Cicada 2024 Factsheet. The arrival of brood xix and brood xiii will send shockwaves through forest food webs. Periodical cicada broods will spend over a decade underground, and will only emerge after either 13 or 17 years.

The arrival of brood xix and brood xiii will send shockwaves through forest food webs. What makes the cicadas in 2024 a rare event is the simultaneous emergence of two different broods — brood xix and brood xiii.