Dead of Summer Season 2 has yet to be officially renewed (or cancelled) by Freeform. However, executive producers Edward Kitsis and Ian Goldberg have confirmed plans for a second season of the anthology series, which will take place in 1970, per EW:
Amy says Deb isn’t so innocent. What did she mean by that?
GOLDBERG: That is setting up what we hope to do if there’s a season 2 of the show. We’re going to go back to 1970, the summer when Deb was a counselor, and pay off what Amy is talking about right there when she says, “You’re not so innocent.”
KITSIS: The idea is that this, like Fargo, is an anthology series. We see Deb as a counselor, and we’re going to flash back to her summer as a camper. So although each year of the show will take place in a different year of camp, they may all be tied together through characters and relationships, just like we saw Joel’s brother as a counselor in the Townie-Braces flashback and in Joel’s.
GOLDBERG: But you see, too, starting in episode 8, Deb’s starting to remember things that she’s repressed. The eclipse jarred something loose for her, and there’s a lot more still to be recovered from what happened back in 1970 that she may not even realize yet.
Stay tuned as we monitor the status of Dead of Summer Season 2 renewal…