Question: when does season 2 of z nation start
Answer: Season Episodes Originally aired First aired Last aired 13 September 12 , 2014 ( 2014 - 09 - 12 ) December 5 , 2014 ( 2014 - 12 - 05 ) 15 September 11 , 2015 ( 2015 - 09 - 11 ) December 18 , 2015 ( 2015 - 12 - 18 ) 15 September 16 , 2016 ( 2016 - 09 - 16 ) December 16 , 2016 ( 2016 - 12 - 16 )