Cicadas This Year 2025. But not all cicadas are periodical: That’s because 2025 will see two separate batches of periodical cicadas emerge en masse, spread across much of the eastern half of the u.s.

A rare burst of billions of cicadas will rewire our ecosystems for years to come. It’s lasting weeks longer than the other two fleeting natural rarities, but in many places the cicada invasion is starting to wind down.