Cicada Emergence 2024 Map Illinois. Two broods, or groups of periodical cicadas , are emerging simultaneously for the first time in 200+ years (since 1803), and illinois is one of two states (the other being iowa) where both broods will be making an. If you haven't seen them yet, you may have heard them:

Check out where broods xiii, xix will emerge. It’s lasting weeks longer than the other two fleeting natural rarities, but in many places the cicada invasion is starting to wind down.