Maika Monroe is joining the cast of Jason Reitman’s “Labor Day,” joining Kate Winslet and Josh Brolin.An adaptation of Joyce Maynard’s novel of the same name, coming-of-age pic is being backed by Indian Paintbrush and Paramount, which had no comment on the casting. Reitman is writing and directing the film, which follows Frank Chambers (Brolin), an escaped convict who seeks shelter with a depressed single mom (Winslet) and her teen son over Labor Day weekend. Tom Lipinski (“Suits”) is in talks to appear in flashbacks as a younger version of Brolin’s character, while Monroe will play Mandy, a farm girl he romances before serving in Vietnam, who eventually becomes his wife and the mother of his child. Reitman and his Right of Way Films partner Helen Estabrook are producing with Lianne Halfon and Russell Smith of Mr. Mudd. Steven Rales and Mark Roybal of co-financier Indian Paintbrush will exec produce. A professional kiteboarder who will soon be seen as Zac Efron’s love interest in Black Bear Pictures’ untitled Ramin Bahrani drama, Monroe is currently filming Sofia Coppola’s next film, “The Bling Ring.” Monroe is repped by Osbrink Talent Agency and Cohen Entertainment.