 ABC renewed Grey 's Anatomy for a fourth season , which aired from September 27 , 2007 to May 22 , 2008 , and ultimately consisted of seventeen episodes . The fourth season had a reduced number of episodes , due to the 2007 – 08 Writers Guild of America strike , which caused production to cease from February to April , leaving the show with no writing staff during that time . At the beginning of the fourth season , the show aired its final special entitled " Come Rain or Shine " , created to transition viewers from Grey 's Anatomy to Private Practice , which was narrated by the editors of People magazine . The show received a renewal for a fifth season , which premiered on September 25 , 2008 and concluded on May 14 , 2009 ; consisting of twenty @-@ four episodes . The series was renewed for a sixth season consisting of twenty @-@ four episodes , which commenced on September 24 , 2009 and ended on May 20 , 2010 . During its sixth season , Grey 's Anatomy aired a series of webisodes entitled Seattle Grace : On Call at ABC.com. ABC renewed the show for a seventh season , which premiered on September 23 , 2010 and concluded on May 19 , 2011 ; consisting of twenty @-@ two episodes . Following up with Seattle Grace : On Call , Seattle Grace : Message of Hope aired during the beginning of the seventh season . Also during the seventh season , the series produced a musical episode entitled " Song Beneath the Song " , featuring music that became famous through their use in Grey 's Anatomy . The show received a twenty @-@ four episode eighth season renewal , which commenced on September 22 , 2011 with a two @-@ hour episode , and ended on May 17 , 2012 . Grey 's Anatomy was renewed for a ninth season , which premiered on September 27 , 2012 and ended on May 16 , 2013 . Grey 's Anatomy was renewed for a tenth season on May 10 , 2013 and premiered on September 27 , 2013 with a two @-@ hour episode , and ended on May 15 , 2014 . 
