Trail Running calendar near Castro Valley 2025-2026

The Muir Woods Marathon, Half Marathon, and 7 Mile race take place annually at Stinson Beach, California, offering a challenging trail running experience through the scenic Muir Woods. Participants start at sea level before ascending into dense redwood and oak forests along the historic Dipsea Trail..

Run for Amma is an annual charity running event held at Skyline Ridge Open Space Preserve in Los Gatos, California, supporting UCSF cancer research. Celebrating its 15th anniversary, the event offers three race distances: a challenging 50K with 5,266 feet of elevation gain, a 30K with 3,629 feet of..

The Rim Rock 50 Mile Trail Challenge is an inaugural ultramarathon held in Napa Valley, California, centered at Skyline Wilderness Park. The race features a challenging 50-mile solo course or a 50-mile relay for teams of two, traversing rugged trails through Skyline Wilderness Park, Napa Open Space..

The Napa Wilderness Trail Runs, held at Skyline Wilderness Park in Napa, California, offer a variety of trail running distances including 10K, 21K (half marathon), 30K, and a challenging 50K ultra marathon. The courses feature scenic routes with steep climbs, notably the Rim Rock Trail, providing st..

Sonoma Coast Trail Runs, hosted by SkyBreaker Racing, take place in Sonoma Coast State Park near Duncans Mills, California. The event offers multiple distances: 50K, Trail Marathon, 30K, and Half Marathon, all featuring challenging elevation gains ranging from 2,800 to 7,000 feet. Runners traverse s..

The Toro Park Trail Run, held in Salinas, California, offers runners a scenic experience through the iconic Bay Area landscape. Participants can choose from three distances: a 10K, a half marathon (21K), and a full trail marathon. The course features rolling golden hills, sparse coast live oak trees..