MO Cowbell Marathon

St. Charles, MO, USA · November 08, 2026
clear-day41°·57° high·Light·Dry
8
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Race Day Weather

clear-day
41°at start
57° high
Light
Dry

Cool start, steady warming

Runners will face temperatures starting at 42°F and climbing to 54°F by the finish. With light winds from the WNW at 6 mph, conditions will be manageable. Runners should maintain a conservative pace early as humidity is at 69%, which may impact comfort. Hydration will be key, particularly as temperatures rise in the later laps.

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Pace Calculator

Distance: 26.2mi
0:00:00
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Race Plan

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Weather-adjusted pacing, per-mile terrain splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide — all personalized to your goal and race-day conditions.

Race Conditions
Terrain Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

Race Info

MO' Cowbell Marathon has run through St. Charles, Missouri since 2011, started by local organizers to host a family-friendly race for the community. The USATF-certified course starts and finishes along the Missouri River in Frontier Park, staying flat for about ten miles before a two-mile hilly stretch on the Little Hills Expressway and a downhill final mile to the finish. It qualifies for the Boston, New York City, London and Chicago marathons. 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 57°F and a low of 38°F with a 1% 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
Wind11mph
Dew52°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
partly-cloudy-day
68°/85°-
7
2024
clear-day
72°/82°-
7
2023
clear-day
70°/85°-
7
2022
clear-day
56°/77°-
8
2021
partly-cloudy-day
72°/77°Light
7
2019
partly-cloudy-day
62°/66°Light
9
2018
cloudy
69°/86°Light
6
2017
partly-cloudy-day
58°/77°-
8
2016
cloudy
62°/71°-
9
2015
cloudy
52°/58°-
8
2014
partly-cloudy-day
51°/73°-
8
2013
partly-cloudy-day
53°/57°Light
7