Trail Running calendar near Clayton 2025-2026

The Tamalpa Headlands 50K is a challenging ultramarathon set in the stunning Marin County, California, featuring iconic trails such as Coastal, Miwok, and Dipsea. Established in 1998 and presented by the Tamalpa Runners, this single-loop race offers approximately 6,500 feet of elevation gain, combin..

The 2025 Angel Island Half Marathon and 10K, hosted by Envirosports, marks its 35th annual event on August 23, 2025, at Angel Island State Park in Belvedere Tiburon, California. Participants will enjoy a scenic loop trail that offers stunning views of the Golden Gate Bridge, San Francisco, and Alcat..

The Double Dipsea is a challenging 13.7-mile trail run that takes place annually, starting at Stinson Beach, California. First held in 1970, this race is known for its unique handicapped start format, where slower runners begin first, creating a dynamic environment of constant passing on narrow trai..

The Santa Cruz Trail Run, scheduled for August 23, 2025, takes place in the scenic Henry Cowell Redwoods State Park, featuring a stunning landscape dominated by giant redwoods. Participants can choose from three race distances: 10K, Half Marathon, and 30K. The course includes a mix of single-track t..

The SPASM Crystal Springs Trail Run is an exciting running event taking place in Huddart Park, Woodside, CA. Scheduled for August 31, 2025, it features multiple race distances including an 8K, Half Marathon, 35K, Marathon, and 50K, along with a free Kid's Run for children aged 6 and under. Participa..

The Stevens Creek Striders Reservoir Run offers a scenic trail running experience in Cupertino, CA, featuring a Half Marathon, 11K, and a Lollipop Loop charity run. Participants can enjoy the beautiful trails of Stevens Creek County Park, with varying elevations and challenging terrains suitable for..

The Diablo Trail Run, scheduled for September 7, 2025, in Clayton, California, offers a variety of race distances including a 4-mile, 10-mile, half marathon, marathon, and 50K, along with a free Kid's Run for children aged 6 and under. The event takes place in the scenic Mount Diablo State Park, fea..

The South Hills Single Track Trail Run - Summer 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, Half Marathon, and shorter races down to a Kids Run. The course features beautiful single tr..

The Berkeley Trail Adventure is an exciting running event set in the scenic Tilden Regional Park and Wildcat Canyon in Berkeley, CA. Scheduled for September 13, 2025, participants can choose from various distances, including 10K, half marathon, 35K, and 50K. The course features a mix of shaded trail..

The Gold Rush Growler Trail Runs feature a 10-mile and a 5K race, taking place at Granite Beach, Folsom Lake SRA. Participants can enjoy scenic courses along the shoreline and single-track trails. The event includes new courses for 2025, with awards for top finishers and age group categories.Each co..

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 Rocky Ridge Trail Half Marathon is set to take place on September 20, 2025, at the scenic Las Trampas Wilderness in San Ramon, California. This challenging event features a half marathon, along with 10K and 5K options, catering to various skill levels. The half marathon is known for its rugged t..

The Dick Collins Firetrails will take place in Castro Valley from Saturday 27 September 2025 to Sunday 28 September 2025. You can run between 42 and 100 kilometers.

The 2025 San Jose Trail Challenge, hosted at Sanborn County Park, offers a thrilling experience for runners of all levels with distances of 10K, 21K, and 50K. Set against the stunning backdrop of the Santa Cruz Mountains, participants will navigate well-groomed yet challenging trails featuring signi..

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 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 in Orinda, CA, offers a unique opportunity to traverse the scenic trails around Briones Reservoir, typically restricted to permit-only access. Participants can choose from three distances: 10K, Half Marathon, and 35K, all featuring beautiful rolling hills a..

The Mile Madness Endurance Run is an exciting endurance event taking place from October 10-13, 2025, at the Sunset Whitney Recreation Area in Rocklin, CA. This unique race features a 1.05-mile loop course, primarily on dirt trails, allowing participants to choose from various timed challenges, inclu..

Granite Head 2025 is an exciting trail running event taking place in Granite Bay, California. Participants can choose between two challenging courses: a 6.6-mile short course and an 11.2-mile long course. Each runner will receive a unique tech shirt and can enjoy post-race festivities, including com..