King of the Hammers is an annual off-road race held in Johnson Valley, California. It combines elements of rock crawling and desert racing, attracting competitors from around the world. The event typically takes place in February and features various classes of vehicles, including Ultra4 cars, which are specially designed for extreme terrain. The race covers a challenging course that spans over 200 miles, with sections that test both speed and technical driving skills. Participants must navigate rocky trails, steep hills, and desert landscapes, making it one of the toughest off-road races globally. The event also includes a festival atmosphere, with vendors and entertainment for spectators.