Running races in or near Ontario, CA
Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more
See below for a frequently-updated, comprehensive list of upcoming running events in the local Ontario, CA 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.
Tacos N Beer 5k--Whittier Narrows Park - Individual ...
Organization: Runcarrera TEAM
Date of Race: 05-03-2025
Description: A 5k run like no other! Tacos ...
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Bubble Run - VIP Registration
Organization: Viral Run
Date of Race: 11-08-2025
Description: If you’ve done a traditional 5K, you know ...
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Bubble Run - Value Registrations
Organization: Viral Run
Date of Race: 11-08-2025
Description: If you’ve done a traditional 5K, you know ...
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Bubble Run - Standard Registration
Organization: Viral Run
Date of Race: 11-08-2025
Description: If you’ve done a traditional 5K, you know ...
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Tacos N' Beer 5k--May 3, 2025
Organization: Runcarrera TEAM
Date of Race: 05-03-2025
Description: A 5k run like no other! Tacos ...
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Bubble Run | Irvine | November 8th
Organization: Viral Run
Date of Race: 11-08-2025
Description: If you’ve done a traditional 5K, you know ...
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Tough Mudder Los Angeles 2025
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Rose Parade Floatfest 2025
Organization: City of Walnut
Date of Race: 01-02-2025
Description: DescriptionThe Rose Parade Floatfest features a 2-mile showcase of those big, ...
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2025 Wicked Wine Run Irvine, CA
Organization: Wicked Wine Run
Date of Race: 04-19-2025
Description: Whether you’re a seasoned runner or just love to walk and ...
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BOTH 5K + 1K! - Individual
Organization: Wicked Wine Run
Date of Race: 04-19-2025
Description: Whether you’re a seasoned runner or just love to walk and ...
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Saturday - April 5, 2025 - TM 15K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Saturday - April 5, 2025 - TM 15K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Saturday - April 5, 2025 - TM 5K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Saturday - April 5, 2025 - TM 5K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Sunday - April 6, 2025 - TM 5K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Sunday - April 6, 2025 - TM 5K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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1K TASTING WALK - Individual
Organization: Wicked Wine Run
Date of Race: 04-19-2025
Description: Whether you’re a seasoned runner or just love to walk and ...
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Saturday - April 5, 2025 - TM 15K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Sunday - April 6, 2025 - TM 15K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Volunteer then Run! - Individual
Organization: Wicked Wine Run
Date of Race: 04-19-2025
Description: Whether you’re a seasoned runner or just love to walk and ...
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Sunday - April 6, 2025 - Spectator & ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Saturday - April 5, 2025 - Spectator & ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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Saturday - April 5, 2025 - TM 5K ...
Organization: Tough Mudder US
Date of Race: 04-05-2025
Description: Tough Mudder is more than just an obstacle course. Built on ...
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5K WICKED WINE RUN - Individual
Organization: Wicked Wine Run
Date of Race: 04-19-2025
Description: Whether you’re a seasoned runner or just love to walk and ...
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Complete list of running events in and near Ontario, CA: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.
More information about Ontario
About Ontario
Ontario (CA) is a city in San Bernardino County with an estimated population of 163,924.[4]
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Did you know?
In 2014, 57% of marathon finishers in the U.S. were men; women made up 43% of finishers.
