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 - Adults
Organization: Lt. Dennis W. Zilinski, II Memorial Fund
Date of Race: 11-09-2025
Description: The 20th Annual Run With Dennis event is at the hills ...
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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 ...
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Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-04-2025
Description: With the famous ...
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Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-04-2025
Description: With the famous ...
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Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 12-13-2025
Description: Tis the season to be running the Holiday ...
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Running-5K - 18 and Under
Organization: Lt. Dennis W. Zilinski, II Memorial Fund
Date of Race: 11-09-2025
Description: The 20th Annual Run With Dennis event is at the hills ...
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Running-Kid Run - Kid Fun Run
Organization: Special Event Services
Date of Race: 11-27-2025
Description: đ 10th Annual Run Your Giblets Off ...
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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 ...
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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 ...
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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 ...
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Running-Half marathon - Individual Age group/open
Organization: Trimara Inc.
Date of Race: 09-21-2025
Description: The Race Guys decided that Prospect Park ...
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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 ...
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5K - 5K Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 12-07-2025
Description: This course takes you through the natural beauty of ...
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NOV 27 - 10K - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-27-2025
Description:
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NOV 27 ⢠5K - Individual Age group/open
Organization: Du City Tri Runs, Inc.
Date of Race: 11-27-2025
Description:
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The Holiday Half Marathon!
Organization: Trimara Inc.
Date of Race: 12-13-2025
Description: Tis the season to be running the Holiday ...
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HALF MARATHON - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-15-2025
Description:
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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:
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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:
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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 ...
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NOV 27 - HALF - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-27-2025
Description:
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The Prospect Park Half Marathon!
Organization: Trimara Inc.
Date of Race: 09-21-2025
Description: The Race Guys decided that Prospect Park ...
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10K - SEP 27 - Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 09-27-2025
Description: The seldom seen
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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]
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Did you know?
In 2015, the 5K maintained the #1 position of all race distances with 7.6 million finishers (U.S.).
