<P> The fourth season of the American television series The Flash , which is based on the DC Comics character Barry Allen / Flash , premiered on The CW on October 10 , 2017 , and ran for 23 episodes until May 22 , 2018 . The season follows a crime scene investigator with superhuman speed who fights criminals , including others who have also gained superhuman abilities . It is set in the Arrowverse , sharing continuity with the other television series of the universe , and is a spin - off of Arrow . The season is produced by Berlanti Productions , Warner Bros. Television , and DC Entertainment , with Andrew Kreisberg and Todd Helbing serving as showrunners . </P>
<P> The fourth season of the American television series The Flash , which is based on the DC Comics character Barry Allen / Flash , premiered on The CW on October 10 , 2017 , and ran for 23 episodes until May 22 , 2018 . The season follows a crime scene investigator with superhuman speed who fights criminals , including others who have also gained superhuman abilities . It is set in the Arrowverse , sharing continuity with the other television series of the universe , and is a spin - off of Arrow . The season is produced by Berlanti Productions , Warner Bros. Television , and DC Entertainment , with Andrew Kreisberg and Todd Helbing serving as showrunners . </P>
when did the flash season 4 come out
when did the flash season 4 come out
October 10 , 2017
October 10 , 2017