Trail Running calendar near Fairfield 2026-2027

A women's trail half marathon in the Marin Headlands on October 24, 2026 featuring a new 13.6 mile course, 2,156 feet of climbing and coastal views of the Pacific and Golden Gate Bridge.

A cross-country meet at Radke Martinez Regional Shoreline on October 24, 2026 with three 4.1 mi races over grass, dirt, and path terrain.

An October fundraiser offering a global virtual challenge plus an in-person event at San Francisco’s Ferry Building. Multiple distances from 5K to 50K are available; some courses are unmarked and maps are provided. Proceeds support the Brea..

Celebrate Halloween with a trail race through San Jose Hellyer County Park. Choose from distances including 5K 10K Half Marathon and Marathon with costume prizes and certified courses.

Trail races in Almaden Quicksilver Park from 5K to 50K over hilly dirt roads and single-track, with two staffed aid stations, drop-bag service for longer distances, and a finisher medal for all participants.

Support student programs and the Oakland Tech Cross Country team at Joaquin Miller Park. Choose between a five kilometer trail race or a one mile fun run through the redwood trees.

Trail races at Beal's Point near Folsom Lake offering a 100 mile and a 50K course with major elevation, stocked aid stations, drop bag and pacer rules.

Trail runs at Huddart Park on November 7, 2026 with 3, 6, 9 mile and half marathon options, a 6 Hour loop challenge, kids dash and virtual race.

Experience a scenic trail run around the Lake Chabot reservoir and hills. With distances from a 50 yard kids dash to a 50K ultramarathon there is an option for everyone at this Castro Valley event.

Trail races in Stinson Beach on November 7, 2026 with 10K, half marathon, 30K and 50K that climb Mt. Tam and return to the beach. Aid stations provide food and hydration and the event is limited to 500 runners.

Experience a flat and fast trail race through the scenic Quarry Lakes Regional Recreation Area in Fremont. Choose from a USATF certified half marathon, 10K, or 5K while enjoying views along the Alameda Creek Trail.

The Falcon Crest Winter Trail Challenge will take place in El Dorado Hills on Saturday 14 November 2026. You can run between 5 and 42 kilometers.

Trail races on the Stanislaus River Trail in Ripon, CA offering 5K, 10K and a half marathon with shirts, medals and age-group awards on November 14, 2026.

Trail race at Darrington Trail Head by Folsom Lake offering 5K, 10K, 18M and 36M on rocky single-track with rolling hills, aid stations, drop bags, and a 10-hour overall time limit.

Timed running events at Jacob Myers Community Park on November 21, 2026 let runners see how many miles they can complete in set durations. Options include two, four, six and eight hour races on a loop just under one mile.

Celebrate Thanksgiving at Hellyer County Park with a trail race along Coyote Creek. Choose from a USATF certified half marathon, 10K, or 5K while competing for a chance to win a turkey.

Thanksgiving Day 5K and 10K plus a short Little Turkeys kids race at Point Pinole Regional Shoreline Park with a food drive and virtual options.

A Thanksgiving Day 5K and 1 mile event at San Leandro Marina with canicross teams, kids races, and proceeds benefiting animal welfare; the course is flat with mixed surfaces and free parking is available.

A Thanksgiving Day trail event at Beals Point offering 5k and 10k courses plus a free 1k kids run for under-6s. The race supports Folsom's Hope, features one aid station, and requires runners to bring a cup or bottle.

The San Francisco Turkey Trot will take place in Lincoln Park-Lobos on Thursday 26 November 2026. You can run between 3 and 5 miles.