Trail Running calendar near Orinda 2025-2026

The Pacifica Summit Run is an exciting running event taking place at San Pedro Valley State Park in Pacifica, CA. Participants can choose between a 10K and a Half Marathon, both offering stunning views of the Pacific Ocean coastline and challenging switchbacks. This event is designed for runners of..

The Mt. Umunhum Marathon, known as the Race to the Top and Down, offers an exhilarating trail running experience in the scenic South Bay Area hills. Participants will start at the Hacienda Entrance of Almaden Quicksilver Park, ascend to the summit of Mt.Umunhum, and then race back down. This event s..

The Star City San Bruno Mountain Half Marathon, organized by the Excelsior Running Club, will take place on October 4, 2025. This scenic race features a challenging 13.1-mile course that is 93% on trails, with an elevation gain of 2,400 feet, offering stunning views of the Pacific Ocean, Bay, and Sa..

The Reservoir Dogs Trail Run, taking place in Orinda, CA, offers a unique opportunity to run on the scenic trails surrounding the Briones Reservoir. Participants can choose from three distances: 10K, Half Marathon, and 35K, all featuring beautiful, rolling terrain and stunning views of the East Bay...

The Women's Headlands Half Marathon, taking place on October 4, 2025, in the scenic Marin Headlands, offers a challenging and beautiful course for runners. Participants can choose between a half marathon (12.6 miles) and a 10K (6 miles), both starting and finishing at Rodeo Beach. The event showcase..

The Ruth Anderson Memorial Endurance Run is a prestigious running event held annually in San Francisco, California, since 1986. This endurance race features multiple distances, including 50 miles, 100 kilometers, and 50 kilometers, attracting runners of various skill levels. The course consists of a..

The Mt. Umunhum Trail Conquest-Fall is an exciting running event taking place at Almaden Quicksilver Park in San Jose, CA. Participants can choose from various distances, including a 50K, Trail Marathon, 30K, Half Marathon, 7 Miler, and 5K.The courses feature scenic routes through the Sierra Azul Op..

The Willow Hills XC is an annual cross-country race organized by the Buffalo Chips Running Club, taking place at the Willow Hill Reservoir near Folsom High School. Celebrating its 15th year, this event features a challenging 5k course consisting of two loops through rolling hills. Participants can c..

The California Fall Classic 100K and 55K at Lake Sonoma is set for October 18, 2025, offering runners a challenging and scenic experience in California's wine country. The event features two courses that showcase stunning views of Lake Sonoma, with the 100K serving as a qualifier for the Western Sta..

The Haunted Hills 10K in Redwood City is a unique running event scheduled for October 25, 2025. Participants can form teams of 1 to 5 and embark on a fun-filled adventure through the festively decorated neighborhoods. Runners will navigate approximately 36 checkpoints on the 10K course, answering si..

The ZombieRunner Halloween event is a festive running competition taking place in San Jose, CA, featuring a variety of race distances including a 5K, 10K, Half Marathon, and Marathon, along with special categories for younger participants. Runners are encouraged to don Halloween costumes for a chanc..

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk is an exciting event taking place at Joaquin Miller Park, aimed at supporting the Oakland Tech Cross Country and Track Team. Participants can choose between a challenging 5K trail run or a more leisurely 1-mile fun run/walk, both set again..

The Lake Chabot Trail Run is a multi-distance running event taking place at Lake Chabot Regional Park in Castro Valley, California. Scheduled for November 8, 2025, the event features various race options including an 8K, Half Marathon, 30K, Marathon, and 50K, along with a free Kid's Run for children..

The Rancho Hills Trail Run - Fall is an exciting running event set in the scenic Rancho Cañada del Oro Open Space Preserve in Morgan Hill, CA. Participants can choose from various distances, including 50K, Marathon, 30K, Half Marathon, 10 Miler, 8 Mile, 10K, and 5K. The course features a mix of sing..

The Zoom Turkey Trot is a festive running event taking place in San Jose, California, featuring multiple race options including a 5K, 10K, and Half Marathon, along with youth categories and a free Kid's Run. Participants can enjoy the scenic Coyote Creek trail on Thanksgiving morning, with the chanc..

The Quad Dipsea will take place in Mill Valley on Saturday 29 November 2025.

The Quarry Turkey Half Marathon is a family-friendly running event taking place on Thanksgiving weekend at Quarry Lakes Regional Park. Scheduled for November 29, 2025, the event features a half marathon, 10K, and 5K, along with a free "Little Turkeys" race for children. Participants are encouraged t..

The ZombieRunner Quarry Lakes event is a running competition held at the scenic Quarry Lakes Regional Recreation Area in Fremont, California. Participants can choose from various distances, including a 5K, 10K, Half Marathon, 30K, and Marathon, along with youth categories and a free Kid's Run. The c..

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 50K, Trail Marathon, 25K, Half Marathon, 15K, 10K, 5K, and a Kids Run. The course features scenic single tracks, hills, and dirt path..

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..