Trail Running calendar near Fairfield 2026-2027

Join the Vampire Run in Roseville for a timed 5K or a 1 mile walk to support the bleeding disorders community. Enjoy a festive atmosphere with costumes, carnival games, and medals for all runners.

The NorCal Backyard Ultra is a unique last-person-standing trail race at Folsom Lake. Runners face a 4.2-mile loop each hour, with the main event having no set finish and a "Mini" version capped at 12 hours. Every participant receives custo..

The NorCal Backyard Ultra presents two endurance challenges at Folsom Lake. Runners tackle a 4.16-mile loop every hour, with a main Last Person Standing event and a 12-hour Mini version. All participants receive custom awards, and the event..

Explore the trails of Salmon Falls Ranch in the Gold Country foothills. Choose between a challenging half marathon or a 10K on a course featuring single-track, creek crossings, and views. The event supports the American River Conservancy's..

The Napa Fall Wine Country Marathon will take place in Calistoga on Saturday 24 October 2026. You can run between 10 and 26 miles.

Celebrate Halloween with a trail race through San Jose Hellyer County Park. Choose from distances including 5K 10K Half Marathon and Marathon with costume prizes and certified courses.

Support student programs and the Oakland Tech Cross Country team at Joaquin Miller Park. Choose between a five kilometer trail race or a one mile fun run through the redwood trees.

Event Details The Rio Del Lago 100 Mile Endurance Run is a trail race held on Saturday, November 7, 2026, starting at Beal's Point in Folsom Lake State Recreation Area, within the Sierra Foothills of California. Course Information The 100-m..

Mermaid Trail Run at Huddart Park in Woodside on November 7, 2026 features multiple trail distances, a timed 6 Hour challenge and a youth dash. The course is hilly, parking has a cash fee and a pancake breakfast follows the race.

Experience a scenic trail run around the Lake Chabot reservoir and hills. With distances from a 50 yard kids dash to a 50K ultramarathon there is an option for everyone at this Castro Valley event.

This November trail run takes on the iconic slopes of Mt. Tamalpais, starting at Stinson Beach. Runners can choose from four distances, from a 10K to a 50K ultramarathon, all featuring significant climbs and views. The event includes chip t..

Experience a flat and fast trail race through the scenic Quarry Lakes Regional Recreation Area in Fremont. Choose from a USATF certified half marathon, 10K, or 5K while enjoying views along the Alameda Creek Trail.

Celebrate Thanksgiving at Hellyer County Park with a trail race along Coyote Creek. Choose from a USATF certified half marathon, 10K, or 5K while competing for a chance to win a turkey.

Join a mostly flat and fast half marathon, 10K, or 5K in Fremont. Support the local food bank and earn a special connector medal by completing the Double Turkey Challenge over Thanksgiving weekend.

Escape the wrath of Krampus with this themed cross-country run in San Francisco or from anywhere. Choose from 5K, 10K, or a nine-mile course. All finishers get unique Krampus themed swag, including a woodallion and beer stein.

The Calero Trail Run (Winter) takes place on the trails of Calero County Park in San Jose. Runners can choose from a wide range of distances, from a 1-mile run to a 50K ultramarathon. The courses feature hills, single-track, and panoramic v..

The Hunter S. Thompson Fear & Loathing will take place in San Francisco on Sunday 6 December 2026. You can run between 50 and 50 miles.

Run through the redwoods and pines of Sanborn County Park. Choose from a half marathon, 10K, or 5K on scenic single-track trails. Walkers are welcome and all finishers get a medal.

Celebrate the final day of the year with a trail run at Lake Chabot in Castro Valley. Choose between half marathon, 10K, and 5K distances with options for runners and hikers alike.

Celebrate the first day of 2027 by running or hiking along the scenic trails of Lake Chabot. Choose between a half marathon, 10K, or 5K while supporting the East Bay Regional Parks Campership Program.