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
Run by the Sea at Wilder Ranch State Park on October 4, 2026 offers a Half Marathon, 12K and 4K run/walk along mostly flat packed dirt trails with coastal bluff and Monterey Bay views. Organized by the Santa Cruz Track Club; proceeds benefit local gr..
Trail races at Fallen Leaf Lake near South Lake Tahoe featuring a half marathon, 10K, 5K and a noncompetitive half mile for children, aid stations and recycled shirts.
A 5K on shaded eucalyptus horse trails at Ernie Howlett Park in Palos Verdes Peninsula on October 4, 2026. In person and virtual options are available, plus a fundraising route that waives the fee with at least $100 raised for Strides in Recovery.
Multiple race distances start and finish at Sam Lynn Ballpark in Bakersfield, featuring mixed terrain on paved and dirt trails and a notable climb on the half. Aid stations, race day services, post race refreshments and awards are provided.
Halloween themed 5k, 10k, 15k and half marathon at West Creek Park in Valencia on October 4 with looped courses, aid stations, medals and race day registration.
A multi-day trail running event in Big Bear Lake offering five distances, varied mountain terrain, and UTMB World Series Americas 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.
Test your endurance at Lake Merced in San Francisco with a scenic 4.5 mile loop course. Choose between a standard run or tackle ultra marathon distances including the 50K and 50 mile events.
Trail races in Cleveland National Forest offering 50 mile, 50K and 30K courses with significant elevation gain, staffed aid stations, drop bags, pacer rules and mandatory self sufficiency.
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 climbing and a five hour cutoff.
Trail races of 5K, 10K, half marathon and 35K around San Pablo Reservoir on EBMUD trails, with chip timing, stocked aid stations, a cupless policy, and a 300-runner capacity.
Limited-entry fatass style 25 and 50 mile trail run near Foresthill, CA, featuring extensive climbing, off trail navigation, and a shared drop bag location.
Trail race in Gonzales Canyon at Solana Ranch Park with 10 mile, 10K and 5K courses and a 300 runner field limit.
Annual mud run in San Bernardino with a 5K for individuals and teams and a 1K kids race on October 10, 2026.
Trail 5K and 10K at Chino Hills State Park on October 10, 2026. Registration runs April 6 to August 15 and includes race photos, a shirt and a finisher patch.
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 6.45 mile trail race in Annadel State Park organized by the Empire Runners Club, limited to 100 runners with staggered starts and awards for the top 13 finishers.
A trail race at Almaden Quicksilver County Park with distances from 5K to 50K. Courses are out-and-back, marked with colored ribbons, include aid stations and toilets, and the longer races reach Bald Mountain and Mt. Umunhum.