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Best St. Louis, Missouri Half Marathon Races

View some of the best Half Marathon races in St. Louis, Missouri! 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

    Saint Charles, MO

    18.35 miles away

    I'm Attending

    MO' Cowbell Marathon/Half-Marathon/Half-Marathon Relay/5K

    Don't miss the fun and excitement of the MO' Cowbell Race on October 2-3, 2021!  Two event to choose from on Saturday evening, the 5K and the Mini Moo One Mile Fun Run and three events to choose from on Sunday morning, the Marathon, the Half-Marat...

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