Running races in or near Clayton, MO
Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more
See below for a frequently-updated, comprehensive list of upcoming running events in the local Clayton, MO area. Races listed here include both walking and running events of various distances — from 1-milers, to 5Ks, to marathons, and everything else in between.
Cross-Country Running-5K - 12 - 18
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Cross-Country Running-5K - Under 11
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Cross-Country Running-5K - Over 18
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Open Virtual Running - 19 and Older - ...
Organization: Collinsville Police Department Special Olympics
Date of Race: 07-26-2025
Description: Join the 5-O 5K Donut Run for a Sweet Cause! 🍩🏃♂️ ...
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Junior 5-O 5K Run/Walk - 0-18 - Junior ...
Organization: Collinsville Police Department Special Olympics
Date of Race: 07-26-2025
Description: Join the 5-O 5K Donut Run for a Sweet Cause! 🍩🏃♂️ ...
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Cross-Country Running-1 Mile Fun Run - 12 - ...
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Cross-Country Running-1 Mile Fun Run - Over 18
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Junior Virtual 5K - 0-18 - Individual Age ...
Organization: Collinsville Police Department Special Olympics
Date of Race: 07-26-2025
Description: Join the 5-O 5K Donut Run for a Sweet Cause! 🍩🏃♂️ ...
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Cross-Country Running-1 Mile Fun Run - Under 11
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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5k Teams - Men's 5K Team
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Mud Mountain XXIX 5K Classic and Mile Fun ...
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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10th Annual 5-O 5K Donut Run/Walk for Special ...
Organization: Collinsville Police Department Special Olympics
Date of Race: 07-26-2025
Description: Join the 5-O 5K Donut Run for a Sweet Cause! 🍩🏃♂️ ...
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5k Teams - Women's 5K Team
Organization: Edwardsville Cross-Country and Track and Field Booster Club
Date of Race: 07-26-2025
Description: THIS IS NOT A "MUD" RACE! The 29th Annual Mud Mountain ...
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Open 5-O 5K Run/Walk - 19 and OIder ...
Organization: Collinsville Police Department Special Olympics
Date of Race: 07-26-2025
Description: Join the 5-O 5K Donut Run for a Sweet Cause! 🍩🏃♂️ ...
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*CANCELLED* Missouri 2025
Organization: Tough Mudder US
Date of Race: 08-16-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Puzzle Palooza - Seashell Scramble
Organization: City of Belleville
Date of Race: 07-09-2025
Description: DescriptionGrab your friends & family and join us for our next ...
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Candy Rush Run
Organization: City of Belleville
Date of Race: 08-16-2025
Description: DescriptionCalling all young runners! Join us for our very first Youth-Only ...
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Running-5K - Individual Age group/open
Organization: O'Fallon's Habitat For Humanity
Date of Race: 10-25-2025
Description: Event details and schedule
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Howling Habitat 5K
Organization: O'Fallon's Habitat For Humanity
Date of Race: 10-25-2025
Description: Event details and schedule
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Walking-1K - Individual Age group/open
Organization: O'Fallon's Habitat For Humanity
Date of Race: 10-25-2025
Description: Event details and schedule
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Complete list of running events in and near Clayton, MO: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.
More information about Clayton
About Clayton
Clayton (MO) is a city in Saint Louis County with an estimated population of 15,939.[4]
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In 2015, the 5K maintained the #1 position of all race distances with 7.6 million finishers (U.S.).