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-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-03-2026
Description: With the famous ...
View Race Details View on Map
Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 12-20-2026
Description: Tis the season to be running the Holiday ...
View Race Details View on Map
Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-03-2026
Description: With the famous ...
View Race Details View on Map
Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-03-2026
Description: With the famous ...
View Race Details View on Map
Running-Half marathon - Individual Age group/open
Organization: Trimara Inc.
Date of Race: 09-20-2026
Description: The Race Guys decided that Prospect Park ...
View Race Details View on Map
The Brooklyn Fall Half
Organization: Du City Tri Runs, Inc.
Date of Race: 11-08-2026
Description: Brooklyn is NYC’s most populous borough and has a rich running ...
View Race Details View on Map
Jersey City Summer Half, 10K, 5K 2026
Organization: Du City Tri Runs, Inc.
Date of Race: 08-16-2026
Description: We are proud and excited to hold the First ...
View Race Details View on Map
The JC Green Fall Half lMarathon, 10k, 5k ...
Organization: Du City Tri Runs, Inc.
Date of Race: 10-04-2026
Description: The JC Green Half Marathon, 10K, 5K ...
View Race Details View on Map
The Big Turkey Half Marathon, 10k, 5k 2026
Organization: Du City Tri Runs, Inc.
Date of Race: 11-26-2026
Description:
View Race Details View on Map
HALF - 13.1 Miler Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 06-21-2026
Description: This course takes you through the natural beauty of ...
View Race Details View on Map
VIRTUAL ONLY - HALF - Individual Age group/open
Organization: Du City Tri Runs, Inc.
Date of Race: 06-21-2026
Description: This course takes you through the natural beauty of ...
View Race Details View on Map
10K - Nov. 8 - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-08-2026
Description: Brooklyn is NYC’s most populous borough and has a rich running ...
View Race Details View on Map
5K - Oct 4 - 5k
Organization: Du City Tri Runs, Inc.
Date of Race: 10-04-2026
Description: The JC Green Half Marathon, 10K, 5K ...
View Race Details View on Map
HALF - Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 08-16-2026
Description: We are proud and excited to hold the First ...
View Race Details View on Map
NOV 26 • 5K - Individual Age group/open
Organization: Du City Tri Runs, Inc.
Date of Race: 11-26-2026
Description:
View Race Details View on Map
10K-July 12 - INTERNATIONAL Participant: Individual - JULY ...
Organization: Du City Tri Runs, Inc.
Date of Race: 07-12-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
View Race Details View on Map
HALF MARATHON -May 31 - US Resident or ...
Organization: Du City Tri Runs, Inc.
Date of Race: 05-31-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
View Race Details View on Map
HALF MARATHON -May 31 - INTERNATIONAL -May 31
Organization: Du City Tri Runs, Inc.
Date of Race: 05-31-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
View Race Details View on Map
The New Yorker 10k, 5k @ Riverside Park
Organization: Du City Tri Runs, Inc.
Date of Race: 09-26-2026
Description: The seldom seen
View Race Details View on Map
The Brooklynite Fall 10K & 5K
Organization: Du City Tri Runs, Inc.
Date of Race: 10-11-2026
Description: Please always check our website: http://www.citytri.com for updates. Welcome to ...
View Race Details View on Map
The Bay Ridge Half Marathon!
Organization: Trimara Inc.
Date of Race: 10-03-2026
Description: With the famous ...
View Race Details View on Map
The NJ Fall Endurance Classic Half Marathon, 10k, ...
Organization: Du City Tri Runs, Inc.
Date of Race: 09-13-2026
Description: This course takes you through the natural beauty of ...
View Race Details View on Map
The Brooklynite Summer Half, 10K & 5K
Organization: Du City Tri Runs, Inc.
Date of Race: 07-12-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
View Race Details View on Map
The NJ Endurance Classic Half Marathon, 10k, 5k
Organization: Du City Tri Runs, Inc.
Date of Race: 06-21-2026
Description: This course takes you through the natural beauty of ...
View Race Details View on Map
Memorial Day Half Marathon, 10k, 5k
Organization: Du City Tri Runs, Inc.
Date of Race: 05-31-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
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?
There were at least 768 marathons scheduled in the United States and Canada in 2016.
