Trail Running calendar near Brentwood 2026-2027

Experience an obstacle course weekend at Woodward Reservoir Regional Park near San Jose. Choose from distances ranging from a 5k Sprint to a 50k Ultra on a flat course designed for personal performance.

Experience a scenic trail run through the Marin Headlands with panoramic views of the Golden Gate Bridge and Pacific Ocean. Choose between 10K, half marathon, and marathon distances on a course featuring wildflower lined trails.

Experience the scenic beauty of Mount Diablo with trail races ranging from 5K to 50K. Support local land preservation while enjoying a professional event featuring a post race BBQ in Walnut Creek.

Experience one of the largest 50 mile endurance runs in the United States. Choose between 10, 25, or 50 mile distances through scenic Northern California finishing with celebratory festivities in Auburn.

The Sludge Trudge 5K is a paved run/walk at North Natomas Regional Park. It's a sanctioned event with professional timing and awards for top finishers. The event is hosted for a specific community group and their guests.

Experience a scenic trail run around Angel Island with panoramic views of the Golden Gate Bridge and San Francisco. This event features a hilly loop course for both Half Marathon and 10K distances with ferry transport included.

Trail races at Lake Chabot Regional Park in Castro Valley range from a 50 yard kids dash to a 50K ultradistance. The routes circle the reservoir and surrounding hills and distances were measured with a Rolatape surveyor's wheel.

A women focused 10K in Auburn on April 11, 2026 featuring scenic trail loops, finisher shirts, age group awards and a raffle with four winners earning a trip to a women only running camp in Spain.

Explore the rolling hills of Cronan Ranch at the Magnolia Magic River Trail Run. This event offers a range of distances on dirt and rock trails, from a 5K to a 50K ultra. All participants receive a medal and access to aid stations along the..

Experience a scenic trail run along the San Francisco coast with views of the Golden Gate and Pacific Ocean. This five kilometer event awards ribbons to all finishers and top category performers.

On April 18, 2026 Outlands offers 25K, 50K and 50 mile trail courses near Pilot Hill, CA along Folsom Lake with runnable singletrack, steady climbs and stocked aid stations.

Experience the hills of Del Valle Regional Park in Livermore with a flat 5K or hilly 10K and half marathon. All participants receive a custom medal and t-shirt with professional chip timing included for all distances.

Experience the coastal beauty of the Bay Area Ridge Trail with distances ranging from a 50 yard dash to a 50K ultramarathon. Runners enjoy expansive views of the Pacific Ocean and the Santa Cruz Mountains.

Run through the beautiful trails of Trione Annadel State Park in Santa Rosa. This eco friendly event offers a half marathon, 10K, and 5K to support local park conservation and stewardship.

Experience a technical trail race through the scenic parks of San Carlos. Choose from four distances including a 15K long course and a dedicated kids run to support local trail maintenance.

Trail races in Huddart County Park and Purisima Creek Redwoods on April 18, 2026 offering 10K, half, 35K and 50K across technical single-track and fire roads, with chip timing, cupless aid stations, and significant elevation gain.

Trail races in the Sierra Azul Open Space Preserve near Mt. Umunhum, offering distances from 5K to 50K on out and back routes. Courses are marked with pink ribbons and supported by staffed aid stations with drop bag service for longer event..

Join the community at Feeney Park for the Mr Frogs Wild Run in Murphys California. Choose between a children's fun run plus five or ten kilometer courses featuring scenic neighborhood loops and a festive medal ceremony.

The Presidio Community YMCA hosts the 14th annual Presidio Trail Run on April 19, 2026, with 10K, 5K and 1.5 mile courses through the Presidio. Entry fees support YMCA community programs and a signed waiver is required.

A multi distance trail event in Auburn California from 23 to 26 April 2026 following sections of the Western States Trail. Distances include 161 km, 100 km, 50 km and 25 km and the 100 km awards Western States Golden Tickets.