Yes, the third season of "The Summer I Turned Pretty" is the final season of the Prime Video series. The last episode, Season 3 Episode 11, was released on September 17, 2025, and it concludes the storylines from the book trilogy, wrapping up Belly's journey and love triangle. Although the show ends with this season, the creator Jenny Han has confirmed that there will be a movie following the series finale, continuing the story in some form. So, while Season 3 is the final season, the series as a whole will have an additional continuation through a movie.