Trail Running calendar near Fairfield 2026-2027

A trail event at Joaquin Miller Park on May 30, 2026 offering 8K to 50K distances plus a free kids 50yd dash. Routes run through redwood forest on marked single track with aid stations every 3 to 6 miles.

This community event features a 5K and 10K run/walk through Coyote Point Park, followed by a free Wellness Fair. Registration includes a T-shirt, and participants are welcome with strollers and dogs. The day focuses on health and mental wel..

These trail runs explore the beautiful Sonoma Coast State Park. The courses traverse a scenic ridgeline with ocean views and summit Red Hill. The event will return in 2027 with a planned new location in Monte Rio.

The Dirt Circus - San Francisco will take place in San Francisco on Saturday 6 June 2026. You can run between 3 and 5 miles.

A scenic 10km loop trail run in Cool, California. The course features rolling hills, canyon views, and a fully stocked aid station midway.

The Coolest 10km Trail Run is set for June 6, 2026 in Cool, CA. Participants will run a 10km course on the scenic Olmsted Loop Trail.

A trail event in Castro Valley on June 7, 2026 offering a chip timed half marathon and 5K with on-course water, first aid support, guaranteed t-shirts for early registrants, and age division awards.

The Bay Area 100 is a point-to-point 100-mile ultramarathon journey through the East Bay hills, starting at UC Berkeley. With 18,000ft of climbing and a 33-hour limit, it traverses diverse terrain from redwood forests to exposed ridges. It..

A multi distance trail event near Cool California using two main loops to create races from a 5K to a 100K. Courses use single track and fire roads, include aid stations, live tracking, timing chips, and finisher medals and shirts.

A 100-mile trail race in Cool, California using repeated 13.5- and 11.5-mile loops, with single track and fire roads, aid stations, live tracking, a 37-hour finish cutoff, and pacers allowed after mile 38.5.

The Pena Passage offers trail races through the scenic Lagoon Valley Park. Choose from a challenging 30K with technical trails or shorter 5K and 10K routes. The event includes aid stations and a partnership supporting mental health awarenes..

Live and virtual 5K, 10K and half marathon at Lake Chabot Regional Park in Castro Valley, June 26 to 29, 2026. Courses mix paved and trail sections with aid stations; live participants receive a shirt, handcrafted woodallion and beer sample..

The Bay 2 Bankers 10K will take place in Crissy Field East Beach on Saturday 4 July 2026. You can run between 5 and 10 kilometers.

Trail races on Mt. Tam near Stinson Beach offering 10K, half marathon, and 30K courses with steep climbs, technical single-track, cupless aid stations, chip timing, and a 300-runner capacity.

Trail races in Auburn, CA on July 26, 2026 with long and short courses across single-track mountainous trails, canal sections and dirt roads. Post-race items include a tech shirt, finisher medal, beer for age 21 or older and food.

Trail races at Rodeo Beach in the Marin Headlands offering 8K, half marathon, 30K and 50K on coastal singletrack and fire roads; chip timed, cupless, capacity 350.

One of America's oldest 50k races loops through East Bay parks. It's known for strong community support and a post-race plant-based BBQ. The event happens every August at Lake Chabot Marina.

Bear Creek 2026 offers a hilly half marathon, 10K, and 5K on August 8 in Lafayette, CA. The scenic trail course features beautiful views and a rewarding downhill finish. All finishers get a custom medal and shirt, and walkers are welcome.

A single loop 50K ultramarathon in Muir Beach, California on Saturday, August 15, 2026. The course uses notable Marin trails, includes about 6500 feet of elevation gain, and features coastal and Bay Area views.

An orienteering style 5K and 10K in San Francisco where solo runners or teams of up to five use a custom map to visit up to 30 checkpoints, answer simple multiple choice questions, and enjoy refreshments at the finish.