Napa Wilderness Trail Runs

JP's Backyard Ultra/Hike is a grassroots ultramarathon and hike held at Skyline Wilderness Park in Napa, California. In its third year, the event features a 3.3-mile loop with 550+ feet of climbing through rocky and shaded trails. Runners and hikers may do 1 to 10 loops, starting together on the hou..

The Reservoir Dogs Trail Run is a trail-running event on EBMUD lands around San Pablo and Briones Reservoirs near Orinda and El Sobrante, CA. The event takes place on Saturday, October 4, 2025, and offers three distances: 35K : 23.4 miles, ~2,800 ft elevation gain Half Marathon : 13.9 miles, ~1,45..

Go Wild Marin offers a trail and wilderness navigation challenge in Corte Madera, California, with 2-hour and 4-hour options. Teams of 1 to 5 use a custom map to locate up to 24 checkpoints scattered along trails and wild areas of the Tiburon Peninsula. The event emphasizes exploration and navigatio..

The event is a time-based trail run held at Skyline Wilderness Park in Napa, California. Runners compete to cover as much distance as possible within a chosen time limit. The event capacity is 400 participants across all options. 12 Hour 6 Hour 3 Hour The course is a loop of 4.16 miles with appr..

The event is three cross-country races held at Miwok Meadows in China Camp State Park, San Rafael, CA. The races are run as a memorial to a Tamalpa Runner who died in 2000. Each race uses the same course as in 2024 and is roughly 4.20 miles long. The course is mostly rolling single-track trail with..

The Diablo Summit Stomp takes place on October 18, 2025, at Castle Rock Park / Mount Diablo State Park, starting from 1700 Castle Rock Road in Walnut Creek, CA. The event offers trail distances on dirt trails with some hills; depending on weather, courses may include mud and creek crossings. Walker..