California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 399 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 runs near Bear Valley and Lake Spaulding with a 50K and a 24 mile option. The 50K includes a summit loop with about 5,700 ft of gain, rocky sections on Signal Peak OHV Road, cupless aid stations, and finisher medals.
A 100-mile endurance run through the San Gabriel backcountry with an updated out-and-back course from Loma Alta Park, official training runs, and pre-race logistics the day before.
A 100 km trail race in Cuyamaca Rancho State Park through oak woodlands and pine forest, limited to 250 qualified entrants with live tracking and aid stations.
Cirque Series at Mt Baldy on 10/03/2026 is an inaugural trail race featuring a 9.1 miles course with 3,926 ft of vertical gain and separate competitive divisions.
Trail half marathon in Brisbane, California on October 3, 2026 with 2,400 ft elevation gain, summit views, aid stations and a cupless policy.
SEB Mud Run in Castaic on October 3, 2026 features a chip timed 4 mile mud obstacle and a 1 mile kids fun run with showers and changing tents on site.
Night trail race in the Yuha Desert near Ocotillo CA featuring 8 mile and 25K courses with a marked out and back route and two aid stations.
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.
Monthly community hike with an optional trail run in Richmond, CA, organized by FIERCE Advocates with Moving Forward and Richmond Run Club; free parking and open to all ages.
Gravelanza Los Angeles at Griffith Park on October 3, 2026 mixes gravel races and a festival hub with live music, food, team heats, and sustainable finishers medals.
Collegiate invitational at Santa Clarita Central Park on October 3, 2026, featuring men's 8 km and women's 6 km races with free registration.
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.