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Races in Ontario, CA

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.

Road Runner Sports

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, ...

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, ...

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, ...

Running-5K - Individual Age group/open

Organization: ABWR

Date of Race: 10-12-2025

Description: It's time for our Runacopia 5k, 10k, 15k, Half ...

Running-10K - Individual Age group/open

Organization: ABWR

Date of Race: 10-12-2025

Description: It's time for our Runacopia 5k, 10k, 15k, Half ...

Running-15K - Individual Age group/open

Organization: ABWR

Date of Race: 10-12-2025

Description: It's time for our Runacopia 5k, 10k, 15k, Half ...

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, ...

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, ...

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, ...

Running-5K - Individual Age group/open

Organization: ABWR

Date of Race: 10-26-2025

Description: Come on out and join us for our Halloween ...

Running-10K - Individual Age group/open

Organization: ABWR

Date of Race: 10-26-2025

Description: Come on out and join us for our Halloween ...

Running-15K - Individual Age group/open

Organization: ABWR

Date of Race: 10-26-2025

Description: Come on out and join us for our Halloween ...

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, ...

Running-Half Marathon - Individual Age group/open

Organization: ABWR

Date of Race: 10-12-2025

Description: It's time for our Runacopia 5k, 10k, 15k, Half ...

Running-Half marathon - Individual Age group/open

Organization: ABWR

Date of Race: 10-26-2025

Description: Come on out and join us for our Halloween ...

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, ...

Bubble Run - Exclusive VIP Registration- Regular Price ...

Organization: Viral Run

Date of Race: 11-08-2025

Description: If you’ve done a traditional 5K, you know ...

Bubble Run - Exclusive VIP Registration- Regular Price ...

Organization: Viral Run

Date of Race: 07-19-2025

Description: If you’ve done a traditional 5K, you know they ...

Bubble Run - Value Registrations- Regular Price $54.95

Organization: Viral Run

Date of Race: 07-19-2025

Description: If you’ve done a traditional 5K, you know they ...

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, ...

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, ...

Halloween Hustle 5k, 10k, 15k, Half Marathon

Organization: ABWR

Date of Race: 10-26-2025

Description: Come on out and join us for our Halloween ...

Bubble Run | Pomona

Organization: Viral Run

Date of Race: 07-19-2025

Description: If you’ve done a traditional 5K, you know they ...

Runacopia 5k, 10k, 15k, Half Marathon

Organization: ABWR

Date of Race: 10-12-2025

Description: It's time for our Runacopia 5k, 10k, 15k, Half ...

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 ...

Fleet Feet Sports

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?

Historically, more marathons are run in the month of October than any other month (in the U.S.).

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