Double Cicada Brood 2024 Wikipedia. Brood xiii, known as the northern illinois. Here's what to expect from this rare phenomenon, which occurs only once every 221 years.

But in 2024, we’re getting two—brood xiii and brood xix. After 13 years or 17 years, depending on their brood, the cicadas will tunnel to the surface to reach maturity and engage in a monthlong, noisy search for a mate.