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!
September 2026
Family friendly 5K on September 20, 2026 in San Francisco with a scenic 3.4 mile course, race t-shirts, post race festivities and age based awards.
Trail 5K at San Pedro Park with a hilly, technical first mile; a kids run and a members only picnic follow.
Multi-distance trail running festival in Mammoth Lakes featuring high‑altitude technical courses, marked aid stations, and sustainability-focused, cup-less race operations.
At U.S. Bank Tower participants climb 75 floors or take a self-guided urban hike to support Ketchum Downtown YMCA programs, then gather for a block party with music and food.
Obstacle course weekend at Lake Elsinore Raceway featuring Sprint 5K, Super 10K, kids races, and Hurricane Heat formats on September 26 to 27, 2026.
A chip timed 5K trail run and walk at Ascot Hills Park with city views, finisher shirt and medal, live results and community activities.
Historic Bay Area trail event offering 100K, 50 mile and marathon courses, all UTMB indexed with the 50 mile in the Pacific USATF Grand Prix.
Trail ultras at Mt. Wilson in the Angeles National Forest offering 25K and 50K routes on technical single track with significant elevation gain and fully stocked aid stations.
Run a scenic point to point half marathon from Twin Lakes through the rolling hills of Bridgeport to support the local elementary school.
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.