Trail Running Calendar California 2025-2026

Coyote Hills Run is a running event scheduled for January 24, 2026, at Coyote Hills Regional Park in Fremont, California. Participants can choose from various distances, including a 5K, 10K, and half marathon, with registration fees varying based on the timing of registration. The event promotes out..

The Sean O'Brien 100K is a premier trail running event taking place in Calabasas, California, featuring multiple race distances including 100K, 50 miles, 50K, a marathon (26.2 miles), and 30K. This event is recognized as a qualifier for the prestigious Western States 100. Participants can expect 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..

Bay Breeze 2026 is a scenic running event taking place at the San Leandro Marina Park, featuring a half marathon, 10K, and 5K races. Known for its picturesque views of San Francisco and the Bay, the course offers a mostly flat, easy trail ideal for both seasoned runners and beginners. Participants c..

The Ranch 50K is a trail running event taking place in the scenic Daley Ranch area of Escondido, California, on February 14, 2026. Participants can choose between a challenging 50K course, which consists of two 25K loops with a total elevation gain of 6,318 feet, or a half marathon with a single loo..

FOURmidable is an exciting trail running event set in the stunning Sierra Nevada foothills of Auburn, CA. Scheduled for February 21, 2026, the event features multiple race distances, including 50K, 35.5K, half marathon, and 13K, catering to runners of various skill levels. Participants can enjoy the..

The San Pasqual Valley Trail Race, set in the picturesque San Diego Wine Country, offers a scenic running experience with three distance options: a 10K, Half Marathon, and 20 Mile race. Participants will enjoy breathtaking views as they navigate through vineyards and orange groves, with the more cha..

The Salmon Falls 50K Endurance Run is a challenging trail race set in the scenic foothills of Sacramento, California. This ultra-distance event starts at the Magnolia Ranch Trail Head near Coloma and features a stunning course that traverses the Cronan Ranch area, ultimately finishing at Folsom Lake..

The Santa Barbara Nine Trails is a trail running event organized by AllWeDoIsRun, set against the stunning backdrop of California's Central Coast. Participants can choose between two distances: a challenging 35-mile course and a shorter 17-mile option. This event is designed for runners of various s..

The Nine Trails 35 Mile Endurance Run is a challenging trail running event organized by AllWeDoIsRun, set in the scenic landscapes of Santa Barbara, California. This endurance run is designed for experienced runners looking to test their limits over a 35-mile course, with an additional 17-mile optio..

The Old West Trail Runs feature a 50K, marathon, and half marathon, set against the stunning backdrop of Anza Borrego Desert. Participants can enjoy a scenic and runner-friendly course with manageable elevation gains, making it suitable for both seasoned runners and newcomers. The event promotes a f..

The Ruck a Chuck 50K is an exhilarating running event set in the scenic landscapes of Foresthill, California, taking place on March 14, 2026. This race offers participants a chance to traverse the iconic Western States Trail, known for its historical significance in endurance running. The course fea..

The Coast to Crest 10K and 5K is an annual trail race held in Del Mar, California, featuring a flat and fast course ideal for runners seeking personal records. Scheduled for March 21, 2026, this event offers stunning views of the lagoon and a downhill finish. Both the 10K and 5K courses are well-gro..

The Bad Ass Backyard Ultra, held in Rio Linda, California, is a unique running event where participants complete 4.16-mile loops within one hour, starting a new loop every hour on the hour. The event, which began as a grassroots gathering in 2023, has evolved into an official race under the Singletr..

The Nature Made Great Race is an annual running event held in Agoura Hills, California, featuring a variety of race distances including a half marathon, 10K, 5K, and a 1-mile fun run. Celebrating its 40th anniversary in 2025, the event is renowned for its scenic routes through the Santa Monica Mount..

The Nanny Goat event, now postponed to May 23-24, 2026, is a unique running experience held at a private horse ranch in Riverside, CA. Participants can choose from various race formats, including 6-hour, 12-hour, 24-hour, and a 100-mile challenge, with the goal of completing as many laps as possible..