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Race Overview
This amazing run course will take you alongside the Boulder Reservoir, remaining mostly on dirt roads and trails. The course is flat with only 200 feet of gain, and will provide views of the Boulder Reservoir and Rocky Mountains.
WikipediaNews
August 9, 2023
Upcoming marathons and other races happening this weekend.
FAQ
When is the 2026 Boulder Rez Marathon?
The 2026 Boulder Rez Marathon will be held on Saturday August 15, 2026.
Is the Boulder Rez Marathon a Boston Marathon Qualfier?
Yes, the Boulder Rez Marathon is an official Boston Marathon qualifier.
Boulder Rez Marathon Weather History
Boulder Rez Marathon Weather Averages
Average Temp: 64°, Average Low: 53°, Average High: 75°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 53° | 57° | 61° | 65° | 68° | 70° | 73° | 74° |
| Feel | 53° | 56° | 61° | 64° | 67° | 69° | 71° | 72° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 2mph | 1mph | 2mph | 3mph | 2mph | 4mph | 4mph | 5mph |
| Dew | 45° | 46° | 46° | 46° | 46° | 44° | 43° | 43° |
| RunScore |  | | | | | | |  |
Boulder Rez Marathon 2025
Aug 2, 2025
Clear conditions throughout the day with late afternoon rain.
Low: 52°, High: 90°, Light Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 54° | 61° | 68° | 76° | 79° | 82° | 90° | 88° |
| Feel | 54° | 61° | 68° | 76° | 79° | 80° | 86° | 85° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 1mph | 5mph | 4mph | 8mph | 10mph | 8mph |
| Dew | 50° | 53° | 50° | 51° | 43° | 39° | 36° | 35° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2024
Aug 3, 2024
Clear conditions throughout the day.
Low: 63°, High: 96°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 63° | 70° | 77° | 81° | 87° | 90° | 92° | 95° |
| Feel | 63° | 70° | 77° | 80° | 83° | 86° | 88° | 91° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 3mph | 0mph | 1mph | 3mph | 0mph | 4mph | 2mph | 7mph |
| Dew | 45° | 44° | 45° | 44° | 43° | 42° | 41° | 38° |
| RunScore |  | | | |  | | | |
Boulder Rez Marathon 2023
Aug 12, 2023
Partly cloudy throughout the day.
Low: 62°, High: 82°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 64° | 65° | 72° | 74° | 76° | 81° | 82° | 81° |
| Feel | 64° | 65° | 72° | 74° | 76° | 80° | 80° | 80° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 3mph | 1mph | 1mph | 1mph | 0mph | 0mph | 5mph | 10mph |
| Dew | 49° | 52° | 52° | 52° | 53° | 47° | 45° | 48° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2022
Aug 13, 2022
Partly cloudy throughout the day with late afternoon rain.
Low: 67°, High: 88°, Light Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 67° | 72° | 74° | 78° | 80° | 81° | 84° | 86° |
| Feel | 67° | 72° | 74° | 78° | 80° | 81° | 82° | 84° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 4mph | 5mph | 5mph | 4mph | 2mph | 3mph | 4mph | 3mph |
| Dew | 53° | 54° | 54° | 53° | 54° | 52° | 52° | 53° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2021
Aug 14, 2021
Clear conditions throughout the day.
Low: 61°, High: 91°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 61° | 66° | 71° | 76° | 79° | 83° | 85° | 88° |
| Feel | 61° | 66° | 71° | 76° | 79° | 82° | 83° | 86° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 1mph | 0mph | 0mph | 0mph | 4mph | 3mph | 4mph | 1mph |
| Dew | 54° | 56° | 56° | 54° | 54° | 54° | 54° | 52° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2019
Sep 8, 2019
Partly cloudy throughout the day with late afternoon rain.
Low: 54°, High: 74°, Light Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 54° | 59° | 62° | 64° | 66° | 69° | 72° | 74° |
| Feel | 54° | 59° | 62° | 64° | 66° | 69° | 72° | 74° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 3mph | 4mph | 1mph | 4mph | 3mph | 4mph | 3mph |
| Dew | 47° | 47° | 45° | 45° | 46° | 45° | 45° | 45° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2018
Oct 7, 2018
Partly cloudy throughout the day with late afternoon rain.
Low: 38°, High: 45°, Light Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  38° |  40° | 42° | 43° | 44° | 44° | 43° | 45° |
| Feel | 34° | 37° | 38° | 39° | 42° | 41° | 41° | 42° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 6mph | 4mph | 7mph | 8mph | 5mph | 5mph | 3mph | 6mph |
| Dew | 36° | 36° | 36° | 38° | 38° | 38° | 39° | 41° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2017
Oct 10, 2017
Clear conditions throughout the day.
Low: 29°, High: 57°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 29° | 30° | 36° | 42° | 46° | 51° | 53° | 55° |
| Feel | 29° | 30° | 36° | 42° | 46° | 51° | 53° | 55° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 0mph | 0mph | 1mph | 1mph | 4mph | 1mph |
| Dew | 27° | 28° | 32° | 32° | 32° | 28° | 27° | 28° |
| RunScore | | | | | | | | |
Boulder Rez Marathon 2015
Oct 4, 2015
Cloudy skies throughout the day.
Low: 47°, High: 54°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 47° | 49° | 50° | 50° | 52° | 52° | 52° | 54° |
| Feel | 47° | 49° | 50° | 50° | 52° | 52° | 52° | 54° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 3mph | 0mph | 1mph | 4mph | 2mph | 5mph | 3mph | 2mph |
| Dew | 47° | 48° | 48° | 48° | 48° | 48° | 49° | 49° |
| RunScore | | | | | | | | |