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Race Overview
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.
WikipediaFAQ
When is the 2026 Big Sky Marathon?
The 2026 Big Sky Marathon will be held on Sunday July 12, 2026.
Big Sky Marathon Weather History
Big Sky Marathon Weather Averages
Average Temp: 72°, Average Low: 52°, Average High: 89°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 55° | 62° | 69° | 73° | 78° | 83° | 85° | 87° |
| Feel | 55° | 62° | 69° | 73° | 78° | 81° | 82° | 84° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 3mph | 3mph | 5mph | 2mph | 3mph | 6mph | 5mph | 10mph |
| Dew | 39° | 41° | 40° | 42° | 42° | 41° | 38° | 34° |
| RunScore |  | |  | | | | |  |
Big Sky Marathon 2025
Jul 13, 2025
Clear conditions throughout the day.
Low: 51°, High: 90°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 55° | 61° | 66° | 73° | 77° | 81° | 82° | 86° |
| Feel | 55° | 61° | 66° | 73° | 77° | 79° | 80° | 83° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 1mph | 1mph | 1mph | 0mph | 1mph | 4mph | 5mph | 9mph |
| Dew | 38° | 40° | 40° | 40° | 38° | 40° | 40° | 38° |
| RunScore | | | | | | | | |
Big Sky Marathon 2024
Jul 14, 2024
Clear conditions throughout the day.
Low: 54°, High: 89°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 56° | 62° | 71° | 73° | 78° | 85° | 87° | 89° |
| Feel | 56° | 62° | 71° | 73° | 78° | 82° | 84° | 85° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 5mph | 6mph | 9mph | 5mph | 6mph | 7mph | 5mph | 11mph |
| Dew | 39° | 41° | 40° | 44° | 45° | 42° | 37° | 31° |
| RunScore | | | | | | | | |