One Tree Hill is a teen television drama created by Mark Schwahn that premiered on September 23, 2003 on The WB Television Network. The show continued to air on The WB until May 3, 2006 as it was announced that the network would merge with UPN to form The CW Television Network. The fourth season began airing on The CW on September 27, 2006 and continued to air on Mondays at 9/8C, the fifth season finished on the 19th of May 2008. On March 3, 2008, The CW announced that One Tree Hill had been renewed for a sixth season.