Cheyenne Frontier Days is an outdoor rodeo and western celebration in the United States, held annually since 1897 in Cheyenne, Wyoming. It bills itself as the "World's Largest Outdoor Rodeo and Western Celebration." The event, claimed to be one of the largest of its kind in the world, draws nearly 200,000 annually. Lodging fills up quickly during the peak tourist season throughout southern and eastern Wyoming, into northern Colorado and western Nebraska. The celebration is held during the ten days centered about the last full week of July. In 2008, Cheyenne Frontier Days was inducted into the ProRodeo Hall of Fame.

Rodeo is a competitive equestrian sport that arose out of the working practices of cattle herding in Spain and Mexico, expanding throughout the Americas and to other nations. It was originally based on the skills required of the working vaqueros and later, cowboys, in what today is the western United States, western Canada, and northern Mexico. Today, it is a sporting event that involves horses and other livestock, designed to test the skill and speed of the cowboys and cowgirls. American-style professional rodeos generally comprise the following events: tie-down roping, team roping, steer wrestling, Steer roping, saddle bronc riding, bareback bronc riding, bull riding and barrel racing. The events are divided into two basic categories: the rough stock events and the timed events. Depending on sanctioning organization and region, other events such as breakaway roping, goat tying, and pole bending may also be a part of some rodeos. The "world's first public cowboy contest" was held on July 4, 1883, in Pecos, Texas, between cattle driver Trav Windham and roper Morg Livingston.