Northern Illinois 17 Year Cicadas 2024. This is the first time this has happened since 1803, and it won’t. Shockley says the great southern brood will start.

This year (2024) is a big year for periodical cicadas in illinois, where broods xiii and xix will be emerging throughout much of the state at the same time. This is the first time this has happened since 1803, and it won’t.