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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

    Windsor, CO

    36.25 miles away

    I'm Attending

    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,...

    • 1/2M

    Fort Collins, CO

    41.31 miles away

    I'm Attending

    Horsetooth Half Marathon

    Welcome to the 47th running of the Horsetooth Half Marathon. Your race will take you on a scenic point-to-point journey from Hughes Stadium, the former home of the CSU Rams, to the finish line party at New Belgium Brewery. On the way you’ll tackle...

    • 1/2M

    Littleton, CO

    31.16 miles away

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    Santa Stampede 5K/10K/Half

    Join us for a Christmas Classic! The Santa Stampede 5K/10K is a flat and fast 5K, 10K and half marathon held along the banks of the scenic South Platte River in Littleton, Colorado. The holidays can be stressful, so why not keep the stress away wi...

    • 1/2M

    Arvada, CO

    14.65 miles away

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    Spring Fling Prairie Dog Half, 10k, & 5k

    The Arvada event supports Community Table, an Arvada Food bank.  Bring 5 items for donation on race day and you'll be entered into a raffle for great prizes from 3W Races and our sponsors! Welcome to the SPRING FLING Prairie Dog Half (part of the...

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