The last episode of "The Summer I Turned Pretty" is Season 3, Episode 11, titled "At Last." It is indeed the final episode of the series, scheduled to have been released on Wednesday, September 17, 2025. This episode brings closure to the story, concluding Belly's journey and the love triangle involving the Fisher brothers. The series is based on Jenny Han's novels and wraps up after three seasons and three books, making this the definitive end of the TV series.