Trail Running calendar near Fairfield 2026-2027

Experience a fixed-time event at Crissy Field with stunning views of the Golden Gate Bridge. Run or walk as many laps as you choose in three six or twelve hour blocks as an individual or part of a team.

Trail races of 30K, 10K, 5K and a Kids 1K take place at Lagoon Valley Park in Vacaville. Courses are marked and supported with aid stations offering drinks and snacks.

A 5K run and walk on the trails of the Cosumnes River Preserve in Galt, CA, offered as an in-person outdoor event on June 13, 2026. The listing notes an overall duration of about three hours and free online ticket availability.

A community charity walk and run at Howarth Memorial Park supporting Dogwood Animal Rescue Project, with a 1.5 mile course and a virtual option that ships a race packet including a limited-edition dog bandana.

A community relay in Auburn pairs 100 runners for one-mile trail legs on a mostly uphill course while a parallel virtual option asks participants to complete 100 miles in 20 days at any pace. Both options list a $35 entry fee.

Live and virtual options at Lake Chabot feature 5K, 10K, and a half marathon with multiple aid stations, on-course nutrition, race apparel and a woodallion, post-race beverages, and a brewfest atmosphere.

A 10 mile trail race in Oakland that starts at Chabot Space and Sciences Center, featuring hilly single track and the Woodmonster climb. The event uses reverse handicap starts by age, includes a team competition, and a hill climb prize.

A community Independence Day event at Sycamore Grove Park featuring a flat 5K on mixed paved and dirt trails and a 400 meter kids run for ages 10 and under. T shirts are included with race fees.

A team navigation run in San Francisco starting at Ghirardelli Square where teams of one to five use a custom map to find checkpoints, with refreshments and social time after the finish.

Iron X is an extreme ironing half marathon in Auburn, CA where participants run the course and stop to iron a button up shirt at eight specified locations while carrying their own ironing gear and recording video proof.

Trail races of 10K, half marathon, and 30K run on technical dirt trails at Mt. Tamalpais near Stinson Beach, featuring steep climbs, ocean ridge views, marked aid stations, chip timing, and a cupless event policy.

Timed trail races at Point Pinole on July 25, 2026 offer 12 hour, 6 hour and 3 hour formats on a 3.37 mile loop with shoreline views and eucalyptus groves. Solo runners and two or three person teams are accepted, and entry includes an all d..

Trail running at Calero County Park with multiple distances across single track and dirt paths, significant climbs, aid stations and free parking at the park.

Trail run in Auburn California on July 26, 2026 featuring 10.5 miles and 5.9 miles courses through single-track, dirt roads and a canal system with steep sections named Cardiac and Last Gasp.

Coastal trail races in the Marin Headlands on August 1 offer 8K, half, 30K and 50K options across non-technical dirt trails with steep climbs, chip timing, cupless aid stations, and scenic views of the Pacific and the Golden Gate area.

A loop trail race from Lake Chabot Marina through East Bay Regional Parks with substantial climbing, offered as a 50K and 21K on August 2, 2026. Finishers receive a shirt, socks, and a medal.

A time based trail event at Skyline Wilderness Park in Napa where runners cover as much distance as possible in 3, 6, or 12 hour events on a 4.16 mile loop with significant climbing; cupless and chip timed, 500 runner capacity.

Trail races in Lafayette on August 8 2026 include a half marathon, 10K and 5K through Briones Regional Park. All courses have hills and use electronic chip timing; finishers receive medals and shirts.

A 50K ultramarathon in Marin County on August 15, 2026, running iconic Coastal, Miwok, Matt Davis and Dipsea trails with about 6,600 feet of elevation gain. Part of the USATF PA Grand Prix and offering a $10,000 podium purse.

Experience the trails of Redwood Regional Park in Oakland. Runners can choose from distances ranging from a 50 yard kids dash to a 50K ultramarathon through scenic ridge lines and redwood groves.