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Best Boulder, Colorado Half Marathon Races

View some of the best Half Marathon races in Boulder, Colorado! RaceMob's race calendar allows you to find races that suits your needs. Use our advanced filters below or calendar on the right, and discover new races. We try to maintain up to date information, and rely heavily on our community of volunteers. If you find a race that we're missing, use the "Suggest Race" button on the right. Find RaceMob discounts that others have added or add deals that you've discovered.

    • 1/2M

    Georgetown, CO

    31.19 miles away

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    Slacker Half Marathon-Relay-4-Mile Races

    Come join us for the highest DOWNHILL half marathon in the country and possibly the highest DOWNHILL 4 Mile Run! Do not be misled by the name but this is the Slacker Half Marathon/4M Race! It is the highest downhill half marathon in the country–b...

    • 1/2M

    Castle Rock, CO

    46.17 miles away

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    Summer Splash Prairie Dog Half, 10k, & 5k

    Welcome to the Summer Splash Prairie Dog Half, 10k & 5k in Castle Rock, Colorado. Visit www.PrairieDogHalf.com for more information on this event: http://prairiedoghalf.com/summer.html  

    • 1/2M

    Estes Park, CO

    27.51 miles away

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    Rocky Mountain Half Marathon & 5K

    Join us for a weekend of running and scenic mountain views in historic Estes Park, Colorado just outside Rocky Mountain National Park.  Race Dates:5K - July 29, 2022Half Marathon - July 30, 2022 Run one race or register for the Elk Double and ru...

    • 1/2M

    Fort Collins, CO

    40.85 miles away

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    The Choice City Running Event

    Friday, August 5th, 2022 Jane Welzel Mountain Ave Mile Faster than Flat - point-to-point, slightly downhill mile on Mountain Avenue in Fort Collins, CO. Featuring multiple start waves: 6:30 pm - Kids Wave (untimed)6:40 pm - Pushrim/Wheelchair W...

    • 1/2M

    Conifer, CO

    36.5 miles away

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    Staunton Rocks! Marathon & Half

    Welcome to the Staunton Rocks! Marathon & Half, an event put on by trail runners for trail runners. Touring the renowned singletrack of Staunton State Park in Colorado’s Front Range Mountains southwest of Denver, the race will take you back in...

    • 1/2M

    Longmont, CO

    12.8 miles away

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    American Heroes Run

    The tragic events of 9/11/01 changed our nation forever. Let us not forget our proud history and those who fight everyday to keep us free. Please join us for this special day on this beautiful, flat, fast 1.05-mile loop course. The 100-mile race c...

    • 1/2M

    Winter Park, CO

    30.88 miles away

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    Winter Park Half Marathon & 5K

    Push your limits with these stunning, remote races in the heart of the Rocky Mountains - located just 60 miles outside of Denver! Our Half Marathon and 5K are perfect for athletes of all levels, but will be sure to challenge you as you enjoy the b...

    • 1/2M

    Bellvue, CO

    40.03 miles away

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    Black Squirrel Half Marathon

    The Black Squirrel Trail Half Marathon takes place on the wonderful trails of Lory State Park to the northwest of Fort Collins, CO. The trail half marathon course offers a tour of the outer boundaries of Lory State Park, providing breathtaking vie...

    • 1/2M

    Greeley, CO

    37.69 miles away

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    10th Annual Superhero Event

    This is our 10th year of our Superhero Event!  We are so excited to celebrate this milestone!  We will be back at Greeley's Family FunPlex and runners can participate in person in our 10K, 5K, 1 Mile and a free kids run or they can participate in ...

    • 1/2M

    Loveland, CO

    27.71 miles away

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    Long View Marathon & Half

    Showcasing a unique city-to-city trail connection, The Long View Marathon and Half Marathon runs from Fort Collins to Loveland. Together, Gnar Runners and Sweetheart City Racing bring a unique collaboration to Colorado’s running scene in this one-...

    • 1/2M

    Windsor, CO

    36.25 miles away

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    Windsor Marathon, Half Marathon, 10K & 5K

    Welcome to the second annual Windsor CO Race! This year's event will start and end at The Island at Pelican Lakes in Water Valley, with a great after party including beer, food, music and a live band! New to the series is a Full Marathon distance,...

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