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    100K utmb world series ultramarathons in United States

    United States
    100K
    UTMB World Series

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    2 races

    Grindstone Trail Running Festival by UTMB

    Grindstone Trail Running Festival by UTMB

    Sep 18-19, 2026 (Fri-Sat)

    Augusta County, Virginia, United States

    Challenging mountain courses through national forests west of the Shenandoah Valley, featuring fall foliage and panoramic vistas on demanding terrain.

    50K
    100K
    100mi
    Canyons Endurance Runs

    Canyons Endurance Runs

    Apr 23-24, 2027 (Fri-Sat)

    Auburn, California, United States

    Rugged Sierra Nevada foothills, historic gold-rush routes, steep canyons, and challenging scenic terrain through the birthplace of mountain ultras

    50K
    100K
    100mi

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