MO Cowbell Marathon

St. Charles, MO, USANovember 08, 2026
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Race Day Weather

partly-cloudy-day
44°
61° high
Breezy
Dry

Cool start — fast day potential, big temp swing

A cool 44°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Temps will climb significantly to 61°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing.

Race day forecast available in 218 days
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Pace Calculator

Distance: 26.2mi
0:00:00
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Pace
Weather Adj.
Common Goals:

Join thousands from across the Midwest and beyond for the fastest, flattest course you’ve likely ever competed. MO’ Cowbell was started in 2011 with the goal of hosting a family-friendly, fun race put on by local folks for local folks. This flat course that starts and ends along the Missouri River can be used as a qualifier for other esteemed marathons such as the Boston Marathon, New York City Marathon, London Marathon and Chicago Marathon. Source

FAQ

When is the 2026 MO Cowbell Marathon?

The 2026 MO Cowbell Marathon will be held on Sunday November 8, 2026.

Is the MO Cowbell Marathon a Boston Marathon Qualifier?

Yes, the MO Cowbell Marathon is an official Boston Marathon qualifier.

What is the time limit for the MO Cowbell Marathon?

The time limit for the MO Cowbell Marathon is 6.5 hours.

What will the weather be like for the 2026 MO Cowbell Marathon?

The forecast calls for a high of 61°F and a low of 44°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 12 years of data
Avg Temp
74°F
L:62° H:74°
RunScore
7
Conditions
Rain Freq
33%
4 of 12 yrs
Wind10mph
Dew53°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
clear-day
66°/85°-
7
2024
clear-day
71°/81°-
7
2023
clear-day
69°/85°-
7
2022
clear-day
54°/76°-
8
2021
partly-cloudy-day
72°/77°Light
7
2019
cloudy
63°/65°Light
8
2018
cloudy
70°/86°Light
7
2017
partly-cloudy-day
58°/76°-
8
2016
cloudy
62°/71°-
8
2015
cloudy
51°/57°-
9
2014
partly-cloudy-day
51°/73°-
8
2013
rain
52°/57°Light
7