Backrooms is expected to hit streaming on HBO Max in the U.S. sometime around late September 2026 , with a few estimates ranging from mid- September to early October. The movie opened in theaters on May 29, 2026 , and current reporting points to an exclusive HBO Max window after its theatrical run.

What’s known

  • The film is an A24 release that premiered in theaters on May 29, 2026.
  • Multiple outlets say it will stream on HBO Max because of A24’s distribution deal.
  • The most specific timing estimate available puts the streaming debut around September 25, 2026.
  • Other estimates cluster in the mid-September to early October range.

Practical timeline

  1. Theaters first: already out as of May 29, 2026.
  2. Digital rental/PVOD: likely about a month after theatrical release, so around late June or July.
  1. Streaming: most likely late September 2026 on HBO Max.

What to expect

There is no officially locked streaming date in the reporting I found, so this is still an estimate rather than a confirmed announcement. If you want the safest single guess, September 25, 2026 is the clearest date being floated by recent coverage.