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
Run by the Sea at Wilder Ranch State Park on October 4, 2026 features a half marathon, 12K and 4K on mostly flat coastal bluff trails.
Trail races in South Lake Tahoe on October 4, 2026 featuring half marathon, 10K, 5K and a youth Tadpole Trot with aid stations and finisher awards.
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 running at West Creek Park in Valencia with 5k, 10k, 15k and half marathon loop courses, aid stations, and custom finisher medals.
Off road 5K on San Bruno Mountain with about 300 ft elevation gain, starting and finishing at the picnic area and routing via Old Guadalupe Trail and Saddle Loop Trail.
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.