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-5K - Individual Age group/open
Organization: ABWR
Date of Race: 12-21-2025
Description: It's time for our Reindeer Run 5k, 10k, 15k, ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 12-21-2025
Description: It's time for our Reindeer Run 5k, 10k, 15k, ...
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Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 10-12-2025
Description: It's time for our Haunted Heroes 5k, 10k, 15k, ...
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Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 10-12-2025
Description: It's time for our Haunted Heroes 5k, 10k, 15k, ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 10-12-2025
Description: It's time for our Haunted Heroes 5k, 10k, 15k, ...
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Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 09-07-2025
Description: It's time for our Hot to Trot 5k, 10k, ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 10-26-2025
Description: Come on out and join us for our Monster ...
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Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 09-07-2025
Description: It's time for our Hot to Trot 5k, 10k, ...
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Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 09-07-2025
Description: It's time for our Hot to Trot 5k, 10k, ...
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Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 10-26-2025
Description: Come on out and join us for our Monster ...
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Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 10-26-2025
Description: Come on out and join us for our Monster ...
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Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 12-21-2025
Description: It's time for our Reindeer Run 5k, 10k, 15k, ...
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Running-Half Marathon - Individual Age group/open
Organization: ABWR
Date of Race: 12-21-2025
Description: It's time for our Reindeer Run 5k, 10k, 15k, ...
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Running-Half marathon - Individual Age group/open
Organization: ABWR
Date of Race: 10-26-2025
Description: Come on out and join us for our Monster ...
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Bubble Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...
Organization: Viral Run
Date of Race: 11-15-2025
Description: If you’ve done a traditional 5K, you know ...
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Running-Half Marathon - Individual Age group/open
Organization: ABWR
Date of Race: 09-07-2025
Description: It's time for our Hot to Trot 5k, 10k, ...
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Running-Half Marathon - Individual Age group/open
Organization: ABWR
Date of Race: 10-12-2025
Description: It's time for our Haunted Heroes 5k, 10k, 15k, ...
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Monster Dash 5k, 10k, 15k, Half Marathon YL
Organization: ABWR
Date of Race: 10-26-2025
Description: Come on out and join us for our Monster ...
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Reindeer Run 5k, 10k, 15k, Half Marathon
Organization: ABWR
Date of Race: 12-21-2025
Description: It's time for our Reindeer Run 5k, 10k, 15k, ...
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Hot to Trot 5k, 10k, 15k, Half Marathon
Organization: ABWR
Date of Race: 09-07-2025
Description: It's time for our Hot to Trot 5k, 10k, ...
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Haunted Heroes 5k, 10k, 15k, Half Marathon
Organization: ABWR
Date of Race: 10-12-2025
Description: It's time for our Haunted Heroes 5k, 10k, 15k, ...
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Bubble Run - Value Registrations- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ $̶5̶4̶.̶9̶5̶
Organization: Viral Run
Date of Race: 11-15-2025
Description: If you’ve done a traditional 5K, you know ...
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Bubble Run | Irvine
Organization: Viral Run
Date of Race: 11-15-2025
Description: If you’ve done a traditional 5K, you know ...
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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?
There were at least 768 marathons scheduled in the United States and Canada in 2016.
