Cicada apocalypse 2024 - biggest since 1803

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Billions of cicadas from two different broods will emerge this spring in a rare, buzzy natural phenomenon that hasn’t happened since 1803.

The insects belong to two distinct populations of periodical cicadas: one that surfaces from underground every 13 years and another that emerges every 17 years. The last time these specific groups—called Brood XIII and Brood XIX, respectively—lined up their cycles and appeared at the same time, Thomas Jefferson was president, reports NBC News’ Denise Chow.

Though some cicadas surface every year, periodical cicadas spend most of their lives underground before emerging en masse every 13 or 17 years to mate and start the cycle over again.

Any pair of broods may occasionally overlap and emerge in the same year. But these specific groups—Brood XIII (also known as the Northern Illinois Brood) and Brood XIX (or the Great Southern Brood)—only appear simultaneously once every 221 years, making 2024 an especially exciting period for entomologists and bug aficionados alike.

The next time the broods align again will be in 2245.

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