How Long Will Cicadas Last In 2024 In Hindi. The trigger is when the soil reaches 64 degrees at a depth of 8 inches.  — according to lawrance, two groups of cicadas — one known as brood xiii, the other as brood xix — will surface at the same time in illinois, creating a rare event that hasn't happened for 221.

It’ll happen again in 2037. Two broods of cicadas, brood xix and brood xiii—which emerge every 13 years and 17 years, respectively — are appearing.