Cicadas 2024 Brood Xiii. 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. Explore the extraordinary 2024 cicada convergence of brood xiii and brood xix after 221 years.

Billions of cicadas are expected to surface this spring as two different broods — one that appears every 13 years, and another every 17 years — emerge. An animated look at what will happen in the upcoming emergence of brood xix and brood xiii, when more than a trillion cicadas will surface.