Double Cicada Brood 2024. The northern illinois brood spends 17 years underground before surfacing and is known as brood xiii, while the great southern brood, or brood. For the first time in 221 years, this spring will see billions, if not trillions, of cicadas take to the skies in a rare synchronized.
The next simultaneous emergence of these broods isn’t expected. Others, like brood xxii in the south.