Trail Running Calendar California 2026-2027

A multi-distance trail event at Quarry Lakes Regional Recreation Area in Fremont featuring 5K, 10K, youth races, and a USATF-certified half marathon along Alameda Creek Trail with crushed-rock surfaces, cupless aid stations, and awards for..

A 28k trail run in Fremont Canyon at Irvine Regional Park featuring about 3800 feet of elevation change and four aid stations. The course runs on fire roads, is cupless, and participants are asked to carry personal hydration.

Join the festive Krampus Cross Country in San Francisco with live and virtual options Dec 4 to 7 and the in person race on Dec 6. Pick 5K, 10K or the Naughty Nine Miler and take home a woodallion, tee and beer sampler stein.

The Hunter S. Thompson Fear & Loathing will take place in San Francisco on Sunday 6 December 2026. You can run between 50 and 50 miles.

Season finale at Crystal Cove State Park featuring 15k, 6k and Kids 1k trail races on coastal ridgelines and single track, a $2,000 15k prize purse, race shirts, finisher medals, free photography and post-race food and beer garden.

Trail running event in San Diego on Dec 20, 2026 offering marathon, half marathon, 10K and a six hour hill climb that uses repeated 2.5 mile up and down laps. The event includes a costume contest with solo and team awards.

A multi distance trail event in San Pasqual Valley near Escondido, CA offering races from a kids 1 mile to a 50 mile ultra. Finishers receive a shirt, medal and reusable cup and aid stations provide on course nutrition.

Take on the 68 mile Backbone Trail in the Santa Monica Mountains on January 16, 2027, with 13,600 feet of climbing and epic coastal views. Field capped at 200; solo entries require a prior 50 mile finish, relays of two to four welcome.