Project Hail Mary is not “leaving theaters” yet in any fixed, officially announced way I could verify; it opened in theaters on March 19–20, 2026, and theater runs usually depend on ticket sales and local cinema schedules rather than a single nationwide end date.

What’s confirmed

  • The film is in theaters now, with one source listing a U.S. release on March 20, 2026.
  • Another release notice says “in cinemas March 19, 2026,” which suggests some markets started screenings a day earlier.

What that means for you

  • It will likely stay in theaters for several weeks, but the exact date varies by location and demand.
  • IMAX or premium screens may drop it sooner if another major release takes those slots.

Best next step

  • Check your local theater’s schedule for the latest showtimes, since that is the only reliable way to know when it’s ending near you.

If you want, I can also help you estimate how long it may stay in theaters in your area based on typical release windows.