Trail Running calendar near Scotts Valley 2026-2027

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.

Trail races at Sanborn County Park in the Santa Cruz Mountains offering 10K, half marathon, and 50K on soft singletrack through redwood forest with sustained climbs, flowy descents, and shuttle access from offsite parking.

Scenic coastal races at Wilder Ranch State Park on October 4, 2026. Options include a Half Marathon, a 12K, and a 4K run and walk along mostly flat packed dirt trails.

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 Halloween-themed running event at Hellyer County Park offering distances from a kid's 50 yd dash to a certified marathon, with costume prizes, aid stations every 2-4 miles, and cupless hydration policy.

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.

Mermaid Trail Run at Huddart Park in Woodside on November 7, 2026 features multiple trail distances, a timed 6 Hour challenge and a youth dash. The course is hilly, parking has a cash fee and a pancake breakfast follows the race.

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.

Trail navigation event in Santa Cruz where solo runners or teams use a custom map to find up to 20 checkpoints in 2 or 4 hour formats; a finish area offers refreshments and social time.

A Thanksgiving morning event in San Jose offering 5K, 10K, a USATF certified half marathon, age-group races and a free kids' 50-yard dash. The course is mostly asphalt, aid stations appear every 2 to 4 miles, and the event is cupless.

A multi-distance trail event at Quarry Lakes Regional Recreation Area in Fremont featuring 5K, 10K, youth races, and a USATF-certified half marathon along Alameda Creek Trail with crushed-rock surfaces, cupless aid stations, and awards for..

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 San Francisco on Sunday 6 December 2026. You can run between 50 and 50 miles.