Castle (TV Series) - Wikipedia

Main article: List of Castle episodes

Castle premiered as a midseason replacement on ABC on March 9, 2009. ABC renewed Castle for a second season with an initial order of 13 episodes (later extended to 24 episodes).[1][2] The second season premiered on Monday, September 21, 2009.[3] In March 2010, ABC renewed Castle for a third, 22-episode season, which began on September 20, 2010.[4] On November 11, 2010, ABC extended the episode order to 24.[5] On January 10, 2011, ABC announced Castle had been renewed for a fourth season for 22 episodes.[6] Season four premiered on September 19, 2011.[7] On December 8, 2011, ABC ordered an additional episode bringing season 4 up to 23 episodes.[8]

On May 10, 2012, Castle was renewed for a fifth season by ABC,[9] which started on Monday September 24, 2012.[10] Two additional episodes were ordered on October 19, 2012, and February 5, 2013, respectively, which brought season 5 up to a total of 24 episodes.[11][12][13] On May 10, 2013, ABC announced via Twitter that Castle had been renewed for a sixth season.[14] On May 8, 2014, ABC renewed the series for a seventh season,[15] which premiered on September 29, 2014.[16] On May 7, 2015, the series was renewed for its eighth season,[17] which premiered on September 21, 2015.[18] On April 18, 2016, ABC and ABC Productions announced that Stana Katic and Tamala Jones would not return for Castle's ninth season, should it be renewed.[19] Despite several other cast members having signed on for a ninth season, on May 12, 2016, it was announced that the show would be canceled instead; the final episode aired on May 16, 2016.[20]

Series overview

Season	Episodes		Originally released
			First released	Last released
1	10		March 9, 2009 (2009-03-09)	May 11, 2009 (2009-05-11)
2	24		September 21, 2009 (2009-09-21)	May 17, 2010 (2010-05-17)
3	24		September 20, 2010 (2010-09-20)	May 16, 2011 (2011-05-16)
4	23		September 19, 2011 (2011-09-19)	May 7, 2012 (2012-05-07)
5	24		September 24, 2012 (2012-09-24)	May 13, 2013 (2013-05-13)
6	23		September 23, 2013 (2013-09-23)	May 12, 2014 (2014-05-12)
7	23		September 29, 2014 (2014-09-29)	May 11, 2015 (2015-05-11)
8	22		September 21, 2015 (2015-09-21)	May 16, 2016 (2016-05-16)