The second season of The Mentalist premiered on September 24, 2009 and concluded in May 2010. It consists of 23 episodes. CBS moved the show from Tuesdays at 9:00 pm to Thursdays at 10:00 pm. The series was renewed for a second season in May 2009 by CBS. The second season of The Mentalist premiered in the United Kingdom on FIVE on Friday February 19, 2010 at 9:00 pm.