California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 391 exciting trail runs across the region. Find your next trail run in California below and join the trail community at these great events!
October 2026
An in-person trail run meeting at Other Brother Beer Aptos with routes in Nisene Marks State Park or Seacliff; attendees should bring headlamps and ID for beverages.
Ruff Run California on 10/17/2026 in Phelan, CA presents a 20 acre obstacle course for people and their dogs with over 20 obstacles, 4K and 1K options, and an after party with music, games and vendors.
Trail races in Cool, CA on October 17, 2026 featuring 5k, 10k and a half marathon with proceeds supporting Georgetown Divide Ready by 21 and Camp Taylor scholarships.
Lake Hodges Trail Festival on Oct 17 to 18 2026 at Piedras Pintadas Trailhead offers races from 1 mile to 50K plus a trail duathlon with run bike run stages.
Trail running at Vasquez Rocks Natural Park in Aqua Dulce, CA with 13.9 mile, 15K, 10K and 5K race options on October 17, 2026.
Community running and walking events in Springville, California, featuring dirt-road and trail courses and a short kids run during the Apple Festival.
Trail run in Whiskeytown National Recreation Area on October 17, 2026 offering 9 mile, 21 mile and 32.5 mile courses with aid stations; proceeds support trail maintenance.
Lake Sonoma trail races on October 17 and 18, 2026 featuring 100 mile, 50 mile, marathon, half marathon and relay options on singletrack around the lake.
Trail races inside Marshall Gold Discovery State Historic Park offering distances from a kids run to a half marathon across singletrack, fire road climbs, and stocked aid stations.
Chip timed half marathon and 10K through the Alabama Hills with Mt Whitney views, raising funds for the John Wayne Cancer Foundation on October 17, 2026.
Trail race at Mount Diablo in Walnut Creek on October 17, 2026 offering 30K, half marathon, 10K and 5K on hilly trails with possible mud and creek crossings.
October trail race to Cuyamaca Peak offering 50K, marathon, and half marathon courses with significant climbing, aid stations, GPX files, and checkpoint cutoffs.
An annual 5k cross-country race at Willow Hill Reservoir in Folsom, CA, run as two loops of rolling hills with separate women's and men's categories and age-group records.
Trail races at Almaden Quicksilver County Park offering a half marathon, 10K and kids 1 mile with historic mining views and local conservation support.
Charity 5K at Sequoia Park in Eureka on October 17, 2026 where runners may bring dogs, run among redwoods, and support the Sequoia Humane Society.
A Halloween themed 5K around Lake Palmdale with costumes encouraged, aid stations, medals for all finishers, cash prizes for the top three, and costume awards.
Free social trail run on October 17, 2026 in Newport Coast with an approximately 6.5 mile hilly route plus post-run snacks and a raffle.
Glenn Bass Run in Sonora features a 5K and 1 mile on the Wildcat Ranch cross country course with rolling hills; proceeds support Sonora High cross country.
Trail races in Upper Bidwell Park offering a half marathon and two 4 mile options, including an hourly eight-loop endurance challenge with aid stations and on-course support.