Aspen Backcountry Heavy Half Marathon

Aspen, CO, USA · July 31, 2027·
partly-cloudy-day56°·66° high·Calm·Dry
7
Register

Race Day Weather

partly-cloudy-day
56°at start
71° high
Light
Dry
Your goal
0:00:00

Comfortable temps, big temp swing, chance of rain

Mild 56°F temps at gun time mean comfortable early miles without overheating risk. Temps will climb significantly to 71°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing. There's a chance of rain, so have a backup gear plan ready.

Race day forecast available in 272 days
partly-cloudy-night10
partly-cloudy-day10
partly-cloudy-day8
partly-cloudy-day7
partly-cloudy-day6
partly-cloudy-day6
partly-cloudy-day5
partly-cloudy-day5
partly-cloudy-day5
partly-cloudy-day5
partly-cloudy-day6
partly-cloudy-day6
partly-cloudy-day6

Pace Calculator

13.1mi
0:00:00
HH:MM:SS
Pace
—

Enter a finish time to see what race day does to it.

Common Goals:

Get forecast alerts for Aspen Backcountry Heavy Half Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Plan

Get your personalized Aspen Backcountry Heavy Half Marathon race plan

A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.

Race Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

Race Info

The Aspen Backcountry Heavy Half Marathon starts and finishes at Rio Grande Park in Aspen on the Saturday of race weekend. It climbs out of town on dirt trails past Henry Stein Park, Hummingbird and Smugglers, running longer than a standard half marathon with steep ascents and descents. The course begins at about 7,900 feet and peaks above 10,100 feet, so it is a high alpine trail run with views of the Elk Mountains and Aspen below.

Race weekend

Saturday, July 31
6:00 AM50K (31.1 mi)7:30 AMMarathon (26.2 mi)
8:00 AMHeavy Half Marathon (13.1 mi)

FAQ

When is the 2027 Aspen Backcountry Heavy Half Marathon?

The 2027 Aspen Backcountry Heavy Half Marathon will be held on Saturday July 31, 2027.

What is the time limit for the Aspen Backcountry Heavy Half Marathon?

The time limit for the Aspen Backcountry Heavy Half Marathon is 8 hours.

What will the weather be like for the 2027 Aspen Backcountry Heavy Half Marathon?

The forecast calls for a high of 72°F and a low of 48°F with a 11% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

Historical Weather

Based on 5 years of data
Avg Temp
63°F
L:58° H:67°
RunScore
7
Conditions
Rain Freq
40%
2 of 5 yrs
Wind5mph
Dew43°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
clear-day
62°/76°-
7
2025
cloudy
58°/67°Light
7
2023
partly-cloudy-day
52°/65°-
8
2022
partly-cloudy-day
57°/67°-
7
2019
cloudy
62°/63°Light
7