The 2026 Aspen Backcountry Marathon has concluded.
Aspen Backcountry Marathon
Race complete
Aspen, CO, USA · August 1, 2026
Race Day Weather
55°at start
87° high
Windy
Dry
Warm afternoon, adjust pace accordingly
Runners will face a starting temperature of 51°F, rising to a warm 87°F by the finish. Winds will be from the S at 16 mph, providing a moderate headwind throughout. With humidity at 28%, it's crucial for runners to pace conservatively in the early miles and hydrate frequently to manage the heat later in the race.
Pre-raceRace windowPost-race
Get forecast alerts for Aspen Backcountry Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Historical Weather
Based on 3 years of data
Avg Temp
75°F
L:51° H:76°
RunScore
Conditions
Rain Freq
33%
1 of 3 yrs
Wind8mph
Dew42°F
Temperature History
Range of temperatures during race hours for each year.
Detailed History
| Year | Conditions | Low / High | Rain | Dew Point | Score |
|---|---|---|---|---|---|
2025 |  | 54°/77° | Light | 41° | |
2023 | | 48°/75° | - | 40° | |
2022 | | 50°/77° | - | 45° |
More CO Races
American Heroes Run
2026-09-12 · Longmont, CO, USA
BOLDERBoulder
2027-05-31 · Boulder, CO, USA
Steamboat Marathon
2027-06-06 · 42.200km · Steamboat Springs, CO, USA
Estes Park Marathon
2027-06-20 · 42.200km · Estes Park, CO, USA
Hardrock 100
2027-07-09 · 160.900km · Silverton, CO, USA
Mt. Sneffels Half Marathon
2027-08-21 · 21.100km · Ouray, CO, USA