Terrible, Horrible, No Good, Very Bad Day 50K

The Quicksilver Endurance Runs is an annual trail running event held in San Jose, California, featuring 50K and 100K races on scenic, challenging single-track trails and fire roads through oak forests, meadows, and ridges with panoramic views of the Santa Clara Valley and Santa Cruz Mountains. The 1..

The 13 Mile Trail Race Top Down is a scenic trail running event held in San Jose, California, featuring a half marathon course through Almaden Quicksilver Park and Sierra Azul Open Space Preserve. Participants are transported from Almaden Quicksilver Park to the starting point at Mt. Umunhum, where..

Trailquake is a trail running event held in Sanborn Regional Park, Saratoga, California, featuring a half marathon, 10K, and 5K distances. Participants run through scenic trails lined with redwoods and pines, including the challenging San Andreas Trail. The half marathon and 10K courses include asce..

Run for Amma is an annual trail running event held at Skyline Ridge Open Space Preserve near Los Gatos, California. The race offers three distance options: 10K, 30K, and 50K, featuring challenging elevation gains of approximately 980, 3,629, and 5,266 feet respectively. The course showcases scenic t..

The Calero Trail Run - Spring is a trail running event held at Calero County Park in San Jose, California, featuring multiple race distances including a Kids Run, 5K, 10K, 15K, half marathon, 25K, marathon, and 50K. The course offers challenging single tracks, hills, dirt paths, and scenic vistas, m..

The Mt Umunhum Ultras is a trail running event held in San Jose, California, featuring multiple race distances including a 52-mile ultra, 50K, trail marathon, 30K, half marathon, and shorter races like 9-mile, 10K, and 5K. The event offers challenging courses with over 15,000 feet of elevation gain..