The Pendleton Round-Up is a rodeo held in Pendleton, Oregon, United States, during the second full week of September each year, since 1910. The rodeo brings roughly 50,000 people every year to the city of Pendleton. The Pendleton Round-Up is a member of the Professional Rodeo Cowboys Association (PRCA). The Round-Up was incorporated as a non-profit organization July 29, 1910, as the "Northwestern Frontier Exhibition Association."The rodeo was primarily a creation of local ranchers led by Herman Rosenberg.