When Are The Cicadas Coming To Illinois 2025. Nearly every story on my news feed references this historic event about to occur in illinois. There are two species of cicadas commonly found in large numbers in illinois.
An article from the university of illinois extension stated that the northern illinois brood, set to emerge in late may 2025, has a reputation for being the largest. For the first time in more than 200 years, two different groups of periodic cicadas will emerge at the same time.