Trail Running calendar near Clayton 2026-2027

Peacock Gap Trail Run at China Camp State Park on December 5, 2026 offers 10K, half and 30K trail courses with marked single track and fire roads, chip timing, aid stations, and a cupless water policy.

An urban single-loop ultra from Twin Peaks in San Francisco offering 50K and 50 mile options, informal aid from volunteers, a mile 25 cutoff for the 50 mile, and support for the Shoes For Runners charity.

Trail races through redwood groves at Sanborn Regional Park with a half marathon, 10K and 5K. Routes use single track trails and chip timing, and walkers and hikers are welcome.

A point to point half marathon on the Southside Trail at Folsom Lake featuring mostly single track, an overall ascent of 1,683 ft, multiple aid stations and a 4.5 hour time limit, starting at Salmon Falls and finishing at Brown’s Ravine.

A multi-distance trail race at Magnolia Ranch Trailhead in Pilot Hill, CA on December 12, 2026, organized by Troy's California Trail Runs, featuring stony dirt paths, hill sections, and lake views with options from a kids run to a 50K.

A loop course around Angel Island with panoramic San Francisco views. Options include a half marathon of two laps and a single loop 10K, limited to 400 participants and with ferry fees included in race pricing.

Forest and ridge single-track runs in Woodside, California with 10K, half, 35K and 50K options, chip timing, aid stations, and cupless hydration requirements.

Trail races at Lake Chabot in Castro Valley on December 31, 2026 include a half marathon, a 10K and a 5K. Hikers and walkers are welcome and runners can repeat the course on January 1 to earn the mega medal or combine both halves for a full..

A New Year's Day running event at Lake Chabot in Castro Valley offering 5K, 10K and a half marathon. The half marathon is part of the Brazen Ultra Half Series and the event includes bib pickup, free photos, results and volunteer options.

A winter trail event at Almaden Quicksilver County Park offering distances from a kids run to a 50K, marked dirt-road courses, aid stations with toilets, drop-bag service for longer races, and measurable elevation gain.

Join a community run and walk along the scenic trails of the Tuolumne River Regional Parkway in Modesto. Support the Sole Support Sponsorship Program while completing a 5K course alongside friends and family.

Two scenic trail races along Folsom Lake on January 9, 2027, offering a 12K and 5K on single-track trails, post-race local beer for athletes over 21, commemorative items, hot food and age-group awards.

A trail race in Huddart Park near Woodside CA on January 17, 2027 offering distances from an 8K to a 50K plus a free kids 50 yard dash. Courses run through redwoods, are well marked, and feature stocked aid stations.

Run through the towering redwoods and lush ferns of Huddart Park in Woodside. This trail event offers multiple distances from a five mile race to a 50K ultramarathon plus a free dash for children.

Experience the magic of the Golden Gate Bridge and the Marin Headlands. This Spartan Trail event offers distances from 15k to 50 miles with panoramic mountain and sea views.

Trail races on single-track trails around Folsom Lake with distances from a kids run to 50K, marked routes and staffed aid stations; parking is paid and dogs are not allowed on course.

Trail 5K and 10K runs along the shores of Folsom Lake on a well marked trail with aid stations, volunteer support, returning finisher medals, and pre order shirts available.

Experience scenic bay views and varied terrain at Coyote Hills Regional Park with half marathon, 10K, and 5K distances. Enjoy a mix of dirt trails and boardwalks on courses designed with minimal climbing.

Experience the coastal beauty of the Marin Headlands at the Golden Gate Trail Run. Choose from distances ranging from a 50K trail race to a fun kids dash with views of the Golden Gate Bridge and San Francisco.

Mt. Umunhum Trail Conquest (Winter) is a multi-distance trail event at Almaden Quicksilver County Park offering races from a kids run to a 50K with marked out-and-back courses, multiple aid stations, and summit sections to Bald Mountain or..