<Tr> <Td> </Td> <Td_colspan="1"> 13 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 22, 2016 (2016 - 09 - 22) </Td> <Td> May 18, 2017 (2017 - 05 - 18) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 14 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 28, 2017 (2017 - 09 - 28) </Td> <Td> May 17, 2018 (2018 - 05 - 17) </Td> </Tr> <P> Grey's Anatomy's first season commenced airing as a mid-season replacement to Boston Legal on March 27, 2005 and concluded on May 22, 2005 . The nine - episode season aired on Sundays in the 10: 00pm EST time slot, following Desperate Housewives . The show was renewed by ABC for a second season, that aired in the same time slot as season one . Premiering on September 25, 2005 and concluding on May 15, 2006, the season consisted of twenty - seven episodes . The first five episodes of the second season were originally scheduled to air during the first, but the network decided to close the first season of Grey's Anatomy on the same night as Desperate Housewives' finale . During the second season, Grey's Anatomy produced two specials recapping the events of recent episodes, narrated by Bailey, entitled "Straight to the Heart" and "Under Pressure". The show was renewed for a third season, which was relocated to the coveted Thursday 9: 00pm EST time slot--a slot that the series has held onto since then . Commencing on September 21, 2006 and ending on May 17, 2007, season three consisted of twenty - five episodes . Two more specials were produced during the show's third season, entitled "Complications of the Heart" and "Every Moment Counts", which were narrated by Bailey and Morgan, respectively . </P> <P> 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 . This was followed 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 songs 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 . </P>

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