Fourmidable

The Way Too Cool 50K & 10 Mile Endurance Runs is a celebrated trail running event taking place in Cool, California. This iconic race, now in its 35th year, features a challenging 50K course known for its scenic beauty, including rolling hills and creek crossings. A new addition is the 10-mile trail..

The Ruck a Chuck 50K is an exhilarating trail running event set in the stunning Sierra Nevada foothills of Foresthill, California. Participants will navigate a challenging out-and-back course that showcases the breathtaking beauty of the region, including sections of the historic Western States Trai..

The Folsom Lake Southside Trail Run is an exciting trail running event taking place in Folsom, California, featuring a variety of distances including 50K, Marathon, 25K, Half Marathon, 7.5 Miler, and 5K. The race predominantly follows a scenic single track trail that runs alongside Folsom Lake, offe..

The Knickerbocker Canyon Trail Run, scheduled for March 22, 2025, in Auburn, CA, offers a variety of race distances including 5K, 10K, Half Marathon, and 35K. Participants will traverse the historic Western States trail, featuring challenging climbs such as the K2 training hill and scenic views alon..

The Bad Ass Backyard Ultra, held at Dry Creek Parkway in Rio Linda, California, is a unique running event where participants complete 4.16-mile loops within one hour. Runners must be ready to start each new loop on the hour, and those who fail to do so are eliminated. Originally created in 2023 as a..

The Folsom Lake Falcon Crest Trail Run, scheduled for March 29, 2025, takes place in the scenic foothills of El Dorado Hills, California. Participants can choose from various distances, including a 5K, 10K, 8-mile, and half marathon, all featuring beautiful single-track trails alongside Folsom Lake...