The last episode of "The Summer I Turned Pretty" (TSITP), which is Season 3 Episode 11, will be released on Wednesday, September 17, 2025. It will be available to stream on Prime Video starting at 12:00 a.m. PT / 3:00 a.m. ET (and 5 p.m. AEST in Australia, 8 a.m. BST in the UK). This episode concludes the series, as Season 3 is the final season based on Jenny Han's book trilogy.