The fourth season of One Tree Hill began airing on September 27, 2006. The season concluded on June 13, 2007, after 21 episodes. This is the first season to air on the newly formed The CW television network.
Season four rose in ratings, becoming #133 in the Nielsen ratings system with 1.3 rating and averaging 2.99 million viewers. Episode #10 "Songs To Love and Die By" was the highest rated episode of the season by having 4.24 million viewers tuning in and the most viewed among the entire series after season 2 along with the previous one, "Some You Give Away", which had 4.21 million viewers tuning in.
The season had a brief hiatus for three months from February 2007 to May 2007, to make their timeslot available for the short-lived series . The show returned May 2, 2007 to air the last 6 episodes of the season. This marked the first and last season of the show to air into June.
In this season, most episodes were named after rock albums rather than after songs.
The fourth season follows the final months of senior year. Nathan and HaleyâÂÂs pregnancy brings unexpected challenges, both financially and personally. Lucas struggles with his heart condition and unresolved feelings for Peyton and Brooke, and is determined to find out what really happened between Dan and Keith during the school shooting. Peyton uncovers the truth about her adoption and faces terror and heartache at the hands of a stalker. Karen's pregnancy brings Dan closer to her and Lucas, but he finds himself at the mercy of his growing guilt.
<onlyinclude></onlyinclude>
The DVD release of season four was released after the season has completed broadcast on television. It has been released in Region 1. As well as every episode from the season, the DVD release features bonus material such as, audio commentaries on some episodes from the creator and cast, deleted scenes, gag reels and behind-the-scenes featurettes.