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!
September 2026
Trail races of 50K, 30K and 15K through Corriganville Park in Simi Valley on September 26, 2026 with multiple aid stations and a charity contribution.
A community-supported, student-powered running event in Belmont on September 26, 2026, offering 5K, 10K, kids' and Fido mile options plus a virtual run.
Trail marathon, half marathon and 5 Mile at Andrew Molera State Park on Old Coast Road, with coastal views, marked aid stations, and a 300 participant limit.
A community ultramarathon and hike at Skyline Wilderness Park in Napa, CA, featuring a 3.3-mile loop repeated up to ten times in an hourly format to raise funds for the Pheo Para Alliance.
A community race in San Marcos on September 26 2026 offering a 10K competitive race, a 5K fun run and a free kids trot plus an expo and race merchandise.
The Great Trail Race is a point to point event between Truckee and Tahoe City, California, on Saturday, September 26, 2026. Participants may choose gravel bike, mountain bike, or trail run and select either an Elite or Classic course.
Trail race at Vandenberg Space Force Base on September 26, 2026 offering 10 km and 20 km distances, REAL ID required for non-base entrants.
Trail races at Sanborn County Park on Sep 27, 2026 through shaded redwood forest with steep climbs and flowy singletrack.
A road and trail event in Auburn, California offering a Half Marathon, 12K, 5K and a virtual option with chip timing and finisher medals.
October 2026
Experience the original Yuba Gold 50K point to point course as a self guided hybrid event through the trails of Nevada City during the month of October.
Run as many 3.4 mile laps as possible at the private Sand Creek Ranch with timed trail events ranging from 3 to 48 hours including on site camping.
Experience a 200 mile loop through the Eastern Sierra featuring volcanic landscapes, alpine lakes, and summits of the 11,053 foot Mammoth Mountain.
A three day weekend at McNear’s Beach Park combining an Olympic distance triathlon, a trail half marathon, a kids fun event, and a combined challenge.
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 trail race in the San Gabriel backcountry, scheduled October 3, 2026, using a lottery for entry and an out and back course from Loma Alta Park.
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.
9.1 miles to the Mt San Antonio summit with 3,926 ft vertical gain on steep, exposed mountain trails; course capped at 500 entrants in Angeles National Forest.
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.