California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 386 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
Trail races in Nevada City on October 11, 2026 offering a half marathon, 10K and 5K over mixed terrain with proceeds supporting Mines to Pines trail development.
Multi-distance trail races on the historic Bizz Johnson route in Susanville featuring a net-downhill certified marathon, river canyon bridges, and two railroad tunnels.
PA-USATF cross-country races at China Camp State Park on Oct 11, 2026, with a roughly 4.25 mile rolling single track course and three race divisions.
Insomnia is a night trail race in the Sierra Nevada foothills offering 35K, 14K and 5K options. Courses are marked with reflective ribbons and headlamps are required; the 35K has a 5 hour 30 minute overall cutoff.
Group trail run meeting at Other Brother Beer Aptos in Aptos, CA, with after work routes in Nisene Marks State Park or Seacliff; bring a headlamp 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.
Charity trail event in Cool, CA offering 5k, 10k and a trail half marathon with proceeds supporting Georgetown Divide youth programs and Camp Taylor scholarships.
Trail festival at Piedras Pintadas Trailhead in San Diego offering races from a 1 mile kids run to a 50K, plus a Run Bike Run trail duathlon.
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.
Trail races at Lake Sonoma on October 17–18 2026 offering 100, 50, marathon, half and relay options with significant elevation and staffed aid stations.
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 races on 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.
Mountain trail event on October 17, 2026 offering 50K, marathon, and half marathon options that climb to Cuyamaca Peak on single track trails, with substantial elevation change and GPX course files available.
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.