Trail Running Calendar California 2025-2026

The Brazen New Year's Day event in 2026 offers participants a choice of three scenic running distances: a half marathon, 10K, and 5K, set against the beautiful backdrop of Lake Chabot in Castro Valley, California. This invigorating race takes place on January 1st, welcoming runners to kick off the n..

The Auburn Resolution Run is an exciting trail running event scheduled for January 1, 2026, at Overlook Park in Auburn, California. This event offers participants a choice of distances, including a 5K, 10K, 10-mile run, and a virtual run option for any distance. It serves as a perfect opportunity to..

The Hacienda Hills Trail Run - Winter is an exciting trail running event set in the scenic Almaden Quicksilver County Park near San Jose, California. Scheduled for January 3, 2026, participants can choose from nine different race distances, including a Kids Run, 5K, 10K, half marathon, marathon, and..

The Lost Coast 55K is an adventurous running event set in the rugged and remote backcountry of Humboldt County, California. Participants will tackle a challenging 34.3-mile course with approximately 6,500 feet of elevation gain, starting from the Horse Creek Mountain trailhead. The route features a..

The La Cuesta Ranch Trail Run is set to take place on January 24, 2026, in San Luis Obispo, California. This event offers three distance options: 10km, 20km, and 30km, all featuring scenic dirt trails and ranch roads with stunning views of the West Cuesta Ridge. Participants can expect well-marked c..

The Folsom Lake Sweetwater Trail Run is an exciting running event taking place at the Folsom Lake State Recreation Area, featuring a variety of distances including a Kids Run, 1 Mile, 5K, 10K, 9 Mile, Half Marathon, 30K, Trail Marathon, and 50K. The course is predominantly single-track, offering sce..

The Mt. Umunhum Trail Conquest - Winter 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, Marathon, 30K, Half Marathon, 7 Miler, 5K, and a Kids Run.The course features scenic trails that lead..

The Ranch 50K is a challenging trail running event held in the scenic Daley Ranch area of Escondido, California. Participants can choose between a 50K race, which consists of two 25K loops with a total elevation gain of 6,318 feet, or a half marathon with a single loop and 2,706 feet of gain. The co..