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    100K Fall ultramarathons in Iowa, United States

    Fall
    United States
    100K
    Iowa

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    2 races

    Booneville Backroads Ultra

    Booneville Backroads Ultra

    Sep 5, 2026 (Sat)

    Booneville, Iowa, United States

    Rural Iowa backroads and the scenic Bridges of Madison County, thousands of feet of elevation gain, challenging hills, and muddy roads in wet conditions

    50K
    100K
    100mi
    Mines of Spain 100

    Mines of Spain 100

    Oct 16, 2026 (Fri)

    Dubuque, Iowa, United States

    Steep climbs, technical paths, and flat prairie trails on a looped course through forests and bluffs, featuring river views in Iowa's driftless region.

    100K
    100mi

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