Trail Running calendar near Lafayette 2026-2027

Run by the Sea at Wilder Ranch State Park on October 4, 2026 offers a Half Marathon, 12K and 4K run/walk along mostly flat packed dirt trails with coastal bluff and Monterey Bay views. Organized by the Santa Cruz Track Club; proceeds benefi..

Test your endurance at Lake Merced in San Francisco with a scenic 4.5 mile loop course. Choose between a standard run or tackle ultra marathon distances including the 50K and 50 mile events.

A trail race at Almaden Quicksilver County Park with distances from 5K to 50K. Courses are out-and-back, marked with colored ribbons, include aid stations and toilets, and the longer races reach Bald Mountain and Mt. Umunhum.

A 12.4 mile loop up to the Mount Diablo summit and back with about 4,000 feet of climbing and descending. The race starts and finishes at Mitchell Canyon and includes shuttle service, a post race raffle and a finisher item.

Trail races around the San Pablo and Briones Reservoirs in the East Bay offering 35K, half marathon, 10K and 5K on single track and fire roads. Aid stations, limited field size, parking at the visitors center, and volunteer support.

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.

A multi-distance trail event at Lake Sonoma featuring 100 mile, 50 mile, marathon and 4-person relays, with extensive singletrack, lake views, on-site camping, designated aid stations, and crew access at several points.

A trail running event in Walnut Creek on October 17, 2026, offering 30K, half marathon, 10K, 5K and a remote option; courses include some hills and walkers are welcome.

A 5k cross country race run in two loops around Willow Hill Reservoir next to Folsom High School, part of the Pacific Association USATF Cross Country Grand Prix, with a $75 bonus for breaking an age group record.

Trail races in Almaden Quicksilver County Park near San Jose include a Half Marathon, a 10K and a free one-mile kids race, with routes on single-track trails and fire roads through historic mining terrain and oak woodlands.

A themed charity run and community festival on October 18, 2026 in Downtown Roseville, CA, supporting the bleeding disorders community. The day includes a timed 5K, a one mile walk, festival food, carnival games, and a remembrance ceremony.

A backyard ultra at Beals Point in Granite Bay where runners run a 4.16 mile loop each hour until one remains. A 12 hour Mini format offers the same hourly lap with a fixed limit.

Trail race at Bothe Napa Valley State Park on October 24, 2026 offering marathon, half marathon, 10K and 5K. The course runs on narrow trails with streams and hills and the field is limited to 300 participants.

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 focused trail half marathon in the Marin Headlands covering 13.6 miles with 2,156 feet of climbing, coastal ridgelines and views of the Pacific and Golden Gate Bridge. The event offers training plans, shuttles, childcare grants and..

The 28th Matt Yeo Memorial Aggie XC Open is a cross country meet at Radke Martinez Regional Shoreline on October 24 2026 featuring three races over a returned course shortened to 4.1 miles with grass, dirt, and path surfaces.

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.

A trail event at Huddart Park in Woodside on November 7, 2026 featuring multiple distances including a six hour loop challenge, a kids dash for ages six to twelve, and a virtual run option.