Trail Running calendar near Walnut Creek 2025-2026

The Calero Trail Run - Winter is an exciting trail running event held at Calero County Park in San Jose, CA. Participants can choose from various distances, including a 50K, Trail Marathon, 25K, Half Marathon, 15K, 10K, 5K, and a Kids Run. The course features scenic single tracks, hills, and dirt pa..

The Hunter S. Thompson Fear & Loathing event is a renowned ultra-running race held annually in San Francisco, CA, celebrating its 41st edition in December 2025. Participants can choose between a 50K and a 50-mile course, with no entry fee required.The race features a mix of city streets and parallel..

The Folsom Lake Point to Point Trail Half Marathon is a scenic running event taking place in El Dorado Hills, CA, featuring a predominantly single-track trail that runs alongside the picturesque Folsom Lake. The course offers a mix of technical sections and gentle rolling hills, providing runners wi..

The Summit Rock Half Marathon, along with 10K and 5K events, takes place in the scenic Sanborn County Park, nestled in the Santa Cruz Mountains near Saratoga, California. Participants can enjoy running through beautiful redwood groves and along single-track trails, with options for both experienced..

The Brazen New Year's Eve event offers participants the chance to run a half marathon, 10K, or 5K at Lake Chabot in Castro Valley, California. This event is designed for runners of all levels, including hikers and walkers, making it an inclusive experience. It serves as a perfect opportunity to fini..

The Brazen New Year's Day event in 2026 offers participants a chance to kick off the new year with invigorating races at Lake Chabot in Castro Valley, California. Runners can choose from a half marathon, 10K, or 5K, making it suitable for various fitness levels. The event encourages participants to..

The Hacienda Hills Trail Run - Winter is an exciting trail running event set in the scenic Almaden Quicksilver County Park near San Jose, California. Scheduled for January 3, 2026, this event features nine different race distances, including a Kids Run, 5K, 10K, half marathon, marathon, and a challe..

The Folsom Lake Sweetwater Trail Run is an exciting running event taking place at the Folsom Lake State Recreation Area. Scheduled for January 24, 2026, participants can choose from various distances, including a Kids Run, 1 Mile, 5K, 10K, 9 Mile, Half Marathon, 30K, Trail Marathon, and 50K. The cou..

Coyote Hills Run is an exciting running event taking place on January 24, 2026, at Coyote Hills Regional Park in Fremont, California. Participants can choose from various distances, including a 5K, 10K, and half marathon, with registration fees varying based on the chosen event and registration peri..

The Mt. Umunhum Trail Conquest - Winter is an exciting running event taking place at Almaden Quicksilver County Park in San Jose, CA. Participants can choose from various distances, including a 50K, Marathon, 30K, Half Marathon, 7 Miler, 5K, and a Kids Run.The course features scenic trails that lead..

Bay Breeze 2026 is a scenic running event taking place at the San Leandro Marina Park, featuring a half marathon, 10K, and 5K races. Known for its picturesque views of San Francisco and the Bay, the course offers a mostly flat, easy trail ideal for both seasoned runners and beginners. Participants c..

The Bad Ass Backyard Ultra, held at Dry Creek Parkway in Rio Linda, CA, is a unique running event where participants complete 4.16-mile loops within one hour. Runners must be ready at the start corral for each new loop, which begins on the hour. The event, originally a casual gathering in 2023, beca..