Trail Running calendar near Aptos 2026-2027

A point to point half marathon to the summit area of Mt. Umunhum on March 8, 2025, covering about 13.35 miles with 4,767 feet of ascent, marked mainly by pink ribbons and supported by aid stations with toilets.

A multi-distance trail event on March 22, 2025 at Calero County Park in San Jose offering runs from a kids race to a 50K, single track and dirt-road courses, multiple aid stations, and per-distance time limits.

Multiple trail distances run through Redwood Regional Park on March 20, 2027 at Chabot Space & Science Center. Routes use East Ridge, West Ridge, Stream and Bridle trails and distances were measured with a Rolatape surveyor's wheel.

Western Pacific 2027 stages a half marathon, 10K and 5K on a mostly flat course at Quarry Lakes Regional Recreation Area in Fremont on March 27, 2027, with tiered registration and a remote runner option.

A spring trail race at Pueblo Day Use Area in Santa Teresa County Park on April 5, 2025 offering 5K, 10K, 10 Mile and a half marathon across marked, hilly trails with aid stations and a four hour half marathon limit.

A multi-distance Spartan obstacle race weekend at Stanislaus County Parks on Apr 3-4, 2027, featuring Sprint, Super, Beast, Ultra and kids races across technical trails, grasslands and hills with signature obstacles and team options.

A trail running event in Walnut Creek on April 3, 2027 offering 50K, half marathon, 10K, 5K and a remote option. Part of entry fees support Save Mount Diablo and its land conservation work.

A trail event at Skyline Ridge Open Space Preserve offering distances from a 50 yard kids dash to a 50K race. Routes run largely on the Bay Area Ridge Trail with ocean and Santa Cruz Mountains views.

A trail event at Lake Chabot Regional Park offering distances from a 50‑yard kids dash to a 50K ultramarathon. The looped course circles the Lake Chabot reservoir and surrounding hills with measured distances.

No Foolin' Foot Race in San Carlos on April 24, 2027 offers 15K, 10K, 5K and a 1K kids trail course across Big Canyon, Eaton and Pulgas Ridge, with proceeds supporting local open space trail maintenance.

Run for Amma is a charity trail event at Skyline Ridge Open Space Preserve in Los Gatos offering 50K, 30K and 10K courses, with all registration proceeds donated to a UCSF cancer research lab.

A weekend of Spartan obstacle races at Toro Park near Salinas with Sprint, Super and kids distances on wooded, hilly trails. Team entries, volunteer options, spectator access, and a service member discount are available.

Trail races of 10K, half marathon, and marathon at Toro Park, Salinas on May 30, 2027, over rocky trails and dirt roads with summer temperatures around 16ºC and an average altitude of 520 meters.