Trail Running Calendar California 2026-2027

Choose your challenge at the Pirate's Cove timed endurance run, set on a scenic 2-mile loop around Lake Cuyamaca in the mountains. The event offers 6-hour, 12-hour, and 24-hour distances starting at 8 a.m., with on-site dining and supplies..

The Big Alta is a scenic trail running weekend in Marin County, California. It offers three challenging distances: a 100K point to point, a 50K loop, and a 28K loop, all summiting high points for vast Bay Area views.

Choose from three trail distances—50K, 25K, or 10K—starting from the Cool Staging Area in California. Each course features significant elevation change and a generous 10-hour cutoff for the longer races. All participants get a race shirt, a..

Experience the breathtaking hills and canyons of Southern California with distances ranging from 10k to a 50k ultra. Run through lush spring landscapes and conquer challenging ridgelines with panoramic valley views.

Run through the scenic single track trails of Bothe Napa Valley State Park. Choose from marathon, half marathon, or 10K distances on this popular course. Participation is limited to 300 runners for the annual trail event.

Experience the beauty of Redwood Regional Park in Oakland with distances ranging from 5 miles to a 50K ultramarathon. Run through towering redwood groves and along scenic ridges in this spring trail event.

Join the final edition of this historic Placerville fundraiser featuring 5K and 10K distances on the El Dorado Trail to support youth and family services.

Explore the trails of Whiting Ranch Wilderness Park in Orange County. Choose from four distances, from a 6k to a 30k, on courses with views through oak woodlands. The event is well-supported and offers participant gear.

Experience a scenic trail run through oak lined canyon paths in Camarillo while supporting low cost horse riding programs. This inaugural event features a fast 5K and a Kiddie K for young participants.

Run through the rugged high desert and Sawtooth Mountains in this scenic trail event benefiting cancer research. Choose between a 10K or Half Marathon course starting from the historic Mane Street in Pioneertown.

Test your endurance at Monserate Mt. Preserve with 6 and 12 hour trail running options. Complete as many loops as possible solo or as a team while enjoying local trails and a fully stocked aid station.

Experience the trails of Clayton at the Diablo Summit Challenge. Run a 22.5 km course starting at Mitchell Canyon Road and support local community initiatives through this outdoor adventure.

Join the 11th annual Mighty Dog Trail Runs at Folsom Lake featuring 10K and 5K distances. Runners and walkers can compete with their dogs for finisher medals and special canine bandanas on scenic granite trails.

The Lag Bon 10K is a trail race in Fairfax, CA, on March 22, 2026. This run supports clean water access and features a scenic, technical course around Marin's reservoirs.

Run through the Skyline Ridge Open Space Preserve on a scenic course featuring coastal views and gentle hills. All proceeds and matched entry fees support medical aid programs via The Hatuey Project.

The Coast to Crest offers a flat and fast 10K and 5K on hard-packed trails in Del Mar. Runners enjoy spectacular lagoon views and a downhill finish. It's the final championship qualifier for the series.

Run a flat and fast course on the historic Western Pacific Trail in Fremont. Choose from a half marathon, 10K, or 5K starting at Quarry Lakes. The event is open to runners and walkers of all levels.

Run on the historic Western States trail at the Knickerbocker Canyon Trail Run. Choose from four distances, from a 5K to a challenging 35K, all starting from American River Overlook Park. The course features river views, the iconic No Hands..

Experience the 16th annual spring edition of this trail event in Los Angeles. Runners can choose from multiple distances including a new 50 mile ultra and family friendly 10k routes through Griffith Park.

Experience the scenic foothills of El Dorado Hills on single track trails overlooking Folsom Lake. Choose from four race distances ranging from a 5K to a Half Marathon through rolling hills and oak groves.