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.
Running-5K - 15 And Under Youth
Organization: Turner Middle School
Date of Race: 05-02-2026
Description: All participants are welcome. Come challenge yourself to be the best.
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Running-5K - 16 and Older Adult Registration
Organization: Turner Middle School
Date of Race: 05-02-2026
Description: All participants are welcome. Come challenge yourself to be the best.
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Price
Organization: Colorado Track & Cross Country Camps
Date of Race: 07-06-2026
Description: All participants are welcome. Come challenge yourself to be the best.
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22nd Annual Bob Turner Classic 5K Run/Walk
Organization: Turner Middle School
Date of Race: 05-02-2026
Description: All participants are welcome. Come challenge yourself to be the best.
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Colorado Cross Country Summer Camp
Organization: Colorado Track & Cross Country Camps
Date of Race: 07-06-2026
Description: Nestled 5,430 feet above sea level, Boulder, Colorado is renowned as ...
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Muddy Dash - Exclusive VIP Registration - ...
Organization: Viral Run
Date of Race: 06-20-2026
Description: Muddy Dash is not your average mud run! Get ready for ...
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Muddy Dash - VALUE REGISTRATION - R̶e̶g̶u̶l̶a̶r̶ ...
Organization: Viral Run
Date of Race: 06-20-2026
Description: Muddy Dash is not your average mud run! Get ready for ...
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Muddy Dash | Denver 2026
Organization: Viral Run
Date of Race: 06-20-2026
Description: Muddy Dash is not your average mud run! Get ready for ...
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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! ...
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Adult White-Water Rafting
Organization: Commerce City Recreation Department
Date of Race: 06-06-2026
Description: DescriptionThis rafting trip will be a great time! This will be ...
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5k Race : Summer Sizzle : June
Organization: Fort Lupton Recreation Center
Date of Race: 06-13-2026
Description: DescriptionA certified 5k Race starts on South Harrison Avenue in front ...
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Ranger Roundtable - River Run Park
Organization: Commerce City Recreation Department
Date of Race: 07-24-2026
Description: DescriptionHave you tried finding one of our park rangers? Well look ...
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Elk Meadow 10k Trail Race - 5/30/26
Organization: Evergreen Park & Recreation District
Date of Race: 05-30-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Elk Meadow 5k Trail Race - 5/30/26
Organization: Evergreen Park & Recreation District
Date of Race: 05-30-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Bergen Peak Half Marathon Trail Race - 8/22/26
Organization: Evergreen Park & Recreation District
Date of Race: 08-22-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Snobahn Summer Training
Organization: Lake Eldora Racing
Date of Race: 06-01-2026
Description: We have recently changed the Snobahn options, please read the descriptions ...
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Bergen Peak 5k Trail Race - 8/22/26
Organization: Evergreen Park & Recreation District
Date of Race: 08-22-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Evergreen Trail Race Series 2026 (5k ONLY Package ...
Organization: Evergreen Park & Recreation District
Date of Race: 05-30-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Lucky Day Out: Casino Excursion
Organization: Evergreen Park & Recreation District
Date of Race: 08-20-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Evergreen Trail Race Series 2026 (Ext Distance Package ...
Organization: Evergreen Park & Recreation District
Date of Race: 05-30-2026
Description: DescriptionInternet Registration has not begun yet. Check Registration Dates in ...
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Little Dribblers Camp I
Organization: Colorado Womens Basketball
Date of Race: 06-15-2026
Description: Little Dribblers Camp is for the first time camper or a ...
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Price
Organization: Colorado Womens Basketball
Date of Race: 06-15-2026
Description: Little Dribblers Camp is for the first time camper or a ...
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Individual Camp I
Organization: Colorado Womens Basketball
Date of Race: 06-15-2026
Description: Individual Camp is a great opportunity for any player looking to ...
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Price
Organization: Colorado Womens Basketball
Date of Race: 06-15-2026
Description: Individual Camp is a great opportunity for any player looking to ...
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<< SELECT SESSION
Organization: Mighty Movement
Date of Race: 06-22-2026
Description: Individual Camp is a great opportunity for any player looking to ...
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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]
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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.).
