Cicadas Illinois 2025 Schedule. 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. Now that the solar eclipse in illinois is behind us, it's time to look forward to the next rare phenomenon of 2025:
A buzzing cicada symphony will soon fill illinoisโs trees as periodical cicada broods xii and xix are due to. The brood will be highly.