California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 400 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 3 miles open race on the Sunset Conference cross country course at Huntington Beach Central Park on October 3, 2026, featuring electronic timing and age group medals.
21st Annual Garin Park XC Challenge at Garin Regional Park is a USATF Pacific Association cross country meet with about 5K courses featuring hills, scenic views, and a half mile flat finish.
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.
Experience the scenic beauty of South Lake Tahoe with trail races ranging from a 5K to a half marathon featuring views of Fallen Leaf Lake and Tahoe Mountain.
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.
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.
Trail running festival in Big Bear Lake, California, 8 to 11 October 2026 with two days of races across five distances 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.
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 near Silverado, CA offering 50 mile, 50 km, and 30 km courses on remote, rugged forest roads with well stocked aid stations and mandatory self support.
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.
Experience a 12.4 mile loop to the summit of Mount Diablo featuring 4,000 feet of elevation gain and a steep descent through scenic California trails.
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.
A self-sufficient fatass style run in Foresthill featuring up to 20,000 feet of climbing, bushwhacking, and route-finding along the American River.
Trail races of 10 mile, 10K and 5K wind through Gonzales Canyon with a flat start and finish at Solana Ranch Park on October 10, 2026.
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..