Trail Running Calendar California 2025-2026

Join the VALENCIA Trail Race in Valencia California on March 21, 2026 for scenic, rugged single track and ridge runs with 10K, half marathon and 50K distances. Expect big climbs, friendly aid stations and a festive finish.

Run through towering redwoods in Oakland's Redwood Regional Park with distances from a kids 50 yard dash to a challenging 50K. Enjoy ribbon marked singletrack, stocked aid stations, custom finisher medals, and awards for top finishers.

Run the Lag Bon 10K on March 22 in Fairfax on a scenic, technical Lagunitas trail with roots, rocks and muddy sections. This small charity race supports World Water Day with proceeds to safe water programs and runners get a shirt and medal.

Run a fast, friendly 5K or 10K along wide, flat dirt trails in Del Mar with open lagoon views and a downhill finish. Scenic course may include glimpses of nesting osprey and serves as the final Sunshine Series Championship Qualifier.

Tackle scenic single track along the American River at Knickerbocker Canyon Trail Run near Auburn. Choose 35K, half marathon, 10K or 5K routes with river crossings, big climbs and rugged trail that rewards grit and views.

Push your limits at Bad Ass Backyard Ultra on Dry Creek Parkway in Rio Linda, California, running a 4.16 mile loop every hour until one runner remains. This affiliated backyard event combines fierce competition with a welcoming community an..

Run along the historic Western Pacific Trail at Quarry Lakes in Fremont on March 28, 2026, with 5K, 10K and half marathon options plus a remote runner category. Mostly flat dirt and gravel trails make for a scenic, friendly race for all pac..

Billy Goat Mountain Climb on April 4, 2026 in Silverado CA invites runners to tackle scenic, challenging climbs through Cleveland National Forest with a 10K, half marathon, or a 17 mile Silverado Loop with big elevation gain. Finish line sh..

Run with sweeping views of the Golden Gate Bridge, San Francisco Bay and Pacific Ocean on scenic trails in the Marin Headlands. Choose Marathon, Half Marathon or 10K on April 4, 2026 in a 400 runner field for an intimate coastal challenge.

Run under the full moon through Reedley farm country, weaving orchards, vineyards and oak shaded paths along the Kings River. Choose from 12K up to epic 100 mile and timed 6, 12 or 24 hour formats for a memorable night to day adventure.

Celebrate Easter with a trail run at Griffith Park in Los Angeles. Choose distances from 5k to a half marathon on scenic dirt paths with a grassy start and finish. Finisher medals, snacks and free photos add festive fun for all paces.

Run the classic American River Endurance Runs from Folsom to Auburn, featuring 50 mile, 25 mile and 10 mile trail races that finish at the Auburn Overlook. Scenic river corridor, on course support, and a festive post race atmosphere.

Join the Diablo Trails Challenge on April 4, 2026 at Mount Diablo with distances from 5K to 50K on scenic but demanding trails. A portion of entry fees benefits Save Mount Diablo and race day photos and a BBQ add to the experience.

Run the scenic Point Mugu Trail Run in Malibu with ocean view switchbacks and challenging climbs on the Fireline Trail. Choose a half marathon or 10k, enjoy a finisher medal, free breakfast tacos and a beer garden and a course record bonus.

Run or ride around scenic Diamond Valley Lake on April 11 and 12, 2026 with distances for all levels from youth mile to marathon and gravel rides. Enjoy single track trails, cupless aid stations, custom finisher shirts and handcrafted woode..

Run the 41st Nature Made Great Race in Agoura Hills on April 11, 2026 for scenic trail and road courses from a mostly trail half marathon to 5K and challenge distances. In person and virtual options, medals and a lively finish at Chumash Pa..

Run with the Burros is a Pack Burro Race and trail run in Inyokern, CA on April 11, 2026. Choose from marathon to 5 mile courses, race with or without a burro, and support local donkey rescue and a breakfast burrito charity.

Run Angel Island on a scenic hilly loop with sweeping Golden Gate, Alcatraz and Bay views. Choose a 10K or a half that circles the island twice at the 35th annual event limited to 400 runners, ferry included.

Oriflamme 50K on April 11, 2026 challenges runners with a scenic out and back from Sunrise Trailhead, dropping into Anza Borrego desert and climbing back on rugged single track. Field capped at 150 with a tech shirt and finisher medal.

Lake Sonoma race weekend in Geyserville on April 11, 2026 hosts a Western States qualifying 100K, a rolling 50K, and the Trail Sisters half for women. Expect scenic lake overlooks, lively aid stations, and campground vibes.