Brecksville, OH - 193 finishers
50 KM
The Dizzy GOAT
Gretna, NE - 83 finishers
12 Hours | 6 Hours
To Bone and Back
Idaho Falls, ID - 12 finishers
40 Miles
Night Howler 50
Hoover, AL - 84 finishers
50 Miles
Black Hills 100
Sturgis, SD - 243 finishers
100 Miles | 50 Miles | 50 KM
Hollis Heat: Time Trials
Ellenboro, NC - 13 finishers
50 KM
Chase the Moon Endurance Run
Highlands Ranch, CO - 107 finishers
50 KM | 12 Hours | 6 Hours
No Shame Shindig
Pierce, NE - 13 finishers
50 Miles | 50 KM
Wy'east Wonder
Parkdale, OR - 254 finishers
50 Miles | 50 KM
View All Results