California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 380 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 include a 13.1 miles half marathon, a 10K and a 5K with mixed terrain, aid stations and views along Deer Creek. Organized by Sierra TrailBlazers and Bear Yuba Land Trust.
Point to point trail races on the Bizz Johnson Trail in Lassen National Forest featuring a USATF certified Boston qualifier marathon, a 50K, an Express half and a 10K with remote starts and aid stations.
Trail cross-country races at China Camp State Park over an approximately 4.25 mile course, part of the PA-USATF series with limited on-site parking.
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.
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.
Ultrarunning on a 2 mile loop at Cahuilla Indian Reservation in Anza with multiple race formats, camping, aid stations, and fundraising for tribal youth programs.
Trail running in Cool, California with 5k, 10k and half marathon options on Sierra Foothills trails. Proceeds support Georgetown Divide Ready by 21 and a Camp Taylor scholarship; family packages, childcare, and a post-race breakfast are included.
Experience a diverse weekend of trail running and off road duathlon at San Diego’s Scenic Lake Hodges. Choose from distances ranging from a kid’s mile to a 50K ultra marathon or tackle the mountain bike and run challenge.
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.
Experience the Sierra foothills at the Springville Apple Run featuring trail routes and dirt roads. Choose between 10K and 5K runs or a 2 mile walk as part of the local Apple Festival.
Trail running event at Whiskeytown with 9 mile, 20.5 mile and 52K courses on singletrack and dirt roads; proceeds support trail maintenance.
Multi distance trail running at Lake Sonoma offering 100 mile, 50 mile, marathon and 4 person relays with singletrack, aid stations, drop bags and on site camping.
Run through the historic site of the 1848 gold discovery in California. This event features multiple trail distances from a 5K to a Half Marathon on scenic singletrack paths along the American River.
Trail loops through Alabama Hills with a half marathon and 10K, chip timing, aid stations, and fundraising for the John Wayne Cancer Foundation.
Trail races on Mount Diablo near Walnut Creek on October 17, 2026 offering 30K, Half Marathon, 10K and 5K 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.
A 5k cross country race run in two loops around Willow Hill Reservoir next to Folsom High School, part of the Pacific Association USATF Cross Country Grand Prix, with a $75 bonus for breaking an age group record.
Trail races at Almaden Quicksilver County Park include a half marathon, 10K and a kids one mile fun run with course aid stations and volunteer support.
A community 5K through Sequoia Park’s redwoods where runners may bring their dogs; proceeds support Sequoia Humane Society and there will be adoption opportunities.
Trail races in Upper Bidwell Park featuring a 13.1 mile half marathon and a 4 mile hourly endurance challenge with creek crossings, single track trails, aid stations, bag check, bike valet, and reusable cup provision.