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    Thornton Races

    Find running races in Thornton, Colorado.

    Races in Thornton, Colorado

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    RMRR Spring Marathon Training Series #1

    Sun, Mar 29, 2026
    Thornton, Colorado
    road
    Rolling
    60PR40value40vibe
    Register
    Other

    RMRR Spring Marathon Training Series #2

    Sat, Apr 11, 2026
    Thornton, Colorado
    road
    Rolling
    60PR40value40vibe
    Register
    5K

    Unicorn 5k (North)

    Sat, Jun 20, 2026
    Thornton, Colorado
    road
    Rolling
    65PR40value45vibe
    Register
    10K

    RMRR September Trophy Series

    Sun, Sep 13, 2026
    Thornton, Colorado
    road
    Rolling
    65PR40value55vibe
    scenic
    Register
    5K

    I Can 5k

    Sat, Oct 3, 2026
    Thornton, Colorado
    road
    Rolling
    65PR40value45vibe
    Register
    5K

    I Ain't Scared (of 5k)

    Sat, Oct 31, 2026
    Thornton, Colorado
    road
    Rolling
    65PR40value85vibe
    costume
    music
    festive
    Register
    5K

    WinterFest 5k & Fun Run

    Sat, Dec 12, 2026
    Thornton, Colorado
    road
    Rolling
    65PR40value65vibe
    beer
    festive
    Register