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!
September 2026
A point-to-point half marathon at Twin Lakes near Bridgeport, CA, featuring mountain elevations, three aid stations, shuttle service, and proceeds benefiting Bridgeport Elementary School.
Trail race in Simi Valley on Sept 26, 2026 offering 50K, 30K and 15K courses through Rocky Peak, Las Lljas and Tapo Canyon.
Community-supported Belmont Water Dog Run in Belmont, CA features 5K, 10K, kids' mile, a pet-friendly Fido Mile, and a virtual option on September 26, 2026.
Trail marathon, half and 5 mile along Old Coast Road at Andrew Molera State Park with aid stations, participant shirts and a 300 runner 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.
Double Peak Challenge in San Marcos on September 26, 2026 offers 10K, 5K and a free Kids Trot plus a race expo and awards.
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.
A trail event at Vandenberg Space Force Base on September 26, 2026 offering 10 km and 20 km distances. Non-base participants must show a REAL ID for base entry and all finishers receive a medal and a drink ticket.
Trail running in shaded redwood forest at Sanborn County Park on September 27 2026, with 10K, half marathon and 50K options; steep singletrack, shuttle parking, chip timing and specific mandatory gear for the 50K.
A themed run in Long Beach on September 27 with Half Marathon, 10K, 5K, a family mile and kids dash, ocean views, chip timing and a pizza themed finish line festival.
Trail event in Auburn, CA on September 27, 2026 featuring a half marathon, 12K and 5K with sections on the Western States Trail.
October 2026
A self guided 50K on the original South Yuba Campground to Bear Valley course in Nevada City, completed anytime during October with results submitted afterward.
Back On The Ranch Trail Run in Los Olivos CA runs October 2 to 4, 2026 and offers timed trail formats from three hours to 48 hours. The event is organized by AllWeDoIsRun, a promoter of California Central Coast trail events.
THE MAMMOTH on October 2, 2026 in Mammoth Lakes CA is a loop footrace around a volcanic caldera with alpine lakes, volcanic terrain and a Mammoth Mountain summit at 11,053 feet.
Multi-day event at McNear’s Beach Park in San Rafael featuring an Olympic triathlon, relay, a kids triathlon, a trail half marathon, 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 run through the San Gabriel backcountry, held since 1986; the 2026 edition uses an out and back course from Loma Alta Park.
Cuyamaca 100k is a 100 kilometer trail race in San Diego on Oct 3, 2026, crossing oak woodlands, meadows, pine forest and chaparral. The 2026 event is a Western States 2027 qualifier and supports outdoor education and public lands causes.
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.
Experience a trail half marathon on San Bruno Mountain featuring 2,400 feet of elevation gain and stunning views. Enjoy a scenic route with 93 percent trail coverage followed by a post race meal and finishers medal.