Trail Running Calendar California 2025-2026

The Trail Run at Sly Park - Fall is an exciting running event taking place at the Sly Park Recreation Area in Pollock Pines, California. Participants can choose from various distances, including a 50K, Trail Marathon, 17 Miler, Half Marathon, 8 Miler, 10K, and 5K, allowing runners of all levels to j..

The Machete Trail Madness 100 Miler is a challenging ultramarathon event held in Lake Perris, California, featuring a 100-mile, 50-mile, and 10-mile race. Scheduled for October 31, 2025, this event celebrates Dia De Los Muertos with a supportive community atmosphere. Participants will tackle a tough..

The Oakland Tech 5km Fundraiser Race and 1 Mile Fun Run/Walk is an exciting event taking place at Joaquin Miller Park, aimed at supporting the Oakland Tech Cross Country and Track Team. Participants can choose between a challenging 5K trail run or a more leisurely 1-mile fun run/walk, both set again..

The Rancho Ramble Trail Run will take place in Santa Margarita on Sunday 2 November 2025. You can run between 10 and 50 kilometers.

The NorCal Backyard Ultra is an endurance running event taking place at Folsom Lake’s Beals Point, featuring two main races: the Last Person Standing and the Mini Last Person Standing. Participants must complete a 4.2-mile loop every hour, with the Last Person Standing competing until only one runne..

The Catalina Island Half-Marathon & 10K is a premier trail running event set to take place on November 8, 2025, in Avalon, California. Participants will experience a challenging course that includes steep climbs and breathtaking views of the Pacific Ocean, starting near the historic Wrigley Mansion...

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 a marathon, 30K, half marathon, 15K, 10K, and 5K, all featuring predominantly single-track dirt trails with rolli..

The Tierra Redonda Mountain Trail Run is an exciting trail running event scheduled for November 15, 2025, in Bradley, California. Participants can choose from various distances, including 5km, 10km, 20km, as well as 24-hour and 48-hour challenges. This event is organized by AllWeDoIsRun, which is de..

The Darrington Single Track Trail Challenge is an exciting running event taking place in Pilot Hill, CA, on November 22, 2025. Participants can choose from various distances, including a 36-mile, 18-mile, 10K, and 5K race. The course offers a scenic experience along the shores of Folsom Lake, featur..

The Quarry Turkey Half Marathon is a family-friendly running event taking place on November 29, 2025, at Quarry Lakes Regional Park. This Thanksgiving weekend tradition features a half marathon, 10K, and 5K, along with a free "Little Turkeys" race for children. Participants are encouraged to wear Th..

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

The Krampus Cross Country event offers participants a choice between a 5K, 10K, or a Naughty Nine Miler, available both live in San Francisco and virtually from December 5 to December 8, 2025. The event encourages runners to "pay penance to Krampus" and features a festive atmosphere with unique swag..

Into The Wild Fremont Canyon is part of the OC Trail Runs series, featuring a 28k race set in the scenic Fremont Canyon. This event invites participants to experience the beauty of Southern California's natural landscapes while challenging themselves on diverse terrain. The race emphasizes the thril..

The Death Valley Trail Marathon is an exciting running event that features both a full marathon and a half marathon, set against the stunning backdrop of Death Valley National Park. Participants can expect a challenging course that showcases the unique desert landscape, with opportunities to experie..

The Hunter S. Thompson Fear & Loathing event is a renowned ultra-running race held annually in San Francisco, CA, since 1985. The event features two main distances: a 50K and a 50-mile race, with no entry fee required.Participants navigate a course primarily on city streets, with some trail options ..

The Crystal Cove Trail Run is a premier running event set in the scenic Crystal Cove State Park, Laguna Beach, California. Participants can choose from three distances: the challenging 15k, which includes steep climbs and technical sections like the Rock Garden, Elevator, and the Wall; the 6k; and a..

The Folsom Lake Point to Point Trail Half Marathon is a scenic running event taking place in El Dorado Hills, CA, featuring a course that is 95% single track and 5% dirt road. Runners will enjoy beautiful views of Folsom Lake, oak trees, and the Sierra Mountains while navigating gentle rolling hills..

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..