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Race Overview
Named among the Best Fall Marathons by Runner's World, #5 Best Half Marathon in the US by Active, as well as #1 Best in Colorado and one of the "Most Beautiful Marathons in the World" by HalfMarathons.Net, Boulderthon drew over 6,000 runners from all 50 states and 18 countries in 2023, and has doubled in size every year since its inception.
WikipediaFAQ
When is the 2026 Boulderthon Marathon?
The 2026 Boulderthon Marathon will be held on Sunday September 27, 2026.
Is the Boulderthon Marathon a Boston Marathon Qualfier?
Yes, the Boulderthon Marathon is an official Boston Marathon qualifier.
What is the time limit for the Boulderthon Marathon?
The time limit for the Boulderthon Marathon is 6 hours.
Boulderthon Marathon Weather History
Boulderthon Marathon Weather Averages
Average Temp: 61°, Average Low: 47°, Average High: 76°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp | 47° | 50° | 55° | 62° | 67° | 71° | 72° |
| Feel | 47° | 50° | 55° | 62° | 67° | 71° | 72° |
| Rain | - | - | - | - | - | - | - |
| Wind | 1mph | 1mph | 1mph | 0mph | 3mph | 4mph | 3mph |
| Dew | 36° | 36° | 36° | 37° | 36° | 36° | 35° |
| RunScore |  | | | | | | |
Boulderthon Marathon 2025
Sep 28, 2025
Partly cloudy throughout the day.
Low: 52°, High: 77°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp |  52° | 54° | 59° | 63° | 68° | 72° | 74° |
| Feel | 52° | 54° | 59° | 63° | 68° | 72° | 74° |
| Rain | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 0mph | 1mph | 4mph | 6mph | 6mph |
| Dew | 43° | 45° | 45° | 47° | 45° | 47° | 45° |
| RunScore | | | | | | | |
Boulderthon Marathon 2024
Sep 29, 2024
Clear conditions throughout the day.
Low: 55°, High: 88°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp | 57° | 60° | 66° | 71° | 75° | 79° | 80° |
| Feel | 57° | 60° | 66° | 71° | 75° | 79° | 80° |
| Rain | - | - | - | - | - | - | - |
| Wind | 4mph | 3mph | 0mph | 0mph | 1mph | 2mph | 0mph |
| Dew | 41° | 40° | 37° | 41° | 41° | 42° | 42° |
| RunScore |  | | |  | | | |
Boulderthon Marathon 2023
Oct 8, 2023
Clear conditions throughout the day.
Low: 44°, High: 77°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp |  44° | 46° | 55° | 64° | 70° | 73° | 75° |
| Feel | 44° | 46° | 55° | 64° | 70° | 73° | 75° |
| Rain | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 0mph | 0mph | 0mph | 6mph | 3mph |
| Dew | 32° | 32° | 32° | 32° | 30° | 30° | 28° |
| RunScore | | | | | | | |
Boulderthon Marathon 2022
Oct 9, 2022
Clear conditions throughout the day.
Low: 41°, High: 72°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp | 41° | 43° | 52° | 60° | 63° | 67° | 69° |
| Feel | 41° | 43° | 52° | 60° | 63° | 67° | 69° |
| Rain | - | - | - | - | - | - | - |
| Wind | 0mph | 2mph | 0mph | 0mph | 2mph | 4mph | 3mph |
| Dew | 36° | 36° | 38° | 34° | 33° | 34° | 32° |
| RunScore | | | | | | | |
Boulderthon Marathon 2021
Oct 10, 2021
Clear conditions throughout the day.
Low: 42°, High: 68°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM |
|---|---|---|---|---|---|---|---|
| Temp | 42° | 46° | 45° | 52° | 59° | 63° | 63° |
| Feel | 42° | 46° | 43° | 52° | 59° | 63° | 63° |
| Rain | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 3mph | 0mph | 7mph | 5mph | 4mph |
| Dew | 28° | 27° | 30° | 29° | 29° | 30° | 28° |
| RunScore | | | | | | | |