Running races in or near Longmont, CO
Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more
See below for a frequently-updated, comprehensive list of upcoming running events in the local Longmont, CO 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.
Senior (60+) 5K - Individual Age group/open
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
Senior (60+) 10K - Individual Age group/open
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
16 and under 10K - Individual Age group/open
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
Adult (17+) 5K - Individual Age group/open
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
Adult (17+) 10K - Individual Age group/open
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
16 and under 5K - Individual Age group/open
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
2025 Eerie Erie
Organization: Optimist Club of Erie, Colorado
Date of Race: 10-25-2025
Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...
View Race Details View on Map
Colorado 24 Hour Run
Organization: Gnar Runners 2015
Date of Race: 11-01-2025
Description: Welcome to the Colorado 24 Hour Run! We aim to provide ...
View Race Details View on Map
24 Hour - Individual Age group/open
Organization: Gnar Runners 2015
Date of Race: 11-01-2025
Description: Welcome to the Colorado 24 Hour Run! We aim to provide ...
View Race Details View on Map
12 Hour - Individual Age group/open
Organization: Gnar Runners 2015
Date of Race: 11-01-2025
Description: Welcome to the Colorado 24 Hour Run! We aim to provide ...
View Race Details View on Map
6 Hour - Individual Age group/open
Organization: Gnar Runners 2015
Date of Race: 11-01-2025
Description: Welcome to the Colorado 24 Hour Run! We aim to provide ...
View Race Details View on Map
Youth Basketball League-Grade 5-6 (Girls)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League-Grade 5-6 (Girls)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League-Grade 5-6 (Girls)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League-Grade 5-6 (Boys)
Organization: Commerce City Recreation Department
Date of Race: 01-05-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League -Grade 3-4 (Boys)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League-Grade 5-6 (Boys)
Organization: Commerce City Recreation Department
Date of Race: 01-05-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League -Grade 3-4 (Boys)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League -Grade 3-4 (Girls)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League -Grade 3-4 (Girls)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League -Grade 3-4 (Boys)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League -Grade 3-4 (Girls)
Organization: Commerce City Recreation Department
Date of Race: 01-10-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Youth Basketball League-Grade 5-6 (Boys)
Organization: Commerce City Recreation Department
Date of Race: 01-05-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
View Race Details View on Map
Complete list of running events in and near Longmont, CO: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.
More information about Longmont
About Longmont
Longmont (CO) is a city in Boulder County with an estimated population of 86,270.[4]
Races Local Newsletter
Subscribe to get the latest on racing delivered to your inbox, once per week.
Did you know?
Historically, more marathons are run in the month of October than any other month (in the U.S.).
