"The Hills" first season commenced airing on May 31, 2006. The series continued to air on Wednesday evenings until its conclusion on August 2, 2006, at which point it had aired ten episodes. The second season was expanded to twelve episodes and premiered on January 15, 2007, in its new timeslot on Mondays. The finale aired on April 2, 2007. The third season began airing on August 13, 2007, where it remained in the timeslot of the previous season. It is the longest season in the series' history, having broadcast twenty-eight episodes by its finale on May 12, 2008. The fourth season premiered on August 18, 2008, during the Monday schedule. It consisted of twenty episodes, and concluded on December 22, 2008.