Offseason
- December 5, 1978: Pete Falcone was traded by the Cardinals to the New York Mets for Kim Seaman and Tom Grieve.
- January 9, 1979: Bill Mooneyham was drafted by the Cardinals in the 1st round (7th pick) of the secondary phase of the 1979 Major League Baseball Draft, but did not sign.
- January 16, 1979: Darold Knowles was signed as a free agent by the Cardinals.
- January 16, 1979: Benny Ayala was traded by the Cardinals to the Baltimore Orioles for Mike Dimmel.
- February 19, 1979: Will McEnaney was signed as a free agent by the Cardinals.
Read more about this topic: 1979 St. Louis Cardinals Season