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.
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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Bright Nights at Four Mile Historic Park
Organization: Fort Lupton Recreation Center
Date of Race: 10-28-2026
Description: Age GroupSeniors
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Turkey Burn
Organization: Fort Lupton Recreation Center
Date of Race: 11-26-2026
Description: DescriptionStart your Thanksgiving the right Way! Join us for a ...
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Run with the Buffalo Fun Run: 5K Distance
Organization: Commerce City Recreation Department
Date of Race: 12-05-2026
Description: DescriptionJoin us for our annual Run with the Buffalo ...
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Run with the Buffalo Fun Run: 2.5 Mile ...
Organization: Commerce City Recreation Department
Date of Race: 12-05-2026
Description: DescriptionJoin us for our annual Run with the Buffalo Ugly ...
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Walk to End Alzheimer's (9/19)
Organization: Commerce City Recreation Department
Date of Race: 09-19-2026
Description: DescriptionLace up and take steps toward a world without Alzheimer's! This ...
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Giants of the Plains Nature Walk
Organization: Commerce City Recreation Department
Date of Race: 11-15-2026
Description: Description
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Race to the Shield Homecoming Run
Organization: Berthoud High Boosters
Date of Race: 09-26-2026
Description: 1st Annual Race to the Shield Homecoming ...
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Other-2 Mile Run - General Admission
Organization: Berthoud High Boosters
Date of Race: 09-26-2026
Description: 1st Annual Race to the Shield Homecoming ...
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Run with the Buffalo Fun Run: 5K Distance
Organization: Commerce City Recreation Department
Date of Race: 12-05-2026
Description: DescriptionJoin us for our annual Run with the Buffalo ...
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Run with the Buffalo Fun Run: 5K Distance
Organization: Commerce City Recreation Department
Date of Race: 12-05-2026
Description: DescriptionJoin us for our annual Run with the Buffalo ...
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Run with the Buffalo Fun Run: 2.5 Mile ...
Organization: Commerce City Recreation Department
Date of Race: 12-05-2026
Description: DescriptionJoin us for our annual Run with the Buffalo Ugly ...
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Run with the Buffalo Fun Run: 2.5 Mile ...
Organization: Commerce City Recreation Department
Date of Race: 12-05-2026
Description: DescriptionJoin us for our annual Run with the Buffalo Ugly ...
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Snobahn Summer Training
Organization: Lake Eldora Racing
Date of Race: 05-31-2027
Description: We have changed the Snobahn options, please read the descriptions below ...
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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?
In 2014, 57% of marathon finishers in the U.S. were men; women made up 43% of finishers.
