The Billings Mustangs are a minor league baseball team base in Billings, Montana. The Mustangs are the Pioneer League Rookie affiliate of the Major League Cincinnati Reds. The team has been a part of the Pioneer League since 1948 with a five-year gap between 1964 and 1968, and has been affiliated with the Reds since 1974 (after an affiliation with the Kansas City Royals). The team was officially established on November 4, 1947.