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    December ultramarathons in Colorado, United States

    December
    United States
    Colorado

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    3 races

    Sawmill Trail Runs

    Sawmill Trail Runs

    Dec 5, 2026 (Sat)

    Pine, Colorado, United States

    High-altitude 50k on technical trails through Staunton State Park, featuring rugged mountain terrain, granite cliffs, meadows, and frequent wintry conditions.

    50K
    Thumbs Up Vertical Challenge

    Thumbs Up Vertical Challenge

    Dec 5, 2026 (Sat)

    Estes Park, Colorado, United States

    1km out-and-back trail with a 540-foot ascent, poker chip turnarounds, and milestone awards for multiple ascents

    8h
    Stocking Suffer 8-Hour Endurance Run

    Stocking Suffer 8-Hour Endurance Run

    Dec 6, 2026 (Sun)

    Abbeyville, Colorado, United States

    8h

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    Showing 1 - 3 of 3 events