The last episode (Season 3, Episode 11) of "The Summer I Turned Pretty" (TSITP) will be released on Wednesday, September 17, 2025. The new episodes of Season 3 are released weekly on Wednesdays at 12:00 a.m. PT (3:00 a.m. ET) on Prime Video. Season 3 has a total of 11 episodes, making it the longest and final season of the series. So, the final episode will be available for streaming starting the early hours of September 17, 2025 (PT time) on Prime Video.