Trail Running calendar near Fairfield 2025-2026

Run scenic single track and fire roads around Auburn, including stretches of the historic Western States trail and the No Hands Bridge. Choose from 35K, half marathon, 10K or 5K distances, enjoy aid stations and a finisher medal for all.

Limited to 400 runners, the Golden Gate Headlands Marathon, Half Marathon and 10K invites trail lovers to Mill Valley, CA. Run single track trails and fire roads with sweeping views of the Golden Gate Bridge, San Francisco Bay and Pacific.

Run scenic singletrack on Mount Diablo with distances from 5K to 50K, including a longer than standard Brazen Ultra half marathon. Funds support Save Mount Diablo and postrace photos and results are provided.

Run the scenic American River Parkway from Folsom to Auburn with 50, 25 or 10 mile options. Expect aid stations, a tech shirt and finisher medallion, plus a festive post race party with food and a beer garden.

Romancing the Island at Angel Island State Park offers a scenic half marathon or 10K loop with iconic Bay views. Limited to 400 runners, this intimate island race is ferry accessible and unforgettable.

Run scenic trails at Lake Sonoma near Healdsburg with 100K, 50K or the Trail Sisters women only half marathon that finishes at the Visitor Center. Expect big climbs, lake overlooks, strong aid support and a celebratory finish.

Run around Lake Chabot's scenic reservoir and rolling hills on April 11, 2026, with distances from a kids dash to a 50K ultra. Pre registered runners get shirts, all finishers earn medals, and well stocked aid stations keep you moving.

Run the scenic Wild Flowers 10K in Auburn on April 11, a loop of single track trails with rolling hills and two aid stations. All finishers get a race tee and top finishers can win prizes including an all expenses paid trip to Spain.

Challenge scenic, technical trails above Calistoga with 50K, 35K, half marathon and 10K options, several UTMB index races. Big climbs, remote single track and a custom finisher medal and race shirt for every finisher.

Run lakeside single track around Folsom Lake at the Outlands Endurance Race in Pilot Hill CA on April 18, 2026. Choose 25K 50K or 50M out and back courses with stocked aid stations plus finisher swag and wood awards.

Join Badger Cove at Del Valle Regional Park on April 18 for a scenic half, 10K, 5K or remote run around Lake Del Valle. All finishers get custom medals and shirts, chip timing, and proceeds support East Bay Regional Parks camperships.

Hit the trails April 18, 2026 at Skyline Ridge Open Space Preserve in La Honda for the Horseshoe Lake Trail Run, with distances from 5 miles to 50K plus a free kids dash. Enjoy Pacific and Santa Cruz Mountain views, single track terrain, st..

Celebrate Earth Week with trail runs through Annadel State Park at Spring Lake Regional Park in Santa Rosa. This nonprofit fundraiser features half marathon, 10K and 5K distances, low waste aid stations, and supports local park stewardship.

Join the No Foolin' Foot Race in San Carlos on April 18, 2026 with 1K kids, 5K, 10K and a new 15K route across Big Canyon, Eaton and Pulgas Ridge. Festival vibes, tech shirts, pro timing and proceeds help local trails.

The Canyons Endurance Runs will take place in Auburn from Friday 24 April 2026 to Saturday 25 April 2026. You can run between 25 and 161 kilometers.

Join the 38th Mt Tam Wild Boar Half Marathon and 10K on April 25, 2026 at Mt Tamalpais State Park for a scenic ridge and trail run with sweeping views of Bolinas Lagoon and the Pacific. Entry is limited to 300 runners for an intimate race d..

Take on the Miwok 100K in the Marin Headlands near Stinson Beach, a scenic 62 mile trail with 11,000 feet of climbing. Limited to 400 runners, the well supported, low waste event offers relay and training options plus finisher swag.

Join Tails & Trails on May 3, 2026 in Windsor, CA for a charitable walk and run supporting Dogwood Animal Rescue. Choose a 5K, the family friendly Dogwood Dash, or participate virtually while helping animals in need.

Join Angwin to Angwish, a scenic trail run through Pacific Union College woods with 26K, 10K and a 1 Mile Kids Run for ages 7 to 12. Family friendly, cupless event with race day check in and proceeds benefiting PUC Athletics.

Experience towering redwoods and coastal views at the 36th Stinson Beach Muir Woods Trail Run on May 9, 2026. Choose marathon, half, or 7 mile routes in an intimate field of 300 for a scenic, rugged adventure with T shirts and medals.