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    12hr relay ultramarathons in California, United States

    Relay
    United States
    12hr
    California

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    2 races

    Dirty Dozen Endurance Run

    Dirty Dozen Endurance Run

    Jul 25, 2026 (Sat)

    Pinole, California, United States

    Scenic loop route on dirt fire trails with modest elevation gain and classic trail ambiance

    6h
    12h
    Napa Lapa

    Napa Lapa

    Aug 8, 2026 (Sat)

    Napa, California, United States

    Time-based ultrarun in Napa's Skyline Wilderness Park, 4.16-mile trail loop with 815 feet of gain per lap through rolling hills and historic landscapes

    6h
    12h

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