Trail Running calendar near Fairfield 2026-2027

A 10-mile trail race in Redwood Regional Park starting and finishing at Chabot Space & Sciences Center, featuring single-track trails, steep climbs including the Woodmonster, staggered handicap starts and a team competition.

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 map-based mystery run from Ghirardelli Square through classic San Francisco neighborhoods, with team navigation, chip-tagged checkpoints, 5K and 10K options, age and gender divisions, and post-event snacks and socializing.

Join a monthly community event in Richmond featuring a conversational hike or a self paced trail run. This inclusive series held on first Saturdays brings people together for outdoor movement and connection.

A half marathon in Auburn, CA that mixes running with extreme ironing. Participants carry their own boards and irons, perform recorded ironing stops at specified local sites, and must be entirely self-supported.

Trail runs on Mt. Tam near Stinson Beach with 10K, Half, and 30K options across technical trails and major elevation changes; cupless aid stations, chip timing, and a 300-runner field.

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.

A trail run in Auburn, CA on July 26, 2026, offering 10.5- and 5.9-mile courses through the American River Canyon with single-track trails, canal sections, notable climbs, race swag, post-race food and a beer for 21+ finishers.

A trail race in the Marin Headlands with 8K, half, 30K and 50K options along coastal single-track and fire roads, marked courses, cupless aid stations, and a 350 runner capacity.

Trail races of 50K and 21K in Castro Valley that start and finish at Lake Chabot Marina. Organized by Scena Performance, the event features community volunteer aid stations, finisher swag, GPX files, and UTMB indexing.

A time-based trail event at Napa’s Skyline Wilderness Park with 12, 6, and 3 hour options plus relays, main loops of about 4.1 miles with 815 feet elevation per loop, and a short finishing loop for the final 40 minutes.

A trail event in Lafayette, CA on August 8, 2026 offering a half marathon, 10K, 5K and remote entry, with chip timing, finisher medals, event shirts, hiker-friendly options and a final shaded single track descent.

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.

Trail races on hilly mixed dirt and single track at Almaden Quicksilver Park with distances from 5K to 50K, aid stations, drop bag service for longer races, and mandatory course markings and cutoffs.

A five kilometer trail run along the Lands End Trail in San Francisco with views of the Golden Gate and the Pacific Ocean. The event lists a $10 entry fee, awards finisher ribbons, and requests no headphones or pets on course.

Oakland Cubs Back2School 5K and Fun Run on August 16, 2026 takes place at The Meadow in Oakland and raises funds for the youth running team and its scholarship programs. Distances include a 5K and a fun run.

A map-based 5K and 10K in San Francisco where teams navigate checkpoints and answer multiple-choice questions, followed by refreshments at the finish.

A 13.7 mile trail race from Stinson Beach to Mill Valley and back on the Dipsea Trail. The annual handicapped event uses adjusted start waves and time cutoffs; 2026 marks the 56th running.