Trail Running calendar near Clayton 2025-2026

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 race features scenic routes that lead into the Sierra Az..

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, as well as 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 Almaden Quicksilver Park, 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 and 40% single..

The Rio Del Lago 100 Mile Endurance Run is a premier ultramarathon event held in the scenic Sierra Foothills of California, starting at Beal's Point. Scheduled for November 1, 2025, this challenging race features a diverse course that includes trails, paved paths, and stunning views of Folsom Lake...

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 NorCal Backyard Ultra is an endurance running event taking place at Folsom Lake’s Beals Point from November 7 to 10, 2025. This unique race format challenges participants to complete a 4.2-mile loop every hour until only one runner remains, with a separate Mini Last Person Standing event for tho..

The Lake Chabot Trail Run is an exciting running event taking place at Lake Chabot Regional Park in Castro Valley, California. Scheduled for November 8, 2025, the event features multiple race distances, 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 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 Falcon Crest Winter Trail Challenge is an exciting running event set in the scenic foothills of El Dorado Hills, California. Participants can choose from various distances, including 5K, 10K, 15K, Half Marathon, 30K, and a Trail Marathon, all featuring predominantly single-track trails with a mi..

The Darrington Single Track Trail Challenge is an exciting running event taking place in Pilot Hill, CA, featuring multiple race distances including a 36-mile, 18-mile, 10K, and 5K. Participants will enjoy scenic trails along the shores of Folsom Lake, characterized by rugged dirt paths and breathta..

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, as well as youth categories and a free Kid's Run. Participants can enjoy a scenic run along the Coyote Creek trail on Thanksgiving morning, wi..

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