Boulder, CO
Sunday, September 27, 2026
5 Stars from 1 Reviews
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Race Dates
2026: Sunday, September 27, 2026Course Information
Profile: Rolling HillsRace Day Weather
Mean Temp.: 53°F (11°C)PR Score & Course Score
PR Score: 92.68Race Size
2025: 1,998 FinishersBQ Percentages
2025: 2.5%Miscellaneous Information
Pace Groups?: Yes
Race Day Temperatures |
High: 78°F (26°C) |
Race Start Conditions |
60°F (16°C) |
PR Score |
91.55 |
Course Score |
92.06 |
The Boulderthon - Boulder Marathon was the 42nd largest marathon in the U.S. in 2025 based on the number of finishers. In 2024, it ranked as the 62nd largest marathon in the U.S..
In 2025, 2.5% of Boulderthon - Boulder Marathon finishers achieved Boston Marathon qualifying times. In 2024, 0.3% of finishers qualified for Boston.
Based on its percentage of Boston Qualifiers (BQs), the Boulderthon - Boulder Marathon ranked 392nd among marathons in the U.S. in 2025 and 418th in 2024. In Colorado, it ranked 7th in 2025 and 9th in 2024. These rankings provide a useful benchmark for runners comparing Boston Marathon qualifying potential across different races.
The Boulderthon - Boulder Marathon has a Course Score of 92.68, ranking it as the 450th fastest marathon course in the U.S. and the 7th fastest marathon course in Colorado.
Typical race-time temperature and humidity levels are within the ideal range for optimal marathon performance. Combined with the course profile, this gives the Boulderthon - Boulder Marathon a PR Score of 92.68. The PR Score ranks the Boulderthon - Boulder Marathon as the 442nd best marathon in the U.S. for running a Personal Record (PR) and the 6th best marathon for a PR in Colorado.
Together, these rankings provide a quick snapshot of how the Boulderthon - Boulder Marathon compares with other marathons in the U.S. and Colorado for speed, PR potential, Boston Marathon qualifying success, and overall participation.
Max Elevation: 5396 feet (1645m)
Min Elevation: 5166 feet (1575m)
Elevation Gain: 799 feet (243m)
Elevation Loss: 782 feet (238m)
Course updated 06/12/2026
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