| | | Friday, June 15th, 1979 | | Drafted SP David Valle in the 1979 first-year player draft (Round 6, Pick 14, 119th overall pick). | | Drafted CF T.J. Carpenter in the 1979 first-year player draft (Round 7, Pick 14, 139th overall pick). | | Drafted SS Lynn Jones in the 1979 first-year player draft (Round 8, Pick 14, 159th overall pick). | | Drafted RF Dave DeGraw in the 1979 first-year player draft (Round 9, Pick 14, 179th overall pick). | | Drafted MR Alfonso Nieves in the 1979 first-year player draft (Round 10, Pick 14, 199th overall pick). | | Promoted 2B Bill Range to Double A McAllen. | | Received SP Jake Park from Double A McAllen. | | Placed 3B Edward Hall on the 15-day disabled list. |
| Wednesday, June 13th, 1979 | | Activated RF Rafael Hernández from the disabled list. |
| Sunday, May 20th, 1979 | | Activated CF Javier Robles from the disabled list. |
| Saturday, May 5th, 1979 | | Placed CF Javier Robles on the 15-day disabled list. |
| Thursday, April 19th, 1979 | | Placed C Arthur MacFadden on the 15-day disabled list. |
| Sunday, September 17th, 1978 | | Activated SP Raúl López from the disabled list. |
| Saturday, September 9th, 1978 | | Activated CF Ronald Bodycoat from the disabled list. |
| Saturday, August 26th, 1978 | | Received 2B Nick Shaw from Double A McAllen. | | Signed Manager Colt Christian to a 2-year contract extension. | | Signed Pitching Coach Mario Rosas to a 3-year contract extension. | | Signed Hitting Coach Lucas Barton to a 1-year contract extension. |
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