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Races in Milliken, CO

Running races in or near Milliken, CO

Marathons, 1-milers, 5Ks, half-marathons, 10Ks & more

See below for a frequently-updated, comprehensive list of upcoming running events in the local Milliken, 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.

Road Runner Sports

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 ...

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 ...

Muddy Dash - Exclusive VIP Registration - ...

Organization: Viral Run

Date of Race: 09-13-2025

Description: Muddy Dash is not your average mud run! Get ready for ...

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 ...

Muddy Dash | Denver

Organization: Viral Run

Date of Race: 09-13-2025

Description: Muddy Dash is not your average mud run! Get ready for ...

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 ...

Muddy Dash - VALUE REGISTRATION - R̶e̶g̶u̶l̶a̶r̶ ...

Organization: Viral Run

Date of Race: 09-13-2025

Description: Muddy Dash is not your average mud run! Get ready for ...

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 ...

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 ...

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 ...

Running-5K - Individual Age group/open

Organization: Gnar Runners 2015

Date of Race: 12-31-2025

Description: Run out the old year, and welcome the new! Now in ...

Running-Trail-Marathon - Individual Age group/open

Organization: Gnar Runners 2015

Date of Race: 10-18-2025

Description: Taking place on the trails between Horsetooth Mountain Park and the ...

Running-Half marathon - Individual Age group/open

Organization: Gnar Runners 2015

Date of Race: 10-18-2025

Description: Taking place on the trails between Horsetooth Mountain Park and the ...

Blue Sky Marathon & Half

Organization: Gnar Runners 2015

Date of Race: 10-18-2025

Description: Taking place on the trails between Horsetooth Mountain Park and the ...

Running-Half marathon - Individual Age group/open

Organization: Gnar Runners 2015

Date of Race: 09-06-2025

Description: The Black Squirrel Trail Half Marathon takes place on the wonderful ...

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 ...

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 ...

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 ...

Black Squirrel Half Marathon

Organization: Gnar Runners 2015

Date of Race: 09-06-2025

Description: The Black Squirrel Trail Half Marathon takes place on the wonderful ...

Resolution Run 5K

Organization: Gnar Runners 2015

Date of Race: 12-31-2025

Description: Run out the old year, and welcome the new! Now in ...

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 ...

Day Off Discovery Camp: Park Discovery Day

Organization: Thompson Rivers Parks and Recreation District

Date of Race: 08-22-2025

Description: DescriptionGet ready to explore! In this Park Adventure edition of Day ...

Day Off Discovery Camp: Park Discovery Day

Organization: Thompson Rivers Parks and Recreation District

Date of Race: 08-22-2025

Description: DescriptionGet ready to explore! In this Park Adventure edition of Day ...

Day Off Discovery Camp: Park Discovery Day

Organization: Thompson Rivers Parks and Recreation District

Date of Race: 08-22-2025

Description: DescriptionGet ready to explore! In this Park Adventure edition of Day ...

FitnessMatchmaker.com

Complete list of running events in and near Milliken, CO: Marathons, 1-milers, 5Ks, half-marathons, 10Ks, obstacle courses, walking events & more.


More information about Milliken

About Milliken

Milliken (CO) is a town in Weld County with an estimated population of 5,610.[4]

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In 2014, there were more than 1,100 marathons and more than 541,000 finishers in the U.S.

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