Trail Running calendar near Fairfield 2026-2027

Experience an iconic trail run through the rolling hills and creek crossings of Northern California. Participants can choose between a classic 50 km ultramarathon or a 10 mile trail race ending with signature post race treats.

Explore the Santa Cruz Mountains on this trail run fundraiser. Choose from 10K, 21K, or 50K distances through scenic ridge preserves. Your entry fully supports the Bay Area Ridge Trail.

This event combines a scenic 5K trail run or a one-mile fun run/walk with a Polar Plunge fundraiser. The runs take place before participants brave the waters at Granite Bay Main Beach to support Special Olympics Northern California.

General Information The Terrible, Horrible, No Good, Very Bad Day is an unofficial, non-organized trail run on March 7, 2026. It offers three distance options: 50K (32 miles) with approximately 10,900 feet of elevation gain. 18 Miler (30K)..

Experience the scenic trails of Folsom Lake SRA with 31K, 10K, and 5K distances. Enjoy a well supported course with multiple aid stations, finisher awards, and post race food at Granite Beach.

Experience the trails of China Camp State Park with a 5K, 10K, or half marathon featuring technical terrain and custom finisher awards. Choose between the live spring event or a flexible virtual option.

Course and Location The Marin Ultra Challenge (MUC) is a trail race taking place in Marin County. The 11th edition of the event will be held on Saturday, March 14, 2026. The journey starts on Rodeo Beach and the courses traverse the Marin H..

This trail run along Folsom Lake features a scenic, mostly single-track course. Runners can choose from distances ranging from a 1 mile to a 50K. All finishers will receive a medal.

The Big Alta is a scenic trail running weekend in Marin County, California. It offers three challenging distances: a 100K point to point, a 50K loop, and a 28K loop, all summiting high points for vast Bay Area views.

Choose from three trail distances—50K, 25K, or 10K—starting from the Cool Staging Area in California. Each course features significant elevation change and a generous 10-hour cutoff for the longer races. All participants get a race shirt, a..

Run through the scenic single track trails of Bothe Napa Valley State Park. Choose from marathon, half marathon, or 10K distances on this popular course. Participation is limited to 300 runners for the annual trail event.

A trail event in Oakland through Redwood Regional Park offering distances from a kids 50 yd dash to a 50K. Marked loops, aid stations every 5 to 6 miles, cupless event.

Event Overview The 15th Annual Spirit of Benny 10K/5K Fun Run and Walk is a fundraiser supporting non-profit organizations that help seriously ill children and their families in El Dorado County, California. For this final edition, proceeds..

Experience the trails of Clayton at the Diablo Summit Challenge. Run a 22.5 km course starting at Mitchell Canyon Road and support local community initiatives through this outdoor adventure.

Join the 11th annual Mighty Dog Trail Runs at Folsom Lake featuring 10K and 5K distances. Runners and walkers can compete with their dogs for finisher medals and special canine bandanas on scenic granite trails.

The Lag Bon 10K is a trail race in Fairfax, CA, on March 22, 2026. This run supports clean water access and features a scenic, technical course around Marin's reservoirs.

Run through the Skyline Ridge Open Space Preserve on a scenic course featuring coastal views and gentle hills. All proceeds and matched entry fees support medical aid programs via The Hatuey Project.

Run a flat and fast course on the historic Western Pacific Trail in Fremont. Choose from a half marathon, 10K, or 5K starting at Quarry Lakes. The event is open to runners and walkers of all levels.

Run on the historic Western States trail at the Knickerbocker Canyon Trail Run. Choose from four distances, from a 5K to a challenging 35K, all starting from American River Overlook Park. The course features river views, the iconic No Hands..

Run the single-track trails alongside Folsom Lake in El Dorado Hills. The event offers four distances from a 5K to a half marathon, with technical sections and scenic views. All finishers receive a medal.