MO Cowbell Marathon

St. Charles, MO, USA • November 08, 2026
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partly-cloudy-day Partly cloudy throughout the day.

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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

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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 Qualfier?

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.

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Historical Weather & Results

RunScore
Run Score: 7
Temp
74°F
Min/Max
62°/74°F
Dew
53°F
Days of Rain
4/12
Wind
10mph
Tap a row for details.
YearLow / HighRainResults

MO Cowbell Marathon 2025 Weather History

Clear conditions throughout the day.

2025
clear-day
66°/ 85°-
Run Score: 7

MO Cowbell Marathon 2024 Weather History

Clear conditions throughout the day.

2024
clear-day
71°/ 81°-
Run Score: 7

MO Cowbell Marathon 2023 Weather History

Clear conditions throughout the day.

2023
clear-day
69°/ 85°-
Run Score: 7

MO Cowbell Marathon 2022 Weather History

Clear conditions throughout the day.

2022
clear-day
54°/ 76°-
Run Score: 8

MO Cowbell Marathon 2021 Weather History

Partly cloudy throughout the day with rain.

2021
partly-cloudy-day
72°/ 77°Light
Run Score: 7

MO Cowbell Marathon 2019 Weather History

Partly cloudy throughout the day with rain.

2019
cloudy
63°/ 65°Light
Run Score: 8

MO Cowbell Marathon 2018 Weather History

Partly cloudy throughout the day with a chance of rain throughout the day.

2018
cloudy
70°/ 86°Light
Run Score: 7

MO Cowbell Marathon 2017 Weather History

Partly cloudy throughout the day.

2017
partly-cloudy-day
58°/ 76°-
Run Score: 8

MO Cowbell Marathon 2016 Weather History

Cloudy skies throughout the day with afternoon rain.

2016
cloudy
62°/ 71°-
Run Score: 8

MO Cowbell Marathon 2015 Weather History

Partly cloudy throughout the day.

2015
cloudy
51°/ 57°-
Run Score: 9

MO Cowbell Marathon 2014 Weather History

Clearing in the afternoon.

2014
partly-cloudy-day
51°/ 73°-
Run Score: 8

MO Cowbell Marathon 2013 Weather History

Partly cloudy throughout the day with rain.

2013
rain
52°/ 57°Light
Run Score: 7
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR