<P> On November 29, 2016, Syfy renewed the series for a 13 - episode fourth season . It premiered on September 29, 2017 . </P> <P> As of December 15, 2017, 56 episodes of Z Nation have aired . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 13 </Td> <Td_colspan="1"> September 12, 2014 (2014 - 09 - 12) </Td> <Td> December 5, 2014 (2014 - 12 - 05) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 15 </Td> <Td_colspan="1"> September 11, 2015 (2015 - 09 - 11) </Td> <Td> December 18, 2015 (2015 - 12 - 18) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 15 </Td> <Td_colspan="1"> September 16, 2016 (2016 - 09 - 16) </Td> <Td> December 16, 2016 (2016 - 12 - 16) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 13 </Td> <Td_colspan="1"> September 29, 2017 (2017 - 09 - 29) </Td> <Td> December 15, 2017 (2017 - 12 - 15) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr>

When did z nation season 4 come out