Trail Running Calendar California 2025-2026

The Western Pacific Marathon event, held at Quarry Lakes Regional Recreation Area in Fremont, California, offers runners a choice of half marathon, 10K, and 5K distances. The course is mostly flat, following the historic Western Pacific Trail, which was originally used in the 1800s to transport grav..

The Knickerbocker Canyon Trail Run takes place Saturday, March 28, 2026 at American River Overlook Park in Auburn, California. The event offers the following distances: 35K - 20.8 miles, 4,800 ft elevation gain Half Marathon - 13.3 miles, 3,000 ft elevation gain 10K - 6.1 miles, 1,150 ft elevation..

Coast to Crest is an annual trail race in Del Mar, California, held on March 28, 2026 at the San Andreas Staging Lot, 2801 Via De La Valle. The event offers two distances: 10K 5K The 10K and 5K serve as the final Championship Qualifier of the Sunshine Series. Strava route maps are available for b..

The Silver Moon Race at Kings River takes place in Reedley, California, offering 12K, and 6-, 12-, 24-hour, or 100-mile options on a scenic lap course. Runners complete a 2-mile or 2.5-mile loop through farms, vineyards, oak canopies, and along the Kings River in Central California, with an atmosphe..

Hoppy Easter in Griffith Park, Los Angeles, is an open-course running festival organized by ABetterWorldRunning. The event offers 5k, 10k, 15k, and a half marathon, all run on a dirt trail within the park. The course is marked with cones and signs on a shared path, with pedestrians and equestrians s..

Set in the Marin Headlands, the Golden Gate Headlands Marathon, Half Marathon & 10K starts and finishes at the Historic Gunnery Range in Rodeo Valley, Mill Valley, California. The course traverses scenic single-track trails and fire roads, offering panoramic views of San Francisco Bay, the Golden Ga..

Diablo Trails Challenge is a trail-running event held at 1700 Castle Rock Road, Walnut Creek, CA, in support of Save Mount Diablo. The race offers multiple distances to suit all levels: 50K, half marathon, 10K, and 5K, plus a Remote Runner option. The course traverses Mount Diablo’s open-space trail..

American River Endurance Runs is a three-race ultra series from Folsom to Auburn, California, along the scenic American River Parkway. The flagship AR50 has become the second-largest 50-mile race in the United States, attracting veterans and newcomers, with companion 25- and 10-mile events finishing..

Billy Goat Mountain Climb takes place in Silverado, California, in the Cleveland National Forest, with the start/finish on Maple Springs Road near Lost Woman Canyon. The event offers three distances: the Silverado Loop at about 17 miles with roughly 3,800 feet of elevation gain; a half-marathon clim..

Oriflamme 50k is an out-and-back ultramarathon set in the Anza-Borrego Desert near Julian, California. The 50K starts at Sunrise Trailhead and follows the Pacific Crest Trail north to Mason Valley Truck Trail, then descends into Oriflamme Canyon, runs along the California Riding & Hiking Trail throu..

Taking place in Healdsburg, California, the TERREX Lake Sonoma weekend features three distances on April 11, 2026: the Lake Sonoma 50 Mile, the Lake Sonoma Marathon, and the Trail Sisters Half Marathon. The event blends competitive racing with a festival atmosphere, including an Elite division in th..

Bedrock Valley Trail Runs is a family-friendly trail weekend held at Diamond Valley Lake Marina, Hemet, California. The festival offers multiple trail distances: Trail Marathon, Trail Half Marathon, 15K, 10K, 5K, a Stroller Trail 5K, and a 1-Mile Kids’ Fun Run, plus an Elevated Youth 1M. A Gravel Ro..

Romancing the Island Half Marathon & 10K takes place at Angel Island State Park, Belvedere Tiburon, California. The course is a hilly loop around the island: the half marathon runs the loop twice, the 10K once. Runners enjoy panoramic views of the Golden Gate Bridge, San Francisco, Alcatraz, the Eas..

The Nature Made Great Race takes place on Saturday, April 11, 2026, in Agoura Hills, CA, with the finish at Chumash Park (5550 Medea Valley Dr). The event includes multiple race options on both trail and road; the Chesebro Half Marathon is described as mostly trail (about 8 miles of trail and 5 mil..

Run With The Burros is a unique pack burro race and trail run held annually on the second Saturday of April in Inyokern, California. The event offers four distances: 5, 10, 18, and 26.2 miles, with participants having the option to run with or without a donkey. The course features challenging terrai..

Location: Calistoga, California, in Napa Valley. Distances: 50k, 35k, half marathon, and 10k. Atmosphere: a mountain-style trail ultra with a devoted community feel, starting and finishing on the Great Lawn at the Calistoga Fairgrounds.Course: four races depart the Fairgrounds, venturing into Robert..

The Ramona Wine Country 5K is a unique running event held at BackCountry Gardens in Ramona, California. This scenic race features a challenging 1.5-mile loop course with natural obstacles including hills, streams, boulders, and mud, offering participants the option to complete one or two loops. Beyo..

The Outlands Endurance Race, held at Peninsula Campground in Pilot Hill, California, offers challenging trail running distances of 25K, 50K, and 50 miles. Set along the rugged, scenic edges of Folsom Lake, the courses feature a mix of runnable single track and double-wide trails with significant ele..

Badger Cove Half Marathon/10K/5K 2026 is held at Del Valle Regional Park in Delvalle, Livermore, California. The emerald hills of Lake Del Valle form the backdrop for three races: a half marathon, 10K, and a 5K, with a virtually hill-free 5K option when conditions permit. The event, hosted by Brazen..

ANNUAL NATRO@NOLI INDIAN SCHOOL is a multi-distance trail race on the Soboba Indian Reservation near San Jacinto, California. The event offers Marathon, Half Marathon, 5k, and Kids 3k in Native and Open divisions, with awards for top finishers. The course features hills, sand, rock, single-track, st..