Trail Running calendar near Duncans Mills 2026-2027

Live and virtual 5K, 10K and half marathon at Lake Chabot Regional Park in Castro Valley, June 26 to 29, 2026. Courses mix paved and trail sections with aid stations; live participants receive a shirt, handcrafted woodallion and beer sample..

The Bay 2 Bankers 10K will take place in Fort Mason on Saturday 4 July 2026. You can run between 5 and 10 kilometers.

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.

A long running 50K and half marathon around Lake Chabot Marina and East Bay parks each August, with community staffed aid stations, downloadable course guides, and post race plant based food.

Run among towering redwoods in Oakland on August 15 at the Redwood Summer Trail Run, with distances from a 5 mile to an epic 50K plus a free kids dash. Expect stocked aid stations, finish medals and classic trail vibes.

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.

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..

A multi distance trail event at Lake Chabot Regional Park in Castro Valley featuring a 100k, a 50 mile, and a marathon. All races are UTMB Index events and the 50 mile is part of the Pacific USATF Grand Prix.

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 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 race at Lake Chabot Regional Park on November 7, 2026, featuring 8K to 50K options and a free kids' 50 yard dash; marked loops, fully stocked aid stations every 4-5 miles, and cupless support.

Join the festive Krampus Cross Country in San Francisco with live and virtual options Dec 4 to 7 and the in person race on Dec 6. Pick 5K, 10K or the Naughty Nine Miler and take home a woodallion, tee and beer sampler stein.

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