Trail Running calendar near Orinda 2025-2026

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

The Women's Headlands Half Marathon, taking place on October 4, 2025, is a scenic running event set in the stunning Marin Headlands, starting and finishing at Rodeo Beach. This annual race features a challenging half marathon distance of 12.6 miles with an elevation gain of 2,494 feet, as well as a..

The Reservoir Dogs Trail Run, taking place at the San Pablo Reservoir in Orinda, CA, features three race distances: 10K, Half Marathon, and 35K. This unique event allows participants to fully circumnavigate the scenic Briones Reservoir on trails typically reserved for permit-only access. Runners wil..

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 County Park in San Jose, CA. Participants can choose from various distances, including a 50K, Trail Marathon, 30K, Half Marathon, 7 Miler, and 5K.The race features scenic trails that lead into the Si..

The California Fall Classic at Lake Sonoma is a premier ultramarathon event featuring 100K and 55K races set in California's scenic wine country. Held in October, the courses traverse challenging single-track trails with stunning views of Lake Sonoma during harvest season. The event serves as a qual..

The Lake Sonoma 100K and 55K are challenging ultramarathon races held in California's wine country, offering scenic courses through rugged terrain and picturesque views of Lake Sonoma. Scheduled for October 18, 2025, the events feature two distances that navigate miles of single-track trails, making..

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

The California Fall Classic at Lake Sonoma features two challenging ultra-distance races: a 100K and a 55K, set against the stunning backdrop of wine country. Scheduled for October 18, 2025, this event is ideal for runners seeking a late-season challenge or a chance to qualify for the Western States..

The Diablo Summit Stomp is an exciting trail running event scheduled for October 18, 2025, in Walnut Creek, California. Participants can choose from four distances: 30K, Half Marathon, 10K, and 5K, all set on scenic dirt trails that lead into Mount Diablo State Park. The event is designed to accommo..

The Napa Fall Wine Country Marathon is a scenic running event taking place in Bothe-Napa Valley State Park, California, on October 25, 2025. This 33rd annual marathon features a challenging course with lush trails, hills, and streams, making it a rewarding experience for participants. The event incl..

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. The course features approximately 36 checkpoints for the 10K, where runners will a..

The Oakland Hills Trail Run is an exciting outdoor running event taking place in the scenic Redwood Regional Park and EBMUD Trails in Oakland, California. Participants can choose from three distances: 10K, Half Marathon, and 35K, all set against a backdrop of stunning redwood forests and diverse wil..

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 youth categories and a free Kid's Run. Participants are encouraged to dress in Halloween costumes for a c..

The Almaden Hills Trail Run - Fall is an exciting running event taking place in the scenic Almaden Quicksilver park in San Jose, CA. Participants can choose from various distances, including a 50K, Trail Marathon, 30K, Half Marathon, 8 Mile, 10K, and 5K. The course features a mix of 60% dirt roads a..

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk is set to take place at Joaquin Miller Park, supporting the Oakland Tech Cross Country and Track Team. This event features a scenic 5K trail run and a 1-mile fun run/walk, designed to cater to both competitive runners and leisurely partici..

The Lake Chabot Trail Run is a diverse running event taking place at Lake Chabot Regional Park in Castro Valley, California. Scheduled for November 8, 2025, it features multiple race distances including a 50K, Marathon, 30K, Half Marathon, 8K, and a free Kid's Run for children aged 6 and under. The..

The Rancho Hills Trail Run - Fall is an exciting trail running event set in the picturesque Rancho Cañada del Oro Open Space Preserve in Morgan Hill, California. Scheduled for November 8, 2025, participants can choose from various distances, including 5K, 10K, 8 Mile, 10 Mile, Half Marathon, 30K, Tr..

The Mt. Tam Trail Run, organized by Inside Trail Racing, offers a thrilling experience for trail runners of all levels. Set in the scenic Mt.Tamalpais State Park, the event features four race distances: 10K, Half Marathon, 30K, and 50K. Participants will enjoy breathtaking views as they navigate cha..

The Golden Gate Trail Classic will take place in San Francisco from Saturday 22 November 2025 to Sunday 23 November 2025. You can run between 15 and 50 miles.