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One Tree Hill is an American teen television drama. It premiered on September 23, 2003 and aired on The WB in the United States until May 3, 2006. On September 18, 2006, The WB merged with UPN and formed the The CW, so One Tree Hill kicked off its fourth season on the The CW on September 27, 2006 at 9/8C, and now airs weekly. One Tree Hill is filmed in Wilmington, North Carolina.