Hacienda Hills Trail Run - Spring

The Calero Hills Trail Fest, held at Calero County Park in San Jose, CA, offers a variety of trail running distances including a marathon, 30K, half marathon, 10 miler, 10K, and 5K. The courses feature challenging ascents and descents through scenic old oak groves, single track trails, and dirt path..

The Skyline 50K Endurance Run, held annually in August at Lake Chabot Marina in Castro Valley, California, is one of the longest-running 50K races in the state and among the oldest in the U.S. The course features a large loop through the scenic East Bay Regional Parks, reaching Skyline Gate. Known f..

The Mount Madonna Challenge, held in Gilroy, California, is a historic trail running event featuring a half marathon, 10K, and 5K races. Known for its challenging elevation gains—2,828 feet for the half marathon, 1,532 feet for the 10K, and 843 feet for the 5K—the race courses offer a rigorous test..

The Almaden Hills Trail Run - Summer is a challenging trail running event held at Almaden Quicksilver Park in the scenic Almaden Valley, San Jose, California. The course features a mix of 60% dirt roads and 40% single-track trails, with significant elevation gains offering stunning views and country..

The Santa Cruz Trail Run, hosted by Inside Trail Racing, takes place at Henry Cowell Redwoods State Park in Felton, California. Scheduled for August 23, 2025, the event offers three distances: 10K, Half Marathon, and 30K, featuring challenging courses through giant redwoods, twisting single-track tr..

Run-De-Vous is an ultramarathon event held at Harvey Bear Ranch Park in San Martin, California. The race features multiple distance options including 100 miles, 100 kilometers, 50 miles, 50K, a marathon, and a 4-person 50-mile relay. The course is a fast 2-mile loop set against scenic hills and dist..