Following the hiring of Bo Porter as manager for the 2013 season, Bjornson was reassigned as a roving pitching instructor and replaced as bullpen coach by Dennis Martínez.

Reassigned SS Jesse Garcia, OF Donzell McDonald, and OF Bo Porter to Richmond.

The Houston Astros named Bo Porter as their new manager for the upcoming season.

Sent OF Bo Porter to Oklahoma.

Sent OF Bo Porter to Oklahoma of the PCL.

Purchased the contracts of RHP Scott Service, INF Mark Bellhorn and OF Bo Porter from Sacramento.

Recalled OF Bo Porter from Iowa of the PCL.

Song written by Bo Porter performed this night @ Luckenbach Texas.

On September 27, the Astros named Bo Porter to be the manager for the 2013 season.

On October 19, 2012, the Astros announced that Mallee would be their hitting coach for 2012, working under Bo Porter.