Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 4, 1988
Joaquín Andújar granted Free Agency.
Bob Forsch granted Free Agency.
Craig Reynolds granted Free Agency.
Nolan Ryan granted Free Agency.
Harry Spilman granted Free Agency.
Alex Treviño granted Free Agency.
- November 17, 1988
Released Jim Pankovits.
Released Craig Smajstrla.
- December 4, 1988
Traded a player to be named later to the Minnesota Twins. Received Mark Portugal. The Houston Astros sent Todd McClure (minors) (December 7, 1988) to the Minnesota Twins to complete the trade.
- December 5, 1988
Drafted Dave Stapleton from the Milwaukee Brewers in the 1988 rule 5 draft.
- December 13, 1988
Traded Dan Walters to the San Diego Padres. Received Ed Vosberg.
- December 14, 1988
Signed Craig Smajstrla as a free agent.
- December 16, 1988
Signed Jim Clancy as a free agent.
Signed Craig Reynolds as a free agent.
- December 21, 1988
- December 22, 1988
Signed Dave Johnson as a free agent.
- January 10, 1989
Traded Pedro DeLeon (minors), Mike Hook (minors) and John Fishel to the New York Yankees. Received Rick Rhoden.
- January 30, 1989
Signed Dan Schatzeder as a free agent.
- February 7, 1989
Signed Harry Spilman as a free agent.
Signed Ron Washington as a free agent.
- February 16, 1989
Signed Roger Mason as a free agent.
- March 21, 1989
Traded players to be named later to the Minnesota Twins. Received Steve Lombardozzi. The Houston Astros sent Ramon Cedeno (minors) (September 16, 1989) and Gordon Farmer (minors) (September 16, 1989) to the Minnesota Twins to complete the trade.
- March 31, 1989
Traded Vic Hithe (minors) and Dave Johnson to the Baltimore Orioles. Received Carl Nichols.
- April 3, 1989
Selected Eric Yelding off waivers from the Chicago Cubs.
- April 5, 1989
Signed Greg Gross as a free agent.
- April 6, 1989
Traded Troy Afenir to the Oakland Athletics. Received Matt Sinatro.
- May 11, 1989
Released Alan Ashby.
- May 16, 1989
Traded a player to be named later to the Minnesota Twins. Received Mark Davidson. The Houston Astros sent Greg Johnson (minors) (September 6, 1989) to the Minnesota Twins to complete the trade.
- June 5, 1989
Drafted Jeff Juden in the 1st round (12th pick) of the 1989 amateur draft. Player signed June 30, 1989.
Drafted Todd Jones in the 1st round (27th pick) of the 1989 amateur draft. Player signed June 30, 1989.
Drafted Brian Hunter in the 2nd round of the 1989 amateur draft.
Drafted Shane Reynolds in the 3rd round of the 1989 amateur draft. Player signed June 13, 1989.
Drafted Mark Small in the 17th round of the 1989 amateur draft. Player signed June 9, 1989.
Drafted Donne Wall in the 18th round of the 1989 amateur draft. Player signed June 8, 1989.
Drafted Ricardo Jordan in the 22nd round of the 1989 amateur draft, but did not sign the player.
Drafted Ryan Karp in the 73rd round of the 1989 amateur draft, but did not sign the player.
Drafted Desi Wilson in the 87th round of the 1989 amateur draft, but did not sign the player.
- June 19, 1989
Matt Sinatro player rights sold to the Detroit Tigers.
- July 22, 1989
Traded a player to be named later to the Los Angeles Dodgers. Received Javier Ortiz. The Houston Astros sent Ed Vosberg (August 1, 1989) to the Los Angeles Dodgers to complete the trade.
- July 28, 1989
Released Bob Knepper.
- August 9, 1989
Signed Dave Hajek as an amateur free agent.
- August 18, 1989
Traded Billy Hatcher to the Pittsburgh Pirates. Received Glenn Wilson.
- October 15, 1989
Ron Washington granted Free Agency.
- November 13, 1989
Kevin Bass granted Free Agency.
Bob Forsch granted Free Agency.
Greg Gross granted Free Agency.
Rick Rhoden granted Free Agency.
Dan Schatzeder granted Free Agency.
Harry Spilman granted Free Agency.
- December 4, 1989
Drafted William Brennan from the Los Angeles Dodgers in the 1989 rule 5 draft.
Drafted Albert Hall from the Pittsburgh Pirates in the 1989 rule 5 draft.
Drafted Xavier Hernandez from the Toronto Blue Jays in the 1989 rule 5 draft.
Chuck Jackson drafted by the San Francisco Giants in the 1989 rule 5 draft.
- December 6, 1989
Signed Bill Gullickson as a free agent.
Signed Ken Oberkfell as a free agent.
- December 19, 1989
Signed Dan Schatzeder as a free agent.
Signed Harry Spilman as a free agent.
- January 10, 1990
Signed Raúl Chávez as an amateur free agent.
- January 26, 1990
Signed Terry Clark as a free agent.
- February 1, 1990
Signed Brian Fisher as a free agent.
Signed Mark Thurmond as a free agent.
- February 12, 1990
Signed Jim Olander as a free agent.
- February 13, 1990
Signed Roberto Petagine as an amateur free agent.
- March 13, 1990
Traded a player to be named later and Dave Silvestri to the New York Yankees. Received Orlando Miller. The Houston Astros sent Daven Bond (minors) (June 11, 1990) to the New York Yankees to complete the trade.
- March 30, 1990
Traded Lou Frazier to the Detroit Tigers. Received Doug Strange.
- April 1, 1990
Traded Terry Wells to the Los Angeles Dodgers. Received Franklin Stubbs.
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