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.
Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 03-01-2026
Description: It's time for our March Magic 5k, 10k, 15k, ...
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Running-Half Marathon - Individual Age group/open
Organization: ABWR
Date of Race: 03-01-2026
Description: It's time for our March Magic 5k, 10k, 15k, ...
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Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 04-26-2026
Description: It's time for our Wildflower 5k, 10k, 15k, Half ...
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Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 04-26-2026
Description: It's time for our Wildflower 5k, 10k, 15k, Half ...
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Running-Half Marathon - Individual Age group/open
Organization: ABWR
Date of Race: 04-26-2026
Description: It's time for our Wildflower 5k, 10k, 15k, Half ...
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Wildflower 5k, 10k, 15k, Half Marathon
Organization: ABWR
Date of Race: 04-26-2026
Description: It's time for our Wildflower 5k, 10k, 15k, Half ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 04-26-2026
Description: It's time for our Wildflower 5k, 10k, 15k, Half ...
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Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 03-01-2026
Description: It's time for our March Magic 5k, 10k, 15k, ...
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March Magic 5k, 10k, 15k, Half Marathon
Organization: ABWR
Date of Race: 03-01-2026
Description: It's time for our March Magic 5k, 10k, 15k, ...
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Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 03-22-2026
Description: Come on out and join us for the Spring Equinox 5k, ...
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Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 03-22-2026
Description: Come on out and join us for the Spring Equinox 5k, ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 03-01-2026
Description: It's time for our March Magic 5k, 10k, 15k, ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 03-22-2026
Description: Come on out and join us for the Spring Equinox 5k, ...
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Bubble Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...
Organization: Viral Run
Date of Race: 10-10-2026
Description: If you’ve done a traditional 5K, you know they ...
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Running-Half marathon - Individual Age group/open
Organization: ABWR
Date of Race: 03-22-2026
Description: Come on out and join us for the Spring Equinox 5k, ...
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Muddy Dash | Irvine 2026
Organization: Viral Run
Date of Race: 03-28-2026
Description: Muddy Dash is not your average mud run! Get ready for ...
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Bubble Run | Pomona 2026
Organization: Viral Run
Date of Race: 08-29-2026
Description: If you’ve done a traditional 5K, you know they ...
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Bubble Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶
Organization: Viral Run
Date of Race: 10-10-2026
Description: If you’ve done a traditional 5K, you know they ...
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Bubble Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶
Organization: Viral Run
Date of Race: 08-29-2026
Description: If you’ve done a traditional 5K, you know they ...
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Terrain Race - Exclusive VIP Registration - R̶e̶g̶u̶l̶a̶r̶ ...
Organization: Viral Run
Date of Race: 11-21-2026
Description: Jump, climb, roll, and crawl your way through this one-of-a-kind obstacle ...
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Muddy Dash - VALUE REGISTRATION - R̶e̶g̶u̶l̶a̶r̶ ...
Organization: Viral Run
Date of Race: 03-28-2026
Description: Muddy Dash is not your average mud run! Get ready for ...
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Muddy Dash - Exclusive VIP Registration - ...
Organization: Viral Run
Date of Race: 03-28-2026
Description: Muddy Dash is not your average mud run! Get ready for ...
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Terrain Race - Value Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶7̶4.9̶5̶
Organization: Viral Run
Date of Race: 11-21-2026
Description: Jump, climb, roll, and crawl your way through this one-of-a-kind obstacle ...
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Bubble Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...
Organization: Viral Run
Date of Race: 08-29-2026
Description: If you’ve done a traditional 5K, you know they ...
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Blacklight Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶
Organization: Viral Run
Date of Race: 08-29-2026
Description: The Blacklight Run™ is none other than the brightest, most fun ...
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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 2015, the 5K maintained the #1 position of all race distances with 7.6 million finishers (U.S.).
