Trail Running calendar near Woodside 2025-2026

Bay Breeze is a Bay Area running event held at San Leandro Marina Park in San Leandro, California. The race offers Half Marathon, 10K, and 5K distances, all starting and finishing on the bayfront. The mostly-flat bayside course stays close to the water, offering romantic views of the San Francisco B..

Redtail Ridge at Lake Chabot Regional Park in Castro Valley, CA offers multiple distances: 5K, 10K, Half Marathon, 30K, and 50K. The course unfolds on a mix of moderately technical dirt trails and non-technical fire roads, with some paved sections, and features rolling hills that reward pacing and t..

Montara Mountain Trail Run takes place at San Pedro Valley Park in Pacifica, California. The event offers multiple distances: 10K, Half Marathon, 20 miles, Marathon, 50K, and a free Kids Run. Runners traverse the undisturbed Coastal Mountain Habitat with views of the Pacific, climbing through groves..

Zoom Angel Island is a trail running event on Angel Island, accessible via chartered ferries from Tiburon, California, offering spectacular views of Marin County and San Francisco. Distances include 5 miles, 10 miles, 15 miles, plus a Kids Run (free). The hilly course circles the island and climbs M..

Marin Ultra Challenge is Inside Trail Racing’s premier Marin County trail race in Sausalito, California. It offers two long-distance options: a 50-mile and a 50K. The course starts at Rodeo Beach and winds through the Marin Headlands, Mt.Tamalpais, and Muir Woods, combining coastal vistas, redwood c..

Redwood (Spring) Trail Run is held at the Chabot Space & Science Center in Oakland, California, featuring multiple distances from 5 miles up to 50K, plus a Half Marathon, Marathon, 30K, a 5K, and several youth events. The course winds through Redwood Regional Park, offering spectacular views along t..

The Western Pacific Marathon event, held at Quarry Lakes Regional Recreation Area in Fremont, California, offers runners a choice of half marathon, 10K, and 5K distances. The course is mostly flat, following the historic Western Pacific Trail, which was originally used in the 1800s to transport grav..

Set in the Marin Headlands, the Golden Gate Headlands Marathon, Half Marathon & 10K starts and finishes at the Historic Gunnery Range in Rodeo Valley, Mill Valley, California. The course traverses scenic single-track trails and fire roads, offering panoramic views of San Francisco Bay, the Golden Ga..

Diablo Trails Challenge is a trail-running event held at 1700 Castle Rock Road, Walnut Creek, CA, in support of Save Mount Diablo. The race offers multiple distances to suit all levels: 50K, half marathon, 10K, and 5K, plus a Remote Runner option. The course traverses Mount Diablo’s open-space trail..

Romancing the Island Half Marathon & 10K takes place at Angel Island State Park, Belvedere Tiburon, California. The course is a hilly loop around the island: the half marathon runs the loop twice, the 10K once. Runners enjoy panoramic views of the Golden Gate Bridge, San Francisco, Alcatraz, the Eas..

Badger Cove Half Marathon/10K/5K 2026 is held at Del Valle Regional Park in Delvalle, Livermore, California. The emerald hills of Lake Del Valle form the backdrop for three races: a half marathon, 10K, and a 5K, with a virtually hill-free 5K option when conditions permit. The event, hosted by Brazen..

Mt Tam Wild Boar Half Marathon & 10K takes place in Mt Tamalpais State Park, Mill Valley, California. The coastal ridge course blends rolling single-track with paved sections, offering views of the Pacific Ocean, Bolinas Lagoon, and Marin County watershed. Runners traverse Ridgecrest Blvd along Boli..

The Miwok 100K is a renowned trail ultramarathon held near Stinson Beach, California, just under an hour from San Francisco. The challenging 100-kilometer course features 11,800 feet of elevation gain across single-track trails, dirt roads, and a short paved section. Runners enjoy stunning views of..

Enviro-Sports presents the Stinson Beach/Muir Woods Marathon, Half Marathon & 7 Mile, a trail race held in Stinson Beach, California. The 36th edition offers Marathon, Half Marathon and 7 Mile distances, with entries capped at 300 participants. From Stinson Beach Park, racers head into the Dipsea tr..

Trailquake 2026 is Brazen Racing’s trail event at Sanborn Park, 16055 Sanborn Rd., Saratoga, CA. It offers 5K, 10K, and half-marathon distances. Runners traverse redwoods and pines on spectacular single-track trails, with ascents to peaks that reward you with panoramic views.The course suits all lev..

Run for Amma is an annual charity running event held at Skyline Ridge Open Space Preserve in Los Gatos, California, celebrating its 15th anniversary in 2026. The event offers three race distances: a challenging 50K with 5,266 feet of elevation gain, a 30K with 3,629 feet of elevation gain, and a 10K..

Rim Rock 50 Mile Trail Challenge is the inaugural ultramarathon in Napa Valley, staged at Skyline Wilderness Park and weaving through the Napa Open Space Preserve and the new Suscol Headwaters Trail System. The event offers a 50-mile solo option or a two-person relay, with two roughly 26-mile loops..

Napa Wilderness Trail Runs, held at Skyline Wilderness Park (2201 Imola Ave, Napa, CA), offers a spectrum of trail races from a 10K up to a 50K. The event emphasizes accessibility for all levels, with a 50K and 30K designed with guidance from ultra runner Angela Abbey. The courses feature Rim Rock T..

Wildcat 2026, held at 3800 Clark Road in El Sobrante, California, offers a Half Marathon, 10K, and 5K. The page highlights spectacular 360-degree views of the Bay Area from the course. Specific route details aren’t described, but the event is run by Brazen Racing and takes place within East Bay Regi..

Nitro Trail 2026 is a trail-running event held at Point Pinole Regional Shoreline Park, 5551 Giant Highway, San Pablo, California 94806. It offers three distances: a half marathon, 10K, and 5K, appealing to a range of runners and walkers. The event is branded with an energetic theme, described as an..