Trail Running calendar near Redwood City 2026-2027

Trail races of 5K, 10K, half marathon and 35K around San Pablo Reservoir on EBMUD trails, with chip timing, stocked aid stations, a cupless policy, and a 300-runner capacity.

Three cross-country races on October 11, 2026 at Miwok Meadows, China Camp State Park in San Rafael, CA, on a roughly 4.20 mile mostly single track course with a short paved section.

Trail races on Mount Diablo near Walnut Creek on October 17, 2026 offering 30K, Half Marathon, 10K and 5K with possible mud and creek crossings.

Trail races at Almaden Quicksilver County Park include a half marathon, 10K and a kids one mile fun run with course aid stations and volunteer support.

Coastal Half Moon Bay race day with half marathon, 10K, 5K, kids and virtual options supporting Senior Coastsiders.

Trail marathon, half, 10K and 5K at Bothe Napa Valley State Park on October 24, 2026, limited to 300 participants on marked single track routes.

Oakland Hills Trail Run features 10K, half marathon and 35K courses through Redwood Regional Park with technical trails, marked routes, aid stations and chip timing. The event is cupless and limited to 330 runners.

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 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 from 10K to 50K around Mt Tamalpais, held at Stinson Beach with technical trails, significant climb, cupless aid stations, and chip timing.

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.

A map-based 2- or 4-hour team scramble through Santa Cruz redwoods and meadows with timed checkpoints and on-site timing chips.

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.

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.