Double Cicada Brood 2024 Schedule. This year, two broods of flying cicadas have appeared at the same time, and it is the first time they have emerged simultaneously since 1803. The two cicada broods will emerge in a combined 17 states across the southeast and midwest, with an overlap in parts of illinois and iowa.
Billions of cicadas are set to surface this spring as two different broods โ one that appears every 13 years, and another every 17 years โ emerge simultaneously. All of the periodical cicadas sharing the same life cycle that emerge together in a given year are called a brood, although any one species may be part of.