Birchall scored his first MLS season goal against Toronto FC on 11 June 2011 in the second minute of the game; he was assisted by Miguel Pedro López. During the off-season he returned to Vale Park for fitness training. He did not rule out a return to Port Vale in the future, though admitted that he was enjoying himself in LA, having made friends with Landon Donovan, David Beckham and Robbie Williams. Galaxy won a treble in 2011, being crowned Supporters' Shield and Conference champions, as well as MLS Cup winners. Birchall came off the bench in the cup final, replacing Adam Cristman on 57 minutes, as Galaxy beat Houston Dynamo 1–0 thanks to a Landon Donovan goal.