Don't trust old hours — check the official Niagara Falls site.

You can’t get exact hours here because they change every year. The park and each attraction reset their schedules seasonally, and third‑party sites are usually outdated by the time you read them.

Peak summer (roughly May–October): the park itself is open roughly 7 am – 11 pm, but that’s a ballpark. Maid of the Mist and Cave of the Winds both run daily, usually starting around 9 am and ending between 6 and 8 pm. The observation tower (Prospect Point) stays open later, often until 10 or 11