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 ...
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Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 12-20-2026
Description: Tis the season to be running the Holiday ...
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Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-03-2026
Description: With the famous ...
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Running-Half marathon - Individual
Organization: Trimara Inc.
Date of Race: 10-03-2026
Description: With the famous ...
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CP-CE1 Running Club FRI
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CP-CE1 Running Club FRI
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CP-CE1 Running Club WED
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CP-CE1 Running Club WED
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CE2-CM1-CM2 Running Club FRI
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CE2-CM1-CM2 Running Club WED
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CE2-CM1-CM2 Running Club WED
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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CE2-CM1-CM2 Running Club FRI
Organization: Lycee Francais de New York
Date of Race: 09-08-2026
Description: Join Kicks Run Club and watch your child build confidence, endurance, ...
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5K - SEP 26 - Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 09-26-2026
Description: The seldom seen
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HALF MARATHON - July 12 - INTERNATIONAL - ...
Organization: Du City Tri Runs, Inc.
Date of Race: 07-12-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
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10K-July 12 - US Resident or Citizen-July 12
Organization: Du City Tri Runs, Inc.
Date of Race: 07-12-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
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5K-JULY 12 - INTERNATIONAL Participant - JULY 12
Organization: Du City Tri Runs, Inc.
Date of Race: 07-12-2026
Description: Run Course: Fort Hamilton Base or Virtual Course Reference ...
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5K - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-14-2026
Description: Event details and schedule
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The Holiday Half Marathon!
Organization: Trimara Inc.
Date of Race: 12-20-2026
Description: Tis the season to be running the Holiday ...
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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 ...
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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 ...
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10K-SEP 13 - 10K Individual
Organization: Du City Tri Runs, Inc.
Date of Race: 09-13-2026
Description: This course takes you through the natural beauty of ...
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Half - Oct 4 - 13.1 miles
Organization: Du City Tri Runs, Inc.
Date of Race: 10-04-2026
Description: The JC Green Half Marathon, 10K, 5K ...
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HALF MARATHON - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-14-2026
Description: Event details and schedule
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10K - Individual registration
Organization: Du City Tri Runs, Inc.
Date of Race: 11-14-2026
Description: Event details and schedule
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The New Yorker 10k, 5k @ Riverside Park
Organization: Du City Tri Runs, Inc.
Date of Race: 09-26-2026
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?
Historically, more marathons are run in the month of October than any other month (in the U.S.).
