Trail Running calendar near Fairfield 2025-2026

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

The Quarry Turkey Half Marathon is a family-friendly Thanksgiving weekend running event held at Quarry Lakes Regional Park in Fremont, California. It features a mostly-flat, fast course on beautiful trails, offering a half marathon, 10K, and 5K distances. A special free "Little Turkeys" sprint of ab..

The ZombieRunner Quarry Lakes event, held at Quarry Lakes Regional Recreation Area in Fremont, CA, offers a variety of race distances including 5K, 10K, Half Marathon, 30K, Marathon, and age-specific 5K and 10K races, plus a free Kid's Run for children 6 and under. The courses are flat, fast, and sc..

The Calero Trail Run - Winter takes place at Calero County Park in San Jose, California, offering a variety of distances including 50K, trail marathon, 25K, half marathon, 15K, 10K, 5K, mile, and a kids run. The course features diverse terrain with single track trails, hills, dirt paths, oak trees,..

The Peacock Gap Trail Run, hosted by Inside Trail Racing, takes place at China Camp State Park in San Rafael, California. Scheduled for December 6, 2025, the event offers three distances: 10K, half marathon, and 30K, with courses featuring scenic single-track trails, forested areas, and views of Mt...

The Hunter S. Thompson Fear & Loathing is a unique, no-fee urban ultra running event held annually in San Francisco, CA, since 1985. Participants can choose between a 50K or 50-mile single-loop course that starts and finishes at Twin Peaks, offering stunning city vistas.The route covers iconic touri..

The Folsom Lake Point to Point Trail Half Marathon is a scenic trail race held in El Dorado Hills, California, near Sacramento. The 13.1-mile course is predominantly single track (95%) with some dirt road (5%), running alongside the picturesque Folsom Lake. Runners experience a mix of gentle rolling..

The Doomsday 50K & Half Marathon takes place in Cool, California, offering runners a challenging and scenic race experience. The 50K features 5,100 feet of elevation gain and loss, while the Half Marathon includes 1,250 feet. Both races start together at the Cool Staging Area.The event welcomes hike..

The Hark the Herald Half Marathon & 10K is an annual running event held at Angel Island State Park near Belvedere Tiburon, California. Celebrating its 37th year in 2025, the race features a scenic, hilly loop trail around Angel Island with stunning views of the Golden Gate Bridge, San Francisco, Alc..

The Summit Rock Half Marathon, held in Saratoga, California, offers runners and walkers a scenic experience through the redwood groves of Sanborn County Park in the Santa Cruz Mountains. Participants can choose from a half marathon, 10K, or 5K race, all featuring breathtaking single-track trails sha..

Placerville's Holiday Jingle & Mingle Run takes place on the scenic El Dorado Trail in historic Placerville, California. The event offers multiple race distances including a half marathon, 15k, 10k, 5k, mile, and a kids run, accommodating runners of all levels. The course features beautiful oak tree..

The Brazen New Year's Eve event, held at Lake Chabot in Castro Valley, California, offers runners and walkers the opportunity to participate in a half marathon, 10K, and 5K trail races. This festive race encourages participants to close out the year with a scenic run on beautiful trails, welcoming a..

The Auburn Resolution Run is a trail running event held at Overlook Park in Auburn, California. Scheduled for January 1, 2026, it offers multiple race distances including 5K, 10K, 10 miles, and a virtual run option for any distance. This event provides a refreshing and adventurous way to start the N..

Brazen New Year's Day is an annual running event held at Lake Chabot in Castro Valley, California. It offers participants the choice of a half marathon, 10K, or 5K race, all set on scenic trails around the lake. The event is known for its invigorating course featuring challenging ascents and descent..

The Hacienda Hills Trail Run - Winter is a trail running event held at Almaden Quicksilver County Park near San Jose, California. It offers nine race distances ranging from a Kids Run and 1 mile to challenging ultra distances like 50K and a trail marathon. The courses feature increasing elevation ga..

The IPA Beer Trail Runs, hosted by TBF Racing, take place at Granite Beach, Folsom Lake State Recreation Area in California. The event features two scenic trail races along the lake's shoreline: a 12K (7.5 miles) and a 5K (3.1 miles), both on well-marked single-track trails. Runners enjoy a challeng..

The Coyote Hills Run is a scenic running event held at Coyote Hills Regional Park, located at 9400 Quarry Road, Fremont, California, along the eastern shoreline of San Francisco Bay. The event offers multiple race distances including a 5K, 10K, and a half marathon, welcoming runners and hikers alike..

The 2026 Gumby 10K and 5K are trail running events held at Granite Beach, Folsom Lake State Recreation Area. The races feature scenic courses along the shores of Folsom Lake, with well-marked trails and enthusiastic volunteers providing support. Participants can enjoy aid stations offering water, el..

The Folsom Lake Sweetwater Trail Run, held at Folsom Lake State Recreation Area in El Dorado Hills, CA, offers a variety of distances including Kids Run, 1 Mile, 5K, 10K, 9 Mile, Half Marathon, 30K, Trail Marathon, and 50K. The course is predominantly single-track (95%) with some dirt road sections,..

The Mt. Umunhum Trail Conquest - Winter is a trail running event held at Almaden Quicksilver County Park in San Jose, California. The race offers multiple distances including a 50K, marathon, 30K, half marathon, 7-mile, 5K, mile, and a kids run.The longer courses traverse the scenic Sierra Azul Open..