February 24, 2017
Cardinals 
sign
Adolis Garcia
March 30, 2017
Cardinals
place
John Gant
on the injured list
Cardinals
place
Alex Reyes
on the injured list
May 05, 2017
Cardinals
place
Stephen Piscotty
on the injured list
May 20, 2017
Juan Yepez
traded from
Braves
to
Cardinals
Matt Adams
traded from
Cardinals
to
Braves
May 28, 2017
Cardinals
place
Kolten Wong
on the injured list
June 15, 2017
Cardinals
place
Kolten Wong
on the injured list
June 19, 2017
Cardinals
sign
Jake Walsh
June 20, 2017
Cardinals
sign
Kodi Whitley
June 25, 2017
Cardinals
place
Dexter Fowler
on the injured list
June 27, 2017
Cardinals
sign
John Nogowski
June 28, 2017
Cardinals
sign
Scott Hurst
July 02, 2017
Lane Thomas
traded from
Blue Jays
to
Cardinals
Cardinals
sign
Kramer Robertson
Cardinals
sign
Jesus Cruz
July 14, 2017
Cardinals
place
Randal Grichuk
on the injured list
July 15, 2017
Cardinals
place
Stephen Piscotty
on the injured list
July 21, 2017
Tyler O'Neill
traded from
Mariners
to
Cardinals
Marco Gonzales
traded from
Cardinals
to
Mariners
July 25, 2017
Cardinals
place
Dexter Fowler
on the injured list
Cardinals
place
Adam Wainwright
on the injured list
August 18, 2017
Cardinals
place
Adam Wainwright
on the injured list
November 02, 2017
Lance Lynn
became a free agent
December 01, 2017
Aledmys Diaz
traded from
Cardinals
to
Blue Jays
December 05, 2017
Cardinals
sign
Miles Mikolas
as a free agent
December 14, 2017
Stephen Piscotty
traded from
Cardinals
to
Athletics
Max Schrock
traded from
Athletics
to
Cardinals
Yairo Munoz
traded from
Athletics
to
Cardinals
Magneuris Sierra
traded from
Cardinals
to
Marlins
Zac Gallen
traded from
Cardinals
to
Marlins
Marcell Ozuna
traded from
Marlins
to
Cardinals
Daniel Castano
traded from
Cardinals
to
Marlins
Sandy Alcantara
traded from
Cardinals
to
Marlins