The Astros, who homered twice Sunday afternoon in the 4-2 victory over the Blue Jays at Minute Maid Park, have hit 11 home runs during their five-game winning streak.
The Astros lead the majors with 57 home runs this season.
Third baseman Luis Valbuena hit his team-leading 10th home run of the season with a solo shot to left field in the first inning.
Valbuena and former All-Star third baseman Morgan Ensberg, who had 11 home runs over the first 38 games of the 2006 season, are the only third basemen in franchise history to have 10 home runs over the first 38 games of a season.