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    Half Marathon · Colorado

    Half Marathons in Colorado

    Every half marathon we track across Colorado, sorted by date. Each card shows deterministic 0–100 scores for beginner-friendliness, PR potential, value, vibe, and family appeal.

    Open in race search for full filters →
    Half Marathon

    Vallecito Lake Heavy Half

    Sat, May 16, 2026
    Bayfield, Colorado
    road
    Rolling
    60PR40value55vibe
    scenic
    Register
    Half Marathon

    All-Out Summer Breeze

    Sat, Jun 13, 2026
    Arvada, Colorado
    road
    Rolling
    60PR40value55vibe
    scenic
    Register
    Half Marathon

    Slacker Half Marathon-Relay-4-Mile Races

    Sat, Jun 20, 2026
    Georgetown, Colorado
    road
    Rolling
    60PR40value55vibe
    festive
    Register
    Half Marathon

    All-Out Dog Days

    Sat, Jul 11, 2026
    Westminster, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

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

    Sat, Jul 18, 2026
    Castle Rock, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

    Sheep Mountain Trail Runs

    Sat, Aug 1, 2026
    Fairplay, Colorado
    trail
    Rolling
    30PR40value55vibe
    scenic
    Register
    Half Marathon

    All-Out Runapalooza

    Sat, Aug 8, 2026
    Arvada, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

    Erie Half & 5k

    Sun, Aug 16, 2026
    Erie, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

    Byers Peak Stampede Half Marathon & 5K Run

    Sat, Aug 22, 2026
    Fraser, Colorado
    road
    Rolling
    60PR40value55vibe
    scenic
    Register
    Half Marathon

    Pioneer Prairie Dog Half, 10k & 5k

    Sun, Aug 23, 2026
    Westminster, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

    Labor Day Half Marathon

    Mon, Sep 7, 2026
    Parker, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

    Trail Sisters Women's Half Marathon & 10k

    Sat, Sep 12, 2026
    Buena Vista, Colorado
    trail
    Rolling
    30PR40value55vibe
    scenic
    Register
    Half Marathon

    Black Squirrel Half Marathon

    Sat, Sep 12, 2026
    Bellvue, Colorado
    road
    Rolling
    60PR40value55vibe
    scenic
    Register
    Half Marathon

    All-Out Fall Fest

    Sat, Sep 19, 2026
    Westminster, Colorado
    road
    Rolling
    60PR40value55vibe
    scenic
    Register
    Half Marathon

    Autumn Run

    Sat, Sep 19, 2026
    Buena Vista, Colorado
    road
    Rolling
    60PR40value40vibe
    Register
    Half Marathon

    Fall Equinox

    Sun, Sep 20, 2026
    Fort Collins, Colorado
    road
    Rolling
    60PR40value75vibe
    beer
    music
    scenic
    Register
    Half Marathon

    Westy Half & 5k

    Sun, Oct 11, 2026
    Westminster, Colorado
    road
    Rolling
    60PR40value45vibe
    Register
    Half Marathon

    All-Out Kooky-Spooky

    Sun, Nov 1, 2026
    Golden, Colorado
    road
    Rolling
    60PR50value95vibe
    scenic
    festive
    charity
    Register
    Half Marathon

    HRCA Backcountry Wilderness Half Marathon

    Sat, Nov 7, 2026
    Lone Tree, Colorado
    trail
    Rolling
    30PR40value45vibe
    Register
    Half Marathon

    All-Out Fa La La

    Sat, Dec 5, 2026
    Westminster, Colorado
    road
    Rolling
    60PR40value55vibe
    festive
    Register
    Half Marathon

    All-Out Polar Prowl

    Sat, Jan 9, 2027
    Arvada, Colorado
    road
    Rolling
    60PR40value55vibe
    scenic
    Register
    Half Marathon

    50 States Half Marathon Club General Membership

    Fri, Feb 10, 2034
    Colorado Springs, Colorado
    road
    Rolling
    60PR40value40vibe
    Register
    Half Marathon

    Fifty States Half Marathon Club Life Membership

    Sat, Feb 11, 2034
    Colorado Springs, Colorado
    road
    Rolling
    60PR40value40vibe
    Register

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    Top metros in Colorado for half marathons

    Cities in Colorado with the most half marathon races on the calendar.

    Westminster5Arvada3Buena Vista2Colorado Springs2Bayfield1Georgetown1Castle Rock1Fairplay1Erie1Fraser1Parker1Bellvue1