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
A two day trail race weekend in Big Bear Lake with five distances from 10.5 km to 161.4 km, varied climates, festival activities, and UTMB World Series Major status.
Trail races in Auburn, California along the American River Canyon rim with live music and free cider. Distances include a 50K, a half marathon and a 5 mile course with aid stations on the longer routes.
Endurance races on a 4.5 mile loop around Lake Merced in San Francisco on 10/10/2026, featuring 50K, 50 mile, and a 4.5 mile Coastal Testing race.
Trail races in Silverado offering 50 miles, 50 km and 30 km on rough, remote forest roads with significant elevation gain and supported aid stations.
Granite Head Trails & Ales Trail Races feature 6.6-mile and 11.2-mile courses. Runners get a tech T-shirt and can enjoy post-race fajitas and a beer. The event is the final race in a local trail running series.
A 12.4 mile loop from Mitchell Canyon to the Mount Diablo summit and back, with about 4,000 feet of elevation change, a 5 hour cutoff, and shuttle service.
Trail runs of 5K, 10K, half marathon and 35K around San Pablo Reservoir with chip timing, marked trails, cupless aid stations, and a 300 runner capacity.
October 10, 2026 in Foresthill CA a fatass trail event offers 25 and 50 mile courses with heavy climbing, off trail sections, and limited entry.
Trail race through Gonzales Canyon offering 10 Mile, 10K, and 5K routes on dirt trails and featuring the steep Puke Hill climb.
Annual mud run in San Bernardino with a 5K for individuals and teams and a 1K kids race on October 10, 2026.
Trail running and hiking at Chino Hills State Park with 5K and 10K options, entry items, age-group awards, and specified parking fees.
A community Breast Cancer Awareness 5K at Hart Park in Bakersfield on October 10, 2026, featuring a scenic park course and post-race food, music, sponsor booths, and giveaways. Registration includes a performance T-shirt, finisher medal, meal, and bi..
A stair-climbing event in Central Park, Santa Clarita on October 10, 2026 to raise awareness for rare diseases; registration fee $20 and donations accepted.
Orienteering at Rancho Cuyamaca State Park with beginner, intermediate, and advanced courses, two start locations, a 1:7500 map, and a two and a half hour time limit.
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.