Trail Running calendar near Clayton 2026-2027

A lakeside out-and-back trail race at Browns Ravine Marina on May 2, 2026, offering 10K, half marathon, 35K and 50K distances with stocked aid stations and a 500 runner capacity.

Run through the historic Beauty Ranch at Jack London State Historic Park. This inaugural trail event features a half marathon and five mile course amongst the vineyards and forested slopes of Sonoma Mountain.

A multi-distance trail event on May 2, 2026 in Almaden Quicksilver County Park offering nine distances, marked courses, aid stations and finishers' medals; bib pick-up and race day registration are available.

A trail running event on May 3, 2026, at Pacific Union College in Angwin, CA offering a 26K, a 10K, and a 1 Mile Kids Run, with a cupless policy and proceeds supporting PUC Athletics.

Experience the 36th annual trail run through Muir Woods and the legendary Dipsea trail. Choose between a marathon, half marathon, or 7 mile route starting from the scenic Stinson Beach.

Experience the scenery of Tilden Regional Park at the Grizzly Peak Trail Run. Choose from various distances including a 50K and marathon starting from the shores of Lake Anza in Berkeley.

Test your endurance at Almaden Quicksilver County Park with 50 km or 100 km trail races. These USATF sanctioned events offer significant elevation gain and the 100 km distance serves as a Western States 100 qualifier.

A 13.1-mile point-to-point half marathon on May 9, 2026 through Napa Valley vineyard roads, finishing in Yountville with a Wine Village featuring local wine, food, music, and winery-hosted aid stations.

Celebrate the 24th year of this community event in Los Altos Hills. Run or walk through the Westwind Community Barn and Byrne Preserve on hilly 5K, 10K, or 1 mile courses.

Experience the lush redwood landscapes of Saratoga at Trailquake 2026. Choose between 5K, 10K, or half marathon distances on forested trails with options to run, walk, or join remotely.

Celebrate Mother's Day on May 10th with a family-friendly run or walk. The event, held at Pinto Lake County Park, features a 1K kids run, 5K, and 10K. Your participation benefits Pajaro Valley Shelter Services.

Multiple trail distances through Skyline Wilderness Park in Napa, featuring Rim Rock climbs and valley views, touchless aid stations, and a cupless policy that requires runners to carry their own hydration.

A charity trail event at Skyline Ridge Open Space Preserve offering 50K, 30K and 10K distances. All registration proceeds go to the UCSF Julia Carnevale Lab for cancer research.

The inaugural Rim Rock 50 Mile Trail Challenge explores Napa's wild trails. Runners will tackle a two-loop course through Skyline Park and the new Suscol Headwaters. This cupless event offers a 50-mile solo or relay option with a 13-hour cu..

Experience 360 degree views of the Bay Area at Wildcat 2026 in El Sobrante. This scenic event features a Half Marathon, 10K, and 5K as well as a remote participation option.

Wild Rose Half Marathon & 5K The Wild Rose Half Marathon & 5K takes place in Roseville, California. The event starts and finishes at the Moksa Barrel House on Foothills Boulevard. The event offers three distances: Half Marathon: Th..

A 13 mile point to point trail race through Almaden Quicksilver Park and Sierra Azul Open Space Preserve near San Jose. Transportation to the start is provided and race day registration with bib pick up is available.

Mud Factor Sacramento is a 5K mud and obstacle run at the 300 acre Mahon Ranch in Elk Grove on May 17, 2026. The event includes adult and KIDZ family waves, a festival area with paid spectator access, and required signed waivers.

Trail races at China Camp State Park near San Rafael include Half Marathon, 10K, and 5K on single track and open trails with views of Mt. Tam and San Pablo Bay. Aid stations offer gels, snacks, and hydration; capacity is 275.

Experience trail running at Point Pinole Regional Shoreline Park in San Pablo. Choose between half marathon, 10K, or 5K distances on a historic site once home to TNT factories.