Running races in or near Mountainside, NJ
Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more
See below for a frequently-updated, comprehensive list of upcoming running events in the local Mountainside, NJ 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 - Youth
Organization: Keansburg High School
Date of Race: 11-15-2025
Description: The Titan 5k is a run/walk sponsored by the students and ...
View Race Details View on Map
Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-04-2025
Description: With the famous ...
View Race Details View on Map
Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-04-2025
Description: With the famous ...
View Race Details View on Map
Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 12-13-2025
Description: Tis the season to be running the Holiday ...
View Race Details View on Map
Running-5K - Individual Age group/open
Organization: Concrete Safaris
Date of Race: 10-25-2025
Description: The 2025 Hustle Strive 5K is a scenic Walk/Run ...
View Race Details View on Map
Running-5K - Individual Age group/open
Organization: Concrete Safaris
Date of Race: 10-25-2025
Description: The 2025 Hustle Strive 5K is a scenic Walk/Run ...
View Race Details View on Map
Running-5K - Individual Age group/open
Organization: Keansburg High School
Date of Race: 11-15-2025
Description: The Titan 5k is a run/walk sponsored by the students and ...
View Race Details View on Map
Running-1 Mile - Individual Age group/open
Organization: Du City Tri Runs, Inc.
Date of Race: 02-08-2026
Description: The JC Valentine's Half Marathon, 10K, 5K, 1 MILER ...
View Race Details View on Map
HALF MARATHON - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-15-2025
Description:
View Race Details View on Map
10K - Nov. 9 - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-09-2025
Description: Location: Prospect Park, Brooklyn, NYC Reference Address:
View Race Details View on Map
5K - Nov. 9 - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-09-2025
Description: Location: Prospect Park, Brooklyn, NYC Reference Address:
View Race Details View on Map
NOV 27 - HALF - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-27-2025
Description:
View Race Details View on Map
10K - Dec 6 - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 12-06-2025
Description: The seldom-seen Freedom Tunnel will echo with the sound of your ...
View Race Details View on Map
5K - RESIDENT or US CITIZEN - Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 08-30-2025
Description: Join us to run "The Hamilton" on Labor Day weekend in ...
View Race Details View on Map
DEC 14 - 10K - US Resident or ...
Organization: Du City Tri Runs, Inc.
Date of Race: 12-14-2025
Description: Join us to run "The Hamilton" on in Brooklyn, USA. This ...
View Race Details View on Map
OCT 12 - 10K - Individual Age group/open
Organization: Du City Tri Runs, Inc.
Date of Race: 10-12-2025
Description: Please always check our website: http://www.citytri.com for updates. Welcome to ...
View Race Details View on Map
OCT 12 - 5K - Individual Age group/open
Organization: Du City Tri Runs, Inc.
Date of Race: 10-12-2025
Description: Please always check our website: http://www.citytri.com for updates. Welcome to ...
View Race Details View on Map
Half - Oct 5 - 13.1 miles
Organization: Du City Tri Runs, Inc.
Date of Race: 10-05-2025
Description: The JC Green Half Marathon, 10K, 5K ...
View Race Details View on Map
Half - Feb 09 - 13.1 miles
Organization: Du City Tri Runs, Inc.
Date of Race: 02-08-2026
Description: The JC Valentine's Half Marathon, 10K, 5K, 1 MILER ...
View Race Details View on Map
Half Marathon - RESIDENT or US Citizen ...
Organization: Du City Tri Runs, Inc.
Date of Race: 08-30-2025
Description: Join us to run "The Hamilton" on Labor Day weekend in ...
View Race Details View on Map
Dec. 14 - Half Marathon - US Resident ...
Organization: Du City Tri Runs, Inc.
Date of Race: 12-14-2025
Description: Join us to run "The Hamilton" on in Brooklyn, USA. This ...
View Race Details View on Map
DEC 14 - 5K - US Resident or ...
Organization: Du City Tri Runs, Inc.
Date of Race: 12-14-2025
Description: Join us to run "The Hamilton" on in Brooklyn, USA. This ...
View Race Details View on Map
SATURDAY, AUGUST 23, 2025 - HALF - Individual ...
Organization: Du City Tri Runs, Inc.
Date of Race: 08-23-2025
Description:
View Race Details View on Map
10K - Feb 09 - 10k
Organization: Du City Tri Runs, Inc.
Date of Race: 02-08-2026
Description: The JC Valentine's Half Marathon, 10K, 5K, 1 MILER ...
View Race Details View on Map
Complete list of running events in and near Mountainside, NJ: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.
More information about Mountainside
About Mountainside
Mountainside (NJ) is a borough in Union County with an estimated population of 6,685.[4]
Races Local Newsletter
Subscribe to get the latest on racing delivered to your inbox, once per week.
Did you know?
In 2014, there were more than 1,100 marathons and more than 541,000 finishers in the U.S.
