Trail Running Calendar California 2026-2027

Trailquake 2026 is a trail event in Saratoga on May 10 offering 5K, 10K and a half marathon through redwoods and pine forest, with local and remote entry options and finisher shirts.

A community Mother's Day event at Pinto Lake County Park on May 10, 2026 offering a 1K family fun run, 5K run and walk, and 10K run to benefit Pajaro Valley Shelter Services.

A two-day Spartan Trifecta Weekend at Big Bear Mountain Resort featuring Sprint, Super and Beast obstacle races at high altitude with long climbs and descents; kids races and spectator access are also available.

Trail runs at Skyline Wilderness Park in Napa offer distances from 10K to 50K with steep Rim Rock climbs and valley views. Aid is touchless and parking is included with registration.

Run for Amma is a charity trail event on May 16, 2026 at Skyline Ridge Open Space Preserve near Los Gatos. Multiple distances from 10K to 50K are offered and all registration proceeds support UCSF cancer research.

An inaugural trail ultramarathon in Napa offering a 50 mile solo and a two-person 50 mile relay over two long loops through Skyline Wilderness Park and Suscol Headwaters, run as a cupless event with four aid stations and limited crew access..

Born To Run Ultra Marathon in Los Olivos CA on May 16, 2026 offers distances from 10 miles to 100 miles plus 3- and 4-day formats; registration opens December 1, 2025.

Trail races at O'Neill Park in Trabuco Canyon, California on Saturday, May 16, 2026. Distances range from 10k to 50k; registration closes May 1 and entries are nonrefundable with a rollover option if canceled for weather or fire.

A multi distance trail event around Millpond Recreation Area near Bishop, California, featuring high altitude routes on dirt roads and single track, regular aid stations with medical support, and custom finisher medallions.

A race in El Sobrante on May 16, 2026 offering Half Marathon, 10K and 5K distances plus a remote runner option. Tiered registration fees apply and the event supports the East Bay Regional Parks Campership Program.

Wild Rose Half Marathon & 5K in Roseville on May 16, 2026 offers a half marathon on the Pleasant Grove Bike Path and a 5K through William Hughes Park. Paved courses include multiple aid stations and post-race swag including a technical shir..

An 80s inspired martial arts themed race day in Canoga Park on May 16, 2026 offering 5K, 10K and a 13.1 mile half plus a virtual option with medal shipping.

Trail race at Corral Canyon Campground on 05/16/26 offering looped courses from a 5 mile scramble to a 50K across rocky single track, jeeping trails and sandy sections, with aid stations and camp access for drop bags.

A point-to-point Half Marathon on May 16, 2026 in Almaden Quicksilver County Park, running from Mt. Umunhum down to the Hacienda Entrance with 1,909 ft of ascent, marked ribbons, aid stations and a 5.5-hour time limit.

A 10 km high altitude trail race at Snow Summit near Big Bear on May 17 2026. The route follows singletrack through pine forest with technical climbs and a three hour finish cutoff.

Mud Factor Sacramento is a 5K mud and obstacle run on May 17, 2026 at the 300-acre Mahon Ranch, marking the event's 15th anniversary; it features adult and KIDZ family waves and a $10 spectator festival pass.

A community cross-country event at Spring Lake Regional Park featuring a 3 mile XC race and a 1K Bunny Hop for children 10 and under, in its 30th year with online registration and membership options available.

A multi-distance loop ultrarun at a private ranch in Riverside, CA, featuring one-mile laps, timed solo and relay options, free on-site camping, and awards for distance milestones over Memorial Day weekend.

An 8 mile uphill race to the historic ghost town of Cerro Gordo near Keeler, California, gaining about 4,600 feet. The event includes aid stations, a mountaintop barbecue and music, shuttle vans, and nearby camping options.

Experience the final 70 miles of the Western States trail during this three day training event featuring supported runs of 19, 20, and 32 miles through iconic canyon terrain and mountain climbs.