 "The Vampire Diaries" premiered on September 10, 2009, and gave The CW its biggest series premiere ratings in its network history scoring 4.9 million viewers.Adding in DVR numbers, the ratings for the premiere increased to 5.7 million viewers.Although ratings decreased as the season went on, it reached a series high in adults 18–34 (2.3/7) on October 29, with the broadcast of its Halloween episode.