Trail Running calendar near Fairfield 2026-2027

Scenic races at San Leandro Marina on February 14, 2026, with half marathon, 10K, 5K and a remote runner option. The mostly flat bayside course stays close to the water and offers views of San Francisco and the Bay.

FOURmidable is a trail running event in Auburn, California offering 50K, 35.5K, half marathon and 13K races. Prize money is funded by runner donations matched up to $3,000, plus a $500 bonus for a 50K course-record break.

Redtail Ridge at Lake Chabot on February 21, 2026 features 5K to 50K trail races on mixed dirt trails, fire roads and some paved sections. The event is chip timed, cupless, and limited to 500 runners.

Explore scenic trails at Folsom Lake with the Lost Trail Half Marathon and 5K. The well-marked courses offer lake views and wildflowers. Awards celebrate top finishers and age group performers.

Montara Mountain Trail Run in Pacifica on Feb 21, 2026 offers distances from a 10K to a 50K plus a free kids 50 yd dash, marked courses, aid stations every 6 to 7 miles, and a cupless hydration policy.

This trail run in Walnut Creek's Lime Ridge area features unmapped courses. Runners follow a map to find checkpoints, choosing their own path through oak trees and quarries. Snacks await at the finish.

A point to point trail event near Coloma offering a 50K ultrarun and a new half marathon, organized by Coloma River Races to benefit Breakthrough T1D, with multiple aid stations, local finisher medals and age group awards.

The Zoom Angel Island will take place in Tiburon on Sunday 1 March 2026. You can run between 5 and 15 miles.

Way Too Cool brings a 50K and a 10 mile trail run to Cool, California on March 7, 2026, over rolling hills with creek crossings and staffed aid stations. Entries include race shirt, finisher medallion, timing, on course nutrition, and post..

Trail event near La Honda, CA offering 10K, half marathon and 50K routes across Skyline, Russian Ridge and Monte Bello preserves, with varied surfaces, multiple aid stations and specified cutoffs.

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.

A spring trail event at China Camp State Park offering live and virtual 5K, 10K and half marathon options. Courses include technical single track and substantial elevation and organizers do not offer refunds.

A long-distance trail event in Sausalito featuring a 50K and 50 Mile through Marin Headlands, Muir Woods, and Mt. Tamalpais, with live timing, aid stations, cupless provisions, and cash prizes for top 50 Mile finishers.

A multi-distance trail event on the Southside Trail at Folsom Lake featuring mostly single-track running, lake and Sierra views, technical sections, course markings, aid stations, and commemorative medals for finishers.

A trail running weekend in Marinwood, California, with 28K and 50K single loops plus a point-to-point 100K, featuring routes that summit several high points and offer wide views across the San Francisco Bay Area.

A themed trail event in Cool, California offering 50K, 25K and 10K on marked courses with mapped routes, aid stations, live timing, participant shirts and finisher medals.

A trail race at Bothe Napa Valley State Park on March 21, 2026 offering marathon, half marathon and 10K with a 300 runner limit. Courses use single track loops with one aid station and a six hour marathon cutoff.

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.

A community fundraiser in downtown Placerville on March 21, 2026 offering live and virtual 5K and 10K options to support New Morning Youth & Family Services and other local nonprofits serving seriously ill children.

A 22.5K event in Clayton, California on March 21, 2026, organized by Nomadic Adventure Club; registration closes March 20 and donations support the club’s free community initiatives.