Trail Running calendar near Stonestown 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 Inside Trail Santa Cruz Trail Run is a challenging outdoor race held at Henry Cowell Redwoods State Park, featuring 10K, half marathon, and 30K distances. Participants traverse scenic, technical dirt trails through towering redwoods, crossing rivers, and climbing ridges, with aid stations every..

Run-de-Vous is a community-focused running event held at Harvey Bear Ranch Park in San Martin, California, on August 29, 2025. The race features multiple distances, including 100 miles, 100K, 50 miles, marathon, 50K, and a 4-person 50M relay. The course is a fast, manageable 2-mile loop set against..

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, held at Diablo State Park in Clayton, California, offers a variety of scenic trail running events on September 7, 2025. Participants can choose from distances including 4 miles, 10 miles, half marathon, marathon, and 50K, with a free Kid's Run also available. The course feature..

The South Hills Single Track Trail Run - Summer is an exciting trail running event taking place at Calero County Park in San Jose, CA. Participants can choose from various distances, including a challenging 50K, Trail Marathon, 16 Mile, Half Marathon, 9 Mile, 10K, 5K, and a Kids Run. The course feat..

The Berkeley Trail Adventure is a trail running event held in Berkeley, California, featuring races of 10K, half marathon, 35K, and 50K distances. Taking place in Tilden Regional Park and Wildcat Canyon, the course offers scenic views of the bay, Golden Gate Bridge, and Mt. Tamalpais, with shaded tr..

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 a challenging trail race held in the scenic Las Trampas Wilderness near San Ramon, California. Scheduled for September 20, 2025, the event features a half marathon, 10K, and 5K distances. Known for its tough terrain and significant hills, the half marathon is n..

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 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 Spartan Trail - San Jose Trail Challenge takes place at Sanborn County Park in Saratoga, California, nestled on the eastern slopes of the Santa Cruz Mountains. This scenic event offers challenging trail runs with big climbs and fast descents on well-groomed, flowy singletrack trails through dens..

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 holders. Participants can choose from three distances: 10K, Half Marathon, and 35K, all featuring beautiful rolling hills and d..

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..