Dual Cicada Brood Emergence In 2024. Parts of the united states are experiencing a rare natural phenomenon with the simultaneous emergence of two enormous adjacent broods of periodical cicadas. Two separate periodical cicada broods will emerge simultaneously in 17 states this year.

This year, two broods of flying cicadas have appeared at the same time, and it is the first time they have emerged simultaneously since 1803. Billions of cicadas will buzz this spring as two broods emerge at the same time.