The John Lawson Tamalpa Challenge

Berkeley Trail Adventure is an Inside Trail Racing event set in Berkeley, CA, spanning Tilden Regional Park and Wildcat Canyon. Distances offered are 50K (31 miles), 35K (21.6 miles), half marathon (13 miles), and 10K. The course blends technical dirt trails and non-technical fire roads, with about..

The Pacifica Summit Run is a trail running event held at San Pedro Valley State Park in Pacifica, California. It features two race distances: a 10K and a half marathon. Runners experience scenic views from the tallest mountain on the upper San Francisco Peninsula, including stunning postcard vistas..

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 Women's Headlands Half Marathon is a scenic 13.2-mile trail race held annually in the Marin Headlands near Mill Valley, California. Celebrating its third year in 2025, the event features a challenging course with nearly 2,000 feet of elevation gain, showcasing stunning singletrack trails, sweepi..

Reservoir Dogs Trail Run in Orinda, CA offers 10K, Half Marathon, and 35K distances with start and finish in the San Pablo Reservoir Recreation Area. The event is notable as the first trail race to completely circumnavigate Briones Reservoir on EBMUD trails, delivering rolling open fire roads, tree-..

Star City San Bruno Mountain Half Marathon & 5K, organized by the Excelsior Running Club, takes place in Brisbane, CA, on the San Bruno Mountain trails. The course is 93% on trail with about 2,400 feet of elevation gain, including a single-track downhill and sweeping views of the Pacific, Bay, and S..