Cheyenne Frontier Days is an outdoor rodeo and western celebration held annually since 1897 in Cheyenne, Wyoming, USA. The event, claimed to be one of the largest of its kind in the world, draws nearly 200,000 people every year. Lodging fills up quickly during the peak tourist season throughout southern and eastern Wyoming and even into Colorado and Nebraska. The celebration is held during the ten days centered about the last full week of July.