Running races in or near Thornton, CO
Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more
See below for a frequently-updated, comprehensive list of upcoming running events in the local Thornton, 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.
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
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 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+) 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
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
Run with the Buffalo Fun Run: 2.5 Mile ...
Organization: Commerce City Recreation Department
Date of Race: 12-06-2025
Description: DescriptionJoin us for our annual Run with the Buffalo Ugly ...
View Race Details View on Map
Run with the Buffalo Fun Run: 5K Distance
Organization: Commerce City Recreation Department
Date of Race: 12-06-2025
Description: DescriptionJoin us for our annual Run with the Buffalo ...
View Race Details View on Map
Price
Organization: Valor Christian High School
Date of Race: 09-16-2025
Description: DescriptionJoin us for our annual Run with the Buffalo ...
View Race Details View on Map
2025 Fall Cheer - Valor Mini Cheer Clinic
Organization: Valor Christian High School
Date of Race: 09-16-2025
Description: Please join us for our annual Valor Mini Cheer camp the ...
View Race Details View on Map
Soccer Tots by SuperTots Sports 3yrs to 3yrs ...
Organization: Commerce City Recreation Department
Date of Race: 10-24-2025
Description: DescriptionSoccerTots is our flagship program! ...
View Race Details View on Map
Soccer Tots by SuperTots Sports 2yrs to 2yrs ...
Organization: Commerce City Recreation Department
Date of Race: 10-24-2025
Description: DescriptionSoccerTots is our flagship program! ...
View Race Details View on Map
Soccer Tots by SuperTots Sports 2yrs to 2yrs ...
Organization: Commerce City Recreation Department
Date of Race: 10-24-2025
Description: DescriptionSoccerTots is our flagship program! ...
View Race Details View on Map
Soccer Tots by SuperTots Sports 2yrs to 2yrs ...
Organization: Commerce City Recreation Department
Date of Race: 10-24-2025
Description: DescriptionSoccerTots is our flagship program! ...
View Race Details View on Map
Soccer Tots by SuperTots Sports 3yrs to 3yrs ...
Organization: Commerce City Recreation Department
Date of Race: 10-24-2025
Description: DescriptionSoccerTots is our flagship program! ...
View Race Details View on Map
Soccer Tots by SuperTots Sports 3yrs to 3yrs ...
Organization: Commerce City Recreation Department
Date of Race: 10-24-2025
Description: DescriptionSoccerTots is our flagship program! ...
View Race Details View on Map
Soccer Tots by SuperTots 2yrs to 2yrs 11m ...
Organization: Commerce City Recreation Department
Date of Race: 10-17-2025
Description: DescriptionSoccerTots is our flagship program! Our classes ...
View Race Details View on Map
Soccer Tots by SuperTots 2yrs to 2yrs 11m ...
Organization: Commerce City Recreation Department
Date of Race: 10-17-2025
Description: DescriptionSoccerTots is our flagship program! Our classes ...
View Race Details View on Map
Soccer Tots by SuperTots 3yrs to 3yrs 11m ...
Organization: Commerce City Recreation Department
Date of Race: 10-17-2025
Description: DescriptionSoccerTots is our flagship program! Our classes ...
View Race Details View on Map
Soccer Tots by SuperTots 2yrs to 2yrs 11m ...
Organization: Commerce City Recreation Department
Date of Race: 10-17-2025
Description: DescriptionSoccerTots is our flagship program! Our classes ...
View Race Details View on Map
Soccer Tots by SuperTots 3yrs to 3yrs 11m ...
Organization: Commerce City Recreation Department
Date of Race: 10-17-2025
Description: DescriptionSoccerTots is our flagship program! Our classes ...
View Race Details View on Map
Soccer Tots by SuperTots 3yrs to 3yrs 11m ...
Organization: Commerce City Recreation Department
Date of Race: 10-17-2025
Description: DescriptionSoccerTots is our flagship program! Our classes ...
View Race Details View on Map
'26 Spring Early Ball Skills (2.5-3 year olds)
Organization: Altitude All Sports
Date of Race: 04-06-2026
Description: This 7-week program (Mondays, 4/6 to 5/18) provides little ones and ...
View Race Details View on Map
Run with the Buffalo Fun Run: 2.5 Mile ...
Organization: Commerce City Recreation Department
Date of Race: 12-06-2025
Description: DescriptionJoin us for our annual Run with the Buffalo Ugly ...
View Race Details View on Map
Complete list of running events in and near Thornton, CO: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.
More information about Thornton
About Thornton
Thornton (CO) is a city in Adams County with an estimated population of 118,772.[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.).
