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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.

Lock Laces

Running-15K - Individual Age group/open

Organization: ABWR

Date of Race: 03-30-2025

Description: ABWR has teamed up with two local charities to help with ...

Running-10K - Individual Age group/open

Organization: ABWR

Date of Race: 03-30-2025

Description: ABWR has teamed up with two local charities to help with ...

Running-5K - Individual Age group/open

Organization: ABWR

Date of Race: 03-30-2025

Description: ABWR has teamed up with two local charities to help with ...

Bubble Run - VIP Registration

Organization: Viral Run

Date of Race: 07-19-2025

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

Bubble Run | Pomona

Organization: Viral Run

Date of Race: 07-19-2025

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

La Habra Run 50-Yard Diaper Dash Runners

Organization: City of La Habra Community Services Department

Date of Race: 03-08-2025

Description: DescriptionThe La Habra Races Registration is now closed. You can still ...

La Habra Run 1K Kiddy Runners

Organization: City of La Habra Community Services Department

Date of Race: 03-08-2025

Description: DescriptionThe La Habra Races Registration is now closed. You can still ...

La Habra Run 5K Runners

Organization: City of La Habra Community Services Department

Date of Race: 03-08-2025

Description: DescriptionThe La Habra Races Registration is now closed. You can still ...

Bubble Run - Value Registrations

Organization: Viral Run

Date of Race: 07-19-2025

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

La Habra Run 1K Kiddy Runners

Organization: City of La Habra Community Services Department

Date of Race: 03-08-2025

Description: DescriptionThe La Habra Races Registration is now closed. You can still ...

Bubble Run - Standard Registration

Organization: Viral Run

Date of Race: 07-19-2025

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

Running-Half marathon - Individual Age group/open

Organization: ABWR

Date of Race: 03-30-2025

Description: ABWR has teamed up with two local charities to help with ...

Bubble Run - VIP Registration

Organization: Viral Run

Date of Race: 11-08-2025

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

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 ...

Bubble Run - Standard Registration

Organization: Viral Run

Date of Race: 11-08-2025

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

Bubble Run - Value Registrations

Organization: Viral Run

Date of Race: 11-08-2025

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

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 ...

Phoenix Rising 5k, 10k, 15k, Half Marathon

Organization: ABWR

Date of Race: 03-30-2025

Description: ABWR has teamed up with two local charities to help with ...

Bubble Run | Irvine

Organization: Viral Run

Date of Race: 11-08-2025

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

Tacos N' Beer 5k--May 3, 2025

Organization: Runcarrera TEAM

Date of Race: 05-03-2025

Description: A 5k run like no other! Tacos ...

2025 Adaptive Sports Fair Registration

Organization: Rancho Cucamonga Community Services

Date of Race: 06-14-2025

Description: DescriptionThe 3rd Annual Adaptive Sports Fair will take place on Saturday, ...

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 ...

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 ...

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 ...

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 ...

Lock Laces

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.

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