The fourth season of the American television series Bones premiered on September 3, 2008 with a two-hour episode and concluded on May 14, 2009 on the Fox Network. The show changed time slots again, airing on Wednesdays at 8:00 pm ET before moving to Thursdays at 8:00 pm ET in 2009. The season consisted of 26 episodes and averaged 10.8 million viewers.
In the UK, the season premiered on September 25, 2008 and concluded on May 28, 2009 on Sky1, and averaged 827,000 viewers.
4 - 1Yanks in the U.K. Part 1 Sep. 03, 2008
4 - 2Yanks in the U.K. Part 2 Sep. 03, 2008
4 - 3The Man in the Outhouse Sep. 10, 2008
4 - 4The Finger in the Nest Sep. 17, 2008
4 - 5The Perfect Pieces in the Purple Pond Sep. 24, 2008
4 - 6The Crank In The Shaft Oct. 01, 2008
4 - 7The He in the She Oct. 08, 2008
4 - 8The Skull in the Sculpture Nov. 05, 2008
4 - 9The Con Man in the Meth Lab Nov. 12, 2008
4 - 10The Passenger in the Oven Nov. 19, 2008
4 - 11The Bone That Blew Nov. 26, 2008
4 - 12Double Trouble in the Panhandle Jan. 22, 2009
4 - 13Fire in the Ice Jan. 22, 2009
4 - 14The Hero In the Hold Feb. 05, 2009
4 - 15The Princess and the Pear Feb. 19, 2009
4 - 16The Bones That Foam Mar. 12, 2009
4 - 17The Salt in the Wounds Mar. 19, 2009
4 - 18The Doctor in the Den Apr. 02, 2009
4 - 19The Science in the Physicist Apr. 09, 2009
4 - 20The Cinderella in the Cardboard Apr. 15, 2009
4 - 21The Mayhem on the Cross Apr. 16, 2009
4 - 22Double Death of the Dearly Departed Apr. 20, 2009
4 - 23The Girl in the Mask Apr. 23, 2009
4 - 24The Beaver in the Otter Apr. 30, 2009
4 - 25The Critic in the Cabernet May. 07, 2009
4 - 26The End in the Beginning May. 14, 2009