Trail Running Calendar California 2025-2026

The Fremont Canyon 28k Trail Run is an exciting running event taking place in Irvine Regional Park, Orange, California. Scheduled for December 6, 2025, this challenging 28k (17.5 miles) course features fire roads with an elevation gain and loss of 2860 feet, making it suitable for experienced runner..

The Ray Miller 50/50 is an exciting running event taking place in Point Mugu State Park, Malibu, CA. Participants can choose from three challenging distances: a 50 Miler, a 50K, and a 30K, catering to various skill levels and preferences. This event promises a scenic and adventurous experience, set..

The Hunter S. Thompson Fear & Loathing event is a renowned ultra-running race held annually in San Francisco, CA, celebrating its 41st edition in December 2025. Participants can choose between a 50K and a 50-mile course, with no entry fee required.The race features a mix of city streets and parallel..

The Tenth Annual Keepin' It Rural 5K/10K Trail Race and Festival takes place at the scenic Elfin Forest Recreational Reserve in north San Diego. This unique event features chip-timed races for both 5K and 10K runners, with a special course for hikers. The race begins and ends at the Olivenhain Dam,..

The Hark the Herald Half Marathon & 10K is a scenic running event taking place on December 13, 2025, at Angel Island State Park in Belvedere Tiburon, California. Celebrating its 37th annual edition, the race features a challenging loop trail that offers stunning views of the Golden Gate Bridge, San..

The Summit Rock Half Marathon, along with 10K and 5K events, takes place in the scenic Sanborn County Park, nestled in the Santa Cruz Mountains near Saratoga, California. Participants can enjoy running through beautiful redwood groves and along single-track trails, with options for both experienced..

The Crystal Cove Trail Run is a premier running event set in the scenic Crystal Cove State Park, Laguna Beach, California. Participants can choose between a challenging 15k and a 6k course, both featuring fire road climbs, ridgeline descents, and thrilling single track trails. The 15k route includes..

The Dixon Lake Trail Race, held annually in beautiful Daley Ranch, Escondido, features a 10-mile and 10K race that begins at El Caballo Park. Runners will ascend to the top of Stanley Peak, enjoying stunning 360-degree views along the way. The race includes elevation gains ranging from 900 to 1300 f..

The Folsom Lake Point to Point Trail Half Marathon is a scenic running event taking place in El Dorado Hills, CA, featuring a predominantly single-track trail that runs alongside the picturesque Folsom Lake. The course offers a mix of technical sections and gentle rolling hills, providing runners wi..

The Paramount Ranch Trail Runs is an exciting running event scheduled for December 2025 in Agoura Hills, California. Participants can choose from various distances, including a 50K, marathon, 30K, half marathon, and 10K, catering to runners of all levels. The event promises a scenic experience on th..

The Placerville's Holiday Jingle & Mingle Run is a festive running event held on the El Dorado Trail in historic Placerville, California. Participants can choose from various distances, including a half marathon, 15k, 10k, 5k, and a kids run, all set against a scenic backdrop of oak trees and rollin..

The Brazen New Year's Eve event offers participants the chance to run a half marathon, 10K, or 5K at Lake Chabot in Castro Valley, California. This event is designed for runners of all levels, including hikers and walkers, making it an inclusive experience. It serves as a perfect opportunity to fini..

The Brazen New Year's Day event in 2026 offers participants a chance to kick off the new year with invigorating races at Lake Chabot in Castro Valley, California. Runners can choose from a half marathon, 10K, or 5K, making it suitable for various fitness levels. The event encourages participants to..

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 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 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, this event features nine different race distances, including a Kids Run, 5K, 10K, half marathon, marathon, and a challe..

The Del Dios Trail Race, also known as the "Race of the Gods," is an annual running event held at Lake Hodges in Escondido, California. Scheduled for January 4, 2026, this 11th edition features various race distances, including a 50K, half marathon, 10K, and 5K, all set against the stunning backdrop..

The San Diego 50 Mile & Trail Marathons is a diverse running event taking place in Escondido, California, featuring multiple race options including a 50-mile ultra marathon, trail marathon, marathon relay, heavy half marathon, and various shorter distances for all ages. The event emphasizes inclusiv..

The La Cuesta Ranch Trail Run is scheduled for January 24, 2026, in San Luis Obispo, California. This event features three distances: 10km, 20km, and 30km, all set on scenic dirt trails and ranch roads with stunning views of the West Cuesta Ridge. Participants can expect a well-marked course, fully..

The Folsom Lake Sweetwater Trail Run is an exciting running event taking place at the Folsom Lake State Recreation Area. Scheduled for January 24, 2026, participants can choose from various distances, including a Kids Run, 1 Mile, 5K, 10K, 9 Mile, Half Marathon, 30K, Trail Marathon, and 50K. The cou..