Double Cicada Brood 2024 Georgia. The northern illinois brood spends 17 years underground before surfacing and is known as brood xiii, while the great southern brood, or brood xix, lives. The double bloom event has led to billions if not trillions of cicadas rising from the ground across parts of the midwest and southeast.

Most of the periodical cicadas the u.s. 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.