Northern Illinois 17 Year Cicadas 2024. Brood xiii, or the northern illinois brood, will emerge in the northern half of the state. Brood xix, known as the great southern brood, contains four species of cicadas and emerges only every 13 years.

Two broods of cicadas are expected to emerge in the coming weeks. Brood xiii, or the northern illinois brood, will emerge in the northern half of the state.