Trail Running calendar near Clayton 2025-2026

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 Hunter S. Thompson Fear & Loathing is a unique ultra running event held annually in San Francisco, CA, since 1985. It offers two distances: a 50K and a 50-mile single-loop course starting and finishing at Twin Peaks, the city's highest viewpoint.The route covers iconic city landmarks and feature..

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 Hark the Herald Half Marathon will take place in Belvedere Tiburon on Saturday 13 December 2025. You can run between 10 and 13 miles.

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 distance, all featuring breathtaking single-track trails..

The Woodside Ramble is a scenic trail running event held at Huddart County Park in Woodside, California, featuring distances of 10K, Half Marathon, 35K, and 50K. Set amidst the forested slopes and canyons of Huddart and Wunderlich Parks, runners traverse moss-covered redwoods, mixed evergreen forest..

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..

Brazen New Year's Day is an annual running event held at Lake Chabot in Castro Valley, California. It offers a scenic and challenging course with three distance options: a half marathon, 10K, and 5K. The race takes place on January 1st, providing a festive and invigorating way to start the new year...

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 50K and Marathon options, all featuring increasing elevation gain through scenic Northern..

The IPA Beer Trail Runs, held at Granite Beach in Folsom Lake State Recreation Area, offer two scenic trail race options: a 5K and a 12K along well-marked single-track paths with beautiful lake views. The event combines challenge and fun, culminating in a festive atmosphere where runners over 21 can..

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 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. Aid stations are strategically placed throughout the course..

The Pacifica Foothills Trail Run, held at San Pedro Valley Park in Pacifica, CA, offers runners scenic trail races of 10K, half marathon, and 30K distances. Nestled in the Santa Cruz Mountain range foothills, the course features a challenging 1,900-foot climb up Montara Mountain North Peak with stun..

The Coyote Hills Run is a scenic running event held at Coyote Hills Regional Park in Fremont, California, featuring a half marathon, 10K, and 5K distances. The courses offer a mix of paved trails, dirt paths, and wooden boardwalks through marshlands, with minimal elevation gain despite the park's hi..

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, trail marathon, 30K, half marathon, 7-mile, 5K, mile, and a kids run.The longer courses traverse the scenic Sierra Azu..

The Escape from Folsom is a trail running event held at Granite Beach, Folsom Lake State Recreation Area. It offers two race distances: a 10-mile run and a 5K (3.1 miles), both featuring scenic trails adorned with wildflowers. The course includes multiple aid stations providing water, electrolyte be..

The Bay Breeze event in San Leandro offers a scenic and romantic running experience along the San Francisco Bay, starting and finishing at San Leandro Marina Park. Participants can choose from a half marathon, 10K, or 5K race, all featuring mostly flat, easy bayside trails that stay close to the wat..

Redtail Ridge is a trail running event held at Lake Chabot Regional Park in Castro Valley, California. The race offers multiple distances including 5K, 10K, half marathon, 30K, and 50K, catering to a wide range of runners from beginners to those seeking personal records. The course features eucalypt..

The Lost Trail Half Marathon and 5K take place at Granite Beach, Folsom Lake State Recreation Area, offering runners scenic lake views and vibrant wildflowers along well-marked courses. The half marathon covers 13.1 miles, while the 5K is 3.1 miles. The event features five aid stations strategically..

The Marin Ultra Challenge is a premier long-distance trail race held in Marin County, California, featuring 50-mile and 50K distances. The course offers about 11,000 feet of elevation gain for the 50-mile race, traversing scenic trails through the Marin Headlands, Mt. Tamalpais, and Muir Woods.Runne..