The 2026 MO Cowbell Marathon has concluded.Share your finish

MO Cowbell Marathon

Race complete
St. Charles, MO, USA · November 08, 2026·
clear-day36°·55° high·Breezy·Dry
10
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MO Cowbell Marathon race day weather

clear-day
36°at start
66° high
Breezy
Dry
Your goal
0:00:00

Cool start, warming finish

Runners will face temperatures starting at 36°F and rising to 55°F by late laps. Winds will be light, averaging 13 mph from the WSW, making it a non-factor for pacing. With humidity at 66%, hydration will be crucial, especially during the warmer later laps. Runners should consider layering for the pre-race wait to stay comfortable.

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clear-day7
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Pace Calculator

26.2mi
0:00:00
HH:MM:SS
Pace
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Enter a finish time to see what race day does to it.

Common Goals:

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MO Cowbell Marathon route and elevation

The MO Cowbell Marathon course has about 334 ft (102 m) of climbing and 339 ft (103 m) of descent, and finishes near the elevation it starts. It is hillier than 53% of the marathon courses racecast.io has mapped, measured by what the hills cost in time. The hardest mile is mile 21, with 70 ft (21 m) of climbing and a 1.3% average grade.

Biggest climbs

  • Miles 6.4 to 10.8: climbs about 110 ft (33 m).
  • Miles 15.9 to 17.4: climbs about 85 ft (27 m).
  • Miles 20 to 21.2: climbs about 85 ft (26 m).

What the hills cost

  • 3:30 on a flat course is about 3:31 here (1 minute slower).
  • 4:00 on a flat course is about 4:01 here (1 minute slower).
  • 4:30 on a flat course is about 4:31 here (1 minute slower).

Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.

Even-effort splits for a 3:30, 4:00 or 4:30 finish
The MO Cowbell Marathon mile splits at even effort for three finish times, with each mile's climb and descent
MileClimbDescent3:304:004:30
124 ft24 ft7:589:0610:14
22 ft11 ft7:569:0410:12
34 ft7 ft7:579:0610:14
48 ft7 ft7:589:0610:15
514 ft4 ft8:049:1210:21
68 ft10 ft7:579:0610:15
78 ft11 ft7:589:0610:14
810 ft8 ft7:599:0810:16
925 ft3 ft8:099:1810:28
1050 ft18 ft8:149:2510:35
1150 ft14 ft8:169:2710:38
1211 ft92 ft7:408:469:52
135 ft9 ft7:589:0610:14
147 ft7 ft7:589:0710:15
154 ft2 ft8:009:0710:16
1614 ft9 ft8:009:1010:18
1714 ft11 ft8:009:0810:17
1874 ft31 ft8:199:3110:42
195 ft57 ft7:478:5310:00
209 ft7 ft7:599:0710:16
2170 ft3 ft8:319:4510:57
2220 ft76 ft7:468:529:59
237 ft17 ft7:559:0310:11
249 ft10 ft7:589:0710:15
253 ft3 ft7:599:0610:15
2610 ft7 ft7:599:0810:17
Last 0.21 ft3 ft1:452:002:14

Explore the MO Cowbell Marathon course with the weather and your pace along the route, or compare it with other races.

Race Plan

Get your personalized MO Cowbell Marathon race plan

A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.

Race Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

About the MO Cowbell Marathon

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

Race weekend

Sunday, November 8
7:30 AMMarathon (26.2 mi)
7:30 AMHalf Marathon (13.1 mi)8:00 AM10K (6.2 mi)
8:00 AM5K (3.1 mi)

MO Cowbell Marathon 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 66°F and a low of 34°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

What is the elevation gain of the MO Cowbell Marathon?

The MO Cowbell Marathon course has about 334 ft (102 m) of climbing and 339 ft (103 m) of descent, and finishes near the elevation it starts. It is hillier than 53% of the marathon courses racecast.io has mapped, measured by what the hills cost in time.

Is the MO Cowbell Marathon hilly?

Moderately. It has about 13 ft (4 m) of climbing per mile. The hardest mile is mile 21, with 70 ft (21 m) of climbing and a 1.3% average grade. 4:00 on a flat course is about 4:01 here (1 minute slower).

What is the weather usually like for the MO Cowbell Marathon?

Over the 13 years racecast.io has race-day weather for (2013 to 2026), it averaged 57°F at the start and 69°F by a typical finish. Rain fell during race hours in 2 of those years (2013 and 2021).

What was the hottest MO Cowbell Marathon?

Of the 13 years on record, 2023 was the warmest, reaching 82°F during race hours. The coldest start was 2026, at 36°F.

What was the windiest MO Cowbell Marathon?

Of the 13 years on record, 2013 was the windiest, with wind averaging 14 mph during race hours. The calmest was 2022, at 2 mph.

MO Cowbell Marathon weather history

Based on 13 years of data
Avg Temp
63°F
L:57° H:69°
RunScore
6
Conditions
Rain Freq
15%
2 of 13 yrs
Wind8mph
Dew52°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
partly-cloudy-day
36°/55°-
10
2025
clear-day
63°/80°-
4
2024
clear-day
67°/79°-
4
2023
clear-day
64°/82°-
4
2022
clear-day
52°/70°-
7
2021
cloudy
71°/75°Light
3
2019
partly-cloudy-day
61°/65°-
7
2018
fog
67°/82°-
3
2017
partly-cloudy-day
56°/70°-
7
2016
cloudy
61°/70°-
6
2015
cloudy
51°/56°-
9
2014
cloudy
48°/64°-
9
2013
clear-day
50°/54°Light
9