California
California Trail Running Calendar 2026-2027
Explore the best trail runs in California for 2026-2027! Our updated list features 387 exciting trail runs across the region. Find your next trail run in California below and join the trail community at these great events!
December 2026
Trail running at Sycamore Canyon with marathon, half marathon, 10K and hill climb options, notable elevation gains, required self-sufficiency, and costume prizes.
New Year's Eve at Lake Chabot in Castro Valley offers trail races on December 31, 2026, with a half marathon, 10K and 5K; walkers and hikers are welcome and free photos are provided.
January 2027
Multi-distance trail races at Lake Chabot across New Year's Eve and New Year's Day, including 5K, 10K, a half marathon and a virtual option.
New Year 5K and 10K run and walk starting at Chicago Park School in Grass Valley, with proceeds supporting local community organizations.
Kickstart the new year with a trail run at Overlook Park featuring 5K, 10K, and 10 mile distances along with collectible medals showcasing the history of Auburn.
A New Year event at Granite Beach featuring a 2 mile run 5 mile bike 2 mile run duathlon and a 5K trail run with lake views. Awards include overall champions and age group prizes.
Trail races in Malibu on January 2, 2027 with distances from 5K to 50K; registration closed August 31, 2026.
Trail races on Catalina Island featuring a 50 Mile and a 50K course that start and finish in Avalon. Organized by the Avalon Lions Club to raise funds for island charities and schools, with ocean views and possible bison sightings.
Trail event near Escondido offering a 50 mile ultra, marathon and relay, half marathon, summit 10 mile, valley 5 mile, stroller 5K, and youth 1 mile.
Community 5K run and walk at East La Loma Park Modesto on January 9 2027 with proceeds benefiting Sole Support; registration opens March 1 2026 and closes November 1 2026.
Scenic trail races at Granite Beach with 5K and 12K courses, local craft beer for those over 21, post-race food, commemorative gear and age-group awards.
Trail races in Auburn, CA on January 9, 2027 offering 50K, 35K, half marathon, and 8K over technical dirt trails with significant elevation gain.
Multiple trail races on 01/17/2027 at Huddart Park, from a 50 yard kids dash to 50K, set among redwoods, ferns and trails at King's Mountain and Bear Gulch.
A weekend of Spartan obstacle races at Lake Perris with 5K, 10K, 21K and kids races on a flat, scenic course near Perris, California.
La Cuesta Ranch Trail Run takes place in San Luis Obispo on January 23, 2027 and offers 10 km, 20 km and 30 km trail distances as part of the AllWeDoIsRun event calendar.
Trail running weekend in San Francisco that crosses the Golden Gate Bridge and runs through the Marin Headlands, with multiple race distances and spectator access.
Trail races from a Kids Run to 50K on mostly single track beside Folsom Lake, with multiple aid stations, toilets on course, and a nine hour overall limit.
Trail 10K and 5K at Granite Beach, Folsom Lake with aid stations, finisher medals, pre-order shirts, age-group awards, and a no-refund policy with limited transfers.