Question: when does the season finale of shadowhunters air
Answer: Season Episodes Originally aired First aired Last aired 13 January 12 , 2016 ( 2016 - 01 - 12 ) April 5 , 2016 ( 2016 - 04 - 05 ) 20 10 January 2 , 2017 ( 2017 - 01 - 02 ) March 6 , 2017 ( 2017 - 03 - 06 ) 10 June 5 , 2017 ( 2017 - 06 - 05 ) August 14 , 2017 ( 2017 - 08 - 14 ) 22 10 March 20 , 2018 ( 2018 - 03 - 20 ) May 15 , 2018 ( 2018 - 05 - 15 ) 12 2019 ( 2019 ) 2019 ( 2019 )