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    100K utmb index ultramarathons in United States

    United States
    100K
    UTMB Index

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    6 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
    Morgan Hill Trail Races

    Morgan Hill Trail Races

    Sep 27, 2026 (Sun)

    New York, New York, United States

    100K
    Fall Back Into the Trail Series

    Fall Back Into the Trail Series

    Oct 31-Nov 2, 2026 (Sat-Mon)

    Lagrangeville, New York, United States

    50K
    100K
    Jackson County Ultras

    Jackson County Ultras

    Dec 5-6, 2026 (Sat-Sun)

    Brownstown, Indiana, United States

    Technical singletrack and rugged trails through Jackson-Washington State Forest, with scenic southern Indiana views and a community hub at Pyoca Camp

    50K
    100K
    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
    MoMoFo 100K & 20 Mile Fun Run

    MoMoFo 100K & 20 Mile Fun Run

    Jun 4, 2027 (Fri)

    Indiana, Indiana, United States

    100K

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    Showing 1 - 6 of 6 events