Trail Running calendar near Fairfield 2025-2026

The Dirty Dozen Run is an annual trail running event hosted by Brazen Racing at Point Pinole Regional Shoreline in Richmond, California. Scheduled for July 12, 2025, it features 12-hour, 6-hour, and 3-hour endurance races on a scenic 3.37-mile loop composed mostly of dirt fire trails. The course off..

The Muir Woods Mountain Challenge, held in Mt. Tamalpais State Park near Stinson Beach, CA, offers trail runs of 10K, half marathon, and 30K distances. The course features a challenging 2,000-foot climb early on, scenic ridge-line views of Stinson Beach and the Pacific Ocean, and technical single-tr..

Blood, Sweat & Beers is a trail running event held in Auburn, California, nestled in the scenic American River Canyon. The race offers two challenging distances: a Long Course of 10.5 miles with 2,471 feet of elevation gain and loss, and a Short Course of 5.9 miles with 863 feet of elevation change...

The Calero Hills Trail Fest, held at Calero County Park in San Jose, CA, offers a variety of trail running distances including a marathon, 30K, half marathon, 10 miler, 10K, and 5K. The courses feature challenging ascents and descents through scenic old oak groves, single track trails, and dirt path..

The Folsom 100 is an exhilarating 100-mile ultramarathon that takes place around Folsom Lake, California. Scheduled for August 1, 2025, this challenging race features a point-to-point course with a single out-and-back section. Participants have 34 hours to complete the loop, which includes stunning..

The Rodeo Valley Trail Run, held in the scenic Marin Headlands near Sausalito, California, offers trail races of 8K, Half Marathon, 30K, and 50K distances. Starting near historic Fort Cronkhite and Rodeo Beach, the course features challenging steep climbs and descents along coastal trails with stunn..

The Skyline 50K Endurance Run, held annually in August at Lake Chabot Marina in Castro Valley, California, is the longest-running 50K race in the state and one of the oldest in the U.S. The course features a large loop through the scenic East Bay Regional Parks, reaching Skyline Gate. Known for its..

Bear Creek is a trail running event held in Lafayette, California, featuring a half marathon, 10K, and 5K distances. The courses are known for their challenging hills rather than being flat or fast, offering runners and hikers a scenic experience through Briones Regional Park. Participants receive c..

The Tamalpa Headlands 50K is a challenging ultramarathon held near Sausalito, California, featuring a single-loop course through Marin County's iconic trails such as Coastal, Miwok, Steep Ravine, Matt Davis, and Dipsea. The race covers 50 kilometers with approximately 6,500 feet of elevation gain, c..

The Almaden Hills Trail Run - Summer is a challenging trail running event held at Almaden Quicksilver Park in the scenic Almaden Valley, San Jose, California. The course features a mix of 60% dirt roads and 40% single-track trails with significant elevation gains, offering runners beautiful views an..

The Redwood (Summer) Trail Run, held in Oakland, California, offers a scenic race experience through Redwood Regional Park. Participants can choose from multiple distances including 5 miles, half marathon, 30K, marathon, 50K, and a free kids' 50-yard dash for children six and under. The course featu..

The Envirosports Angel Island Half Marathon & 10K is an annual event held at Angel Island State Park near Belvedere Tiburon, California. The race features a scenic, hilly loop trail that circumnavigates Angel Island, offering stunning panoramic views of the Golden Gate Bridge, San Francisco, Alcatra..

The Double Dipsea is a challenging 13.7-mile trail race held annually at Stinson Beach, California, celebrating its 55th running in 2025. The course follows the legendary Dipsea Trail from Stinson Beach to Mill Valley and back, featuring steep hills, numerous stairs, and stunning views. Unique to th..

The SPASM Crystal Springs Trail Run takes place in Woodside, California, at Huddart Park, offering runners a scenic experience through towering redwoods, lush ferns, and trails in Huddart Park, King's Mountain, and Bear Gulch. The event features multiple distances: 8K, Half Marathon, 35K, Marathon,..

The Stevens Creek Striders Reservoir Run, held in Cupertino, CA, offers a scenic trail running experience with distances of a half marathon (13.2 miles), 11K, and a 2.5-mile Lollipop Loop charity run/walk. The course features shaded single-track trails and open vistas, including challenging steep as..

The Mammoth Bar Trail Runs, hosted by Skybreaker Racing, is a trail running event held in Auburn, California, within the Auburn State Recreation Area. Scheduled for September 7, 2025, the event features three race distances: a half marathon, 10K, and 5K. The courses traverse the single-track and dou..

The Diablo Trail Run, held at Diablo State Park in Clayton, California, offers a variety of distances including 4 miles, 10 miles, half marathon, marathon, 50K, and a free kids' run for children 6 years and younger. The event features scenic courses with spectacular views of the San Francisco Bay Ar..

The South Hills Single Track Trail Run - Summer, held at Calero County Park in San Jose, CA, offers a variety of distances including 50K, trail marathon, 16-mile, half marathon, 9-mile, 10K, 5K, mile, and a kids run. The course features challenging single track trails, hills, dirt paths, oak trees,..

The Berkeley Trail Adventure is a scenic trail running event held in Berkeley, California, within Tilden Regional Park and Wildcat Canyon. It offers four race distances: 10K, half marathon, 35K, and 50K, featuring technical dirt trails, fire roads, and some asphalt sections. The course showcases sha..

The Gold Rush Growler Trail Runs, held at Granite Beach in Folsom Lake State Recreation Area, feature scenic 10-mile and 5K trail races along shoreline and single-track trails. The 10-mile course includes paved park roads, secret trails, and varied terrain with aid stations offering water, electroly..