2024 Cicadas Months In. Cicadas count years, likely using the flow of tree sap. This spring, two broods of cicadas, totalling more than a trillion, will emerge from the earth in search of mates and blanket huge swaths of the u.s.

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. Trillions of cicadas will emerge in 2024.