Races LocalRaces Local
Find Local Running Races
Races in Boulder, CO

Running races in or near Boulder, CO

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

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

FitnessMatchmaker.com

2026 Eerie Erie

Organization: Optimist Club of Erie, Colorado

Date of Race: 10-31-2026

Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...

Bergen Peak Half Marathon Trail Race - 8/22/26

Organization: Evergreen Park & Recreation District

Date of Race: 08-22-2026

Description: DescriptionCome run with us in beautiful Evergreen to the top of ...

16 and under 10K - Individual Age group/open

Organization: Optimist Club of Erie, Colorado

Date of Race: 10-31-2026

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: 10-31-2026

Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...

16 and under 5K - Individual Age group/open

Organization: Optimist Club of Erie, Colorado

Date of Race: 10-31-2026

Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...

Adult (17+) 5K - Individual Age group/open

Organization: Optimist Club of Erie, Colorado

Date of Race: 10-31-2026

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: 10-31-2026

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: 10-31-2026

Description: The world-famous Eerie Erie is a Halloweenthemed 5k and ...

Puzzling Competition

Organization: Commerce City Recreation Department

Date of Race: 08-27-2026

Description: DescriptionPut your problem-solving skills to the test in this exciting puzzlingcompetition! ...

Mack Cross Country Team with Coach Mike

Organization: Mackintosh Academy Boulder

Date of Race: 08-25-2026

Description: Join our Mack Cross Country Team for the Fall season! Practices ...

Lucky Day Out: Casino Excursion

Organization: Evergreen Park & Recreation District

Date of Race: 08-20-2026

Description: DescriptionFeeling Lucky this summer? Finding yourself in the mood for ...

Bergen Peak 5k Trail Race - 8/22/26

Organization: Evergreen Park & Recreation District

Date of Race: 08-22-2026

Description: DescriptionCome run with us in beautiful Evergreen to the top of ...

Race to the Shield Homecoming Run

Organization: Berthoud High Boosters

Date of Race: 09-26-2026

Description: 1st Annual Race to the Shield Homecoming ...

Active Adults Anderson Farms Fall Excursion

Organization: Evergreen Park & Recreation District

Date of Race: 10-22-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Turkey Burn

Organization: Fort Lupton Recreation Center

Date of Race: 11-26-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Run with the Buffalo Fun Run: 5K Distance

Organization: Commerce City Recreation Department

Date of Race: 12-05-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Run with the Buffalo Fun Run: 2.5 Mile ...

Organization: Commerce City Recreation Department

Date of Race: 12-05-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Giants of the Plains Nature Walk

Organization: Commerce City Recreation Department

Date of Race: 11-15-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Walk to End Alzheimer's (9/19)

Organization: Commerce City Recreation Department

Date of Race: 09-19-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Wildland Firefighter Safety

Organization: Commerce City Recreation Department

Date of Race: 09-09-2026

Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...

Week 11 | Ages 12-15 | 10am-2pm @ ...

Organization: Mighty Movement

Date of Race: 08-10-2026

Description: LOUISVILLE'S BEST ACTIVE SUMMER CAMP: Get Outside, Work Hard, Have Fun! ...

<< SELECT SESSION

Organization: Mighty Movement

Date of Race: 08-10-2026

Description: LOUISVILLE'S BEST ACTIVE SUMMER CAMP: Get Outside, Work Hard, Have Fun! ...

YS: Girls Flag Football Camp 9-14 @ Valverde

Organization: City and County of Denver

Date of Race: 08-15-2026

Description: DescriptionThis camp is designed to introduce the fundamentals of the game, ...

YS: Girls Flag Football Camp 9-14 @ Valverde

Organization: City and County of Denver

Date of Race: 08-15-2026

Description: DescriptionThis camp is designed to introduce the fundamentals of the game, ...

YS: Girls Flag Football Camp 9-14 @ Valverde

Organization: City and County of Denver

Date of Race: 08-15-2026

Description: DescriptionThis camp is designed to introduce the fundamentals of the game, ...

Road Runner Sports

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


More information about Boulder

About Boulder

Boulder (CO) is a city in Boulder County with an estimated population of 97,385.[4]

Races Local Newsletter

Subscribe to get the latest on racing delivered to your inbox, once per week.

Did you know?

There were at least 768 marathons scheduled in the United States and Canada in 2016.

ZIP Codes in CO


Go

Other Colorado Cities