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    December ultramarathons in Massachusetts, United States

    December
    United States
    Massachusetts

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    2 races

    TARC Winter Classic

    TARC Winter Classic

    Dec 5, 2026 (Sat)

    Stoneham, Massachusetts, United States

    Rugged technical trails with roots, rocks, steep elevation changes, and intermittent Boston skyline views in classic New England woodland

    32mi
    40mi
    Seth's Fat Ass

    Seth's Fat Ass

    Dec 19, 2026 (Sat)

    Springfield, Massachusetts, United States

    Ten 5K paved loops in Forest Park with limited traffic, possible snow, and flexible distance options on the Snowstorm Classic 5K route

    50K

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