Question: when did season 4 of greys anatomy come out
Answer: Season Episodes Originally aired First aired Last aired 9 March 27 , 2005 ( 2005 - 03 - 27 ) May 22 , 2005 ( 2005 - 05 - 22 ) 27 September 25 , 2005 ( 2005 - 09 - 25 ) May 15 , 2006 ( 2006 - 05 - 15 ) 25 September 21 , 2006 ( 2006 - 09 - 21 ) May 17 , 2007 ( 2007 - 05 - 17 ) 17 September 27 , 2007 ( 2007 - 09 - 27 ) May 22 , 2008 ( 2008 - 05 - 22 ) 5 24 September 25 , 2008 ( 2008 - 09 - 25 ) May 14 , 2009 ( 2009 - 05 - 14 ) 6 24 September 24 , 2009 ( 2009 - 09 - 24 ) May 20 , 2010 ( 2010 - 05 - 20 ) 7 22 September 23 , 2010 ( 2010 - 09 - 23 ) May 19 , 2011 ( 2011 - 05 - 19 ) 8 24 September 22 , 2011 ( 2011 - 09 - 22 ) May 17 , 2012 ( 2012 - 05 - 17 ) 9 24 September 27 , 2012 ( 2012 - 09 - 27 ) May 16 , 2013 ( 2013 - 05 - 16 ) 10 24 September 26 , 2013 ( 2013 - 09 - 26 ) May 15 , 2014 ( 2014 - 05 - 15