90210 season 4

The fourth season of 90210, an American television series, premiered on Tuesday September 13, 2011.

Trevor Donovan was dropped as a regular, as a result of ongoing changes by the new showrunners. He returned as a guest star in the fall to conclude his storyline. However, in late February 2012, it was reported that Donovan would return near the end of the season. The CW ordered two additional episodes for the season, which total at 24. It has also been announced that the show got a fifth and final season.

Season four opened to a 0.9 rating in adults 18–49, even with last season premiere. The series returned from its mid-season break on January 17, 2012, one week later than originally announced.