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: 03-22-2026
Description: Come on out and join us for the Spring Equinox 5k, ...
View Race Details View on Map
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, ...
View Race Details View on Map
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, ...
View Race Details View on Map
Running-5K - Individual Age group/open
Organization: ABWR
Date of Race: 01-04-2026
Description: It's time to Ring in the New Year 5k, 10k, 15k, ...
View Race Details View on Map
Running-15K - Individual Age group/open
Organization: ABWR
Date of Race: 01-04-2026
Description: It's time to Ring in the New Year 5k, 10k, 15k, ...
View Race Details View on Map
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, ...
View Race Details View on Map
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, ...
View Race Details View on Map
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, ...
View Race Details View on Map
Running-10K - Individual Age group/open
Organization: ABWR
Date of Race: 01-04-2026
Description: It's time to Ring in the New Year 5k, 10k, 15k, ...
View Race Details View on Map
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, ...
View Race Details View on Map
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 ...
View Race Details View on Map
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 ...
View Race Details View on Map
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 ...
View Race Details View on Map
Blacklight Run - Exclusive VIP Registration- R̶e̶g̶u̶l̶a̶r̶ P̶r̶i̶c̶e̶ ...
Organization: Viral Run
Date of Race: 08-29-2026
Description: The Blacklight Run™ is none other than the brightest, most fun ...
View Race Details View on Map
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 ...
View Race Details View on Map
Terrain Race | Irvine 2026
Organization: Viral Run
Date of Race: 11-21-2026
Description: Jump, climb, roll, and crawl your way through this one-of-a-kind obstacle ...
View Race Details View on Map
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, ...
View Race Details View on Map
Running-Half Marathon - Individual Age group/open
Organization: ABWR
Date of Race: 01-04-2026
Description: It's time to Ring in the New Year 5k, 10k, 15k, ...
View Race Details View on Map
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 ...
View Race Details View on Map
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 ...
View Race Details View on Map
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 ...
View Race Details View on Map
Ring in the New Year 5k, 10k, 15k, ...
Organization: ABWR
Date of Race: 01-04-2026
Description: It's time to Ring in the New Year 5k, 10k, 15k, ...
View Race Details View on Map
Bubble Run | Pomona
Organization: Viral Run
Date of Race: 08-29-2026
Description: If you’ve done a traditional 5K, you know they ...
View Race Details View on Map
Spring Equinox 5k, 10k, 15k, Half Marathon
Organization: ABWR
Date of Race: 03-22-2026
Description: Come on out and join us for the Spring Equinox 5k, ...
View Race Details View on Map
Bubble Run | Irvine 2026
Organization: Viral Run
Date of Race: 10-10-2026
Description: If you’ve done a traditional 5K, you know they ...
View Race Details View on Map
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]
Races Local Newsletter
Subscribe to get the latest on racing delivered to your inbox, once per week.
Did you know?
There were at least 768 marathons scheduled in the United States and Canada in 2016.
