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Dual Cicada Broods to Emerge in 17 States, Marking Rare Event

For the first time in 221 years, two separate cicada broods will simultaneously emerge across the Midwest and South, an occurrence not expected to repeat until 2245.

A dual emergence is occurring for the first time in 221 years.
Image
A cicada rests on a branch in Alabama in this 2011 file photo. In summer 2024, thousands or even millions of cicadas will emerge in parts of southern Wisconsin.

Overview

  • Researchers from the University of Cambridge have developed a mathematical model explaining how cicadas emerge in large swarms despite variations in local temperatures.
  • In 2024, billions of cicadas from two different broods, one appearing every 13 years and another every 17 years, are expected to emerge, creating a deafening chorus across the eastern and southeastern US.
  • The simultaneous emergence of these broods in 17 states is a rare event, last occurring 221 years ago and not expected to happen again until 2245.
  • Cicadas are harmless to humans and pets but can be dangerous to young trees by laying eggs in small branches, potentially harming the tree.
  • The phenomenon is anticipated to start in mid-May and end in late June, with as many as 1.5 million cicadas per acre in some areas.