Big Sky Marathon

Ennis, MT, USAJuly 12, 2026

Race Day Weather

clear-day
51°
81° high
Breezy
Dry

Warm afternoon, steady winds

Runners will face a temperature increase from 53°F at the start to a high of 81°F by the finish. Winds will be from the WSW at 10 mph, with gusts up to 25 mph. Given the warming conditions, participants should consider adjusting their pace as the race progresses and stay hydrated throughout.

Race day forecast available in 104 days
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Pace Calculator

Distance: 26.2mi
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Common Goals:

The Big Sky Marathon offers runners a thrilling point-to-point course through Montana's high mountains, starting at approximately 8,600 feet elevation and descending into the charming town of Ennis. This trail marathon is part of the Greater Yellowstone Adventure Series and features stunning mountain views throughout the challenging downhill route. The race is known as one of the longest downhill road marathons on the planet, making it a bucket list event for serious runners. Source

Area Map

Course Map

FAQ

When is the 2026 Big Sky Marathon?

The 2026 Big Sky Marathon will be held on Sunday July 12, 2026.

Historical Weather

Based on 2 years of data
Avg Temp
87°F
L:55° H:87°
RunScore
7
Conditions
Rain Freq
0%
0 of 2 yrs
Wind10mph
Dew34°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScore
2025
clear-day
55°/86°-
8
2024
clear-day
56°/89°-
8