Trail Running calendar near Redwood City 2025-2026

The Woodside Ramble, hosted by Inside Trail Racing, is a scenic trail running event held at Huddart County Park in Woodside, California. It offers four distances: 10K, Half Marathon, 35K, and 50K, featuring challenging courses through redwood-shaded trails, mixed evergreen forests, and chaparral-cov..

The Brazen New Year's Eve event, held at Lake Chabot in Castro Valley, California, offers runners and walkers the opportunity to participate in a half marathon, 10K, and 5K trail races. This festive race encourages participants to close out the year with a scenic run on beautiful trails, welcoming a..

Brazen New Year's Day is an annual running event held at Lake Chabot in Castro Valley, California. It offers participants the choice of a half marathon, 10K, or 5K race, all set on scenic trails around the lake. The event is known for its invigorating course featuring challenging ascents and descent..

The Hacienda Hills Trail Run - Winter is a trail running event held at Almaden Quicksilver County Park near San Jose, California. It offers nine race distances ranging from a Kids Run and 1 mile to challenging ultra distances like 50K and a trail marathon. The courses feature increasing elevation ga..

The Coyote Hills Run is a scenic running event held at Coyote Hills Regional Park in Fremont, California, featuring a half marathon, 10K, and 5K distances. The courses offer a mix of paved trails, dirt paths, and wooden boardwalks through marshlands, providing varied terrain and beautiful bay views...

The Fort Ord Trail Run, held at the Fort Ord National Monument near Salinas, California, offers 10K, 25K, and 50K race distances. This scenic event takes place on trails within a former U.S. Army post known for its proximity to the beach and diverse natural landscapes, including a nature reserve for..

The Mt. Umunhum Trail Conquest - Winter is a trail running event held at Almaden Quicksilver County Park in San Jose, California. The race offers multiple distances including a 50K, trail marathon, 30K, half marathon, 7-mile, 5K, mile, and a kids run.The longer courses traverse the scenic Sierra Azu..

The Monterey Ultra is a 50-mile trail running event held at Fort Ord National Monument and Laguna Seca Recreation Area in Monterey, California. The course features a diverse mix of terrain including wide fire roads, twisting single-track trails, deep sand, and rocky, rooty climbs, offering runners s..

Bay Breeze in San Leandro is a scenic running event held at the San Leandro Marina Park along the San Francisco Bay. Scheduled for February 14, 2026, it offers a half marathon, 10K, and 5K distances suitable for runners and walkers of all levels. The course features a mostly flat, easy bayside trail..

The Chabot/Redtail Ridge Trail Run takes place at Lake Chabot Regional Park in Castro Valley, California, offering distances of 5K, 10K, half marathon, 30K, and 50K. The course features eucalyptus forests, grassy meadows, lakeside paths, and hilltop vistas, with over 20 miles of trails connecting to..

The Marin Ultra Challenge is a premier long-distance trail race held in Marin County, California, featuring 50K and 50 Mile distances. The course offers about 11,000 feet of elevation gain for the 50 Mile race, traversing scenic and challenging terrain including Rodeo Beach, Marin Headlands, Mt. Tam..

The Napa Valley Trail Marathon, Half Marathon, and 10K is an annual trail running event held at Bothe-Napa Valley State Park in Saint Helena, California. Now in its 34th year, the race features challenging courses with hills, streams, and rocky single-track trails, offering a scenic and rewarding ex..

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..

The Golden Gate Headlands Marathon, Half Marathon, and 10K is an annual trail running event held in the scenic Marin Headlands near Mill Valley, California. Participants start and finish at the Historic Gunnery Range in Rodeo Valley, running on a course that combines single-track hiking trails and f..

The Diablo Trails Challenge is a trail running event held at 1700 Castle Rock Road, Walnut Creek, California. It offers multiple race distances including a 50K ultra, half marathon, 10K, and 5K, catering to both beginners and experienced ultra-runners. The event celebrates and supports the preservat..

The Romancing the Island Half Marathon & 10K is an annual running event held at Angel Island State Park near Belvedere Tiburon, California. Participants enjoy a scenic, hilly loop trail that circumnavigates Angel Island, offering stunning panoramic views of the Golden Gate Bridge, San Francisco, Alc..

The Napa Valley Endurance Run is a challenging trail running event held in Calistoga, California, starting and finishing at the Calistoga Fairgrounds. It offers four race distances: 50k, 35k, half-marathon, and 10k, all traversing scenic single-track and fire road trails through Robert Louis Stevens..

The Badger Cove Half Marathon, held at Del Valle Regional Park in Livermore, California, offers runners a choice of half marathon, 10K, and 5K distances. Scheduled for April 18, 2026, the event features scenic courses through the emerald hills of Lake Del Valle, with the 5K course being virtually hi..

The Mt. Tam Wild Boar Half Marathon & 10K is an annual trail running event held at Mt. Tamalpais State Park in Mill Valley, California.Celebrating its 38th year, the race features a scenic coastal ridge course combining paved roads and single-track dirt trails with stunning views of the Pacific Ocea..

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 about a mile of paved road. Runners enjoy stunning view..