How Long Will Cicadas Last In Illinois 2025. When will periodical cicadas emerge again in illinois after 2025? About six to 10 weeks after they are laid, the eggs will begin to hatch.
One article from the university of illinois extension stated that brood xix, set to emerge in late may 2025, has a reputation for being the largest emergence of cicadas known. The short answer is “no.” archived records indicate that periodical cicadas are primarily found along rivers and their tributaries in.