Trail Running calendar near Windsor 2026-2027

Trail races on Mt. Tam near Stinson Beach offering 10K, half marathon, and 30K courses with steep climbs, technical single-track, cupless aid stations, chip timing, and a 300-runner capacity.

Trail races at Rodeo Beach in the Marin Headlands offering 8K, half marathon, 30K and 50K on coastal singletrack and fire roads; chip timed, cupless, capacity 350.

One of America's oldest 50k races, the Skyline Endurance Run is a scenic August loop starting at Lake Chabot Marina. Known for strong community support and aid stations, it finishes with a plant-based BBQ. The event also features a half mar..

Bear Creek 2026 offers a hilly half marathon, 10K, and 5K on August 8 in Lafayette, CA. The scenic trail course features beautiful views and a rewarding downhill finish. All finishers get a custom medal and shirt, and walkers are welcome.

A single loop 50K ultramarathon in Muir Beach, California on Saturday, August 15, 2026. The course uses notable Marin trails, includes about 6500 feet of elevation gain, and features coastal and Bay Area views.

An orienteering style 5K and 10K in San Francisco where solo runners or teams of up to five use a custom map to visit up to 30 checkpoints, answer simple multiple choice questions, and enjoy refreshments at the finish.

Tackle the legendary Double Dipsea, a 13.7-mile out-and-back on the historic Dipsea Trail from Stinson Beach. This unique race features a handicapped start, putting all runners on a single-track course of constant passing. Experience the hi..

Diablo Trail Run on September 6, 2026 in Clayton CA offers distances from a 4 mile Mitchell Canyon course to a 50K, plus a free kids 50 yard dash for age six and younger. Courses use dirt roads and single track with aid stations every 3 to..

A weekend running festival set in Mendocino Woodlands Park with 12 hour and 6 hour timed events plus 10K and half marathon on a six mile redwood loop. Weekend camping, food passes, live music, and camp facilities are included.

Trail races on September 12, 2026 in Tilden Regional Park and Wildcat Canyon offering 50K, 35K, half marathon and 10K courses with marked trails, aid stations every five to seven miles, and a cupless format requiring reusable cups or bottle..

The Rocky Ridge 2026 offers a challenging half marathon trail run in the Las Trampas Wilderness, plus 10K and 5K options. It's the finale for the Ultra Half Marathon Series and supports the East Bay Regional Parks Campership Program. Partic..

The Dick Collins Firetrails offers three classic trail races in California's East Bay. Choose from a 100k, 50-mile, or marathon distance on historic trails around Lake Chabot. All finishers receive unique items, and the races are qualifiers..

Run the 39th Ruth Anderson Memorial Endurance Run on October 10, 2026 in San Francisco. Choose 100 km, 50 miles, or 50 km on a scenic paved loop around Lake Merced with chip timing and certified 50K and 50 mile courses.

A multi-distance trail running festival in Healdsburg during harvest, combining the Lake Sonoma 50 with a new 100 mile race, a trail marathon, and relay options on nearby trails.

A trail running event on Mount Diablo in Walnut Creek. Runners can choose from a 30K, half marathon, 10K, or 5K distance on scenic trails. Walkers are welcome, and conditions may include mud and creek crossings.

A trail fundraiser in Joaquin Miller Park offering a 5 km trail race and a 1 mile fun run/walk to support Oakland Tech PTSA and the school cross country program; donations are tax-deductible.

A multi-distance trail event around Lake Chabot in Castro Valley on November 7, 2026, offering 8K to 50K options plus a free kids' dash, marked trails, regular aid stations, and a cupless policy.

This November trail run takes on the iconic slopes of Mt. Tamalpais, starting at Stinson Beach. Runners can choose from four distances, from a 10K to a 50K ultramarathon, all featuring significant climbs and views. The event includes chip t..

A San Francisco trail event offering live and virtual options across three distances. Participants receive a handcrafted woodallion, a Krampus lifestyle tee, and a Krampus beer sampler stein, with pre race pickup and a BREWFEST.

The Hunter S. Thompson Fear & Loathing will take place in San Francisco on Sunday 6 December 2026. You can run between 50 and 50 miles.