Two cicada breeds to emerge in Tennessee

Two broods of cicadas will make appearances in Tennessee over the next two years, the first time two cicada broods have emerged together in 221 years. Both the 17-year and 13-year cicadas will appear in Middle and West Tennessee in back-to-back years. The last time the 17-year cicadas emerged was 2008 while the 13-year last appeared in 2011. As opposed to yearly cicada broods, periodical broods have life cycles that cause them to merge over a set period of years in the spring. The last time two broods of cicadas appeared in Tennessee was 1803, the same year as the Louisiana Purchase and the departure of the Louis and Clark expedition.