ABC has confirmed the Grey’s Anatomy Season 18 finale date — and announced that it will be a two-hour finale, with the last two episodes of the season airing back-to-back.
Season 18, Episode 20 is called “Out for Blood” and will air at 8 p.m. EST on Thursday, May 26, 2022. It will be immediately followed by Season 18, Episode 21, “You Are the Blood” at 9.
Source: https://www.distractify.com/p/is-this-the-last-season-of-greys-anatomy