Season Episodes Originally aired Season premiere Season finale 1 13 October 16, 2011 (2011-10-16) March 18, 2012 (2012-03-18) 2 16 October 14, 2012 (2012-10-14) March 31, 2013 (2013-03-31) 3 16 October 13, 2013 (2013-10-13) March 30, 2014 (2014-03-30) 4 16 October 12, 2014 (2014-10-12) March 29, 2015 (2015-03-29) 5 23 October 11, 2015 (2015-10-11) May 22, 2016 (2016-05-22)