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Boston Cut-off Time Prediction Contest

Predict the 2027 Boston Cut-off Time and win a great prize and bragging rights among all your running friends.

Submit Your Prediction

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Historical weather

Historical Race Day Weather for the Boulderthon - Boulder Marathon

See historical race day weather for the Boulderthon - Boulder Marathon, including start temperature, humidity, wind, race day temperatures, PR score, and course score.

Weather Averages for Last 4 Years

Race day snapshot

Clear

Most common race morning weather across the last 4 years.

Start Line Conditions

Start Temp 59°F 15°C

Start Humidity 46% Humidity

Wind WNW 2 mph

Race day high 75°F 24°C

Race day low 49°F 9°C

PR Score 91.55 Weather-influenced race day scoring

Course Score 92.06 Course-only Score

Race Day Weather by Year

Most recent years appear first so you can quickly compare start conditions, temperatures, wind, and scores across different editions of the race.

September 27, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 56°F 13°C

Start Humidity 57% Humidity

Wind WNW 3 mph Wind

Race day high 66°F 19°C

Race day low 44°F 7°C

PR Score 0.00 Normal score 92.68

Course Score 0.00 Course-only Score

Boston Qualifying Cut-off Time Prediction Contest