How Long Will Cicadas Last In Illinois 2024. This year (2024) is a big year for periodical cicadas in illinois, where broods xiii and xix will be emerging throughout much of the state at the same time. Scientists say cicadas stay underground to avoid predators.
Once they emerge, they’ll be around for between four and six weeks, lawrance added. 2024 is a big year for periodical cicadas in illinois, where broods xiii and xix will be emerging throughout much of the state at the same time.