Via WSMV:
The 17-year cicada and the 13-year cicada, which are periodical cicadas, are scheduled to emerge in Middle Tennessee in 2024 and 2025, according to Tennessee Tech University professor Douglas Airhart. The co-emergence is not expected to happen in Tennessee.
In an article published by the university, Airhart says Tennessee last saw the 17-year cicadas in 2008 and the 13-year cicadas in 2011, making way for the two to arrive back-to-back years.
Two types of broods, meaning the grouping of periodical cicadas of the same life cycle that emerge in a given year, are expected to emerge together for the first time in more than 200 years.
Brood XIII and Brood XIX co-emerge every 221 years, according to Cicada Mania. The site says the last time the two broods co-emerged was in 1803, the same year as the Louisiana Purchase.
Of the two, Brood XIX will arrive in Tennessee this spring. The only place the two broods are known to overlap are in or near Springfield, Illinois, according to the website.
