Apr 16, 2021 Get ready! We’re about to be bombarded by a swarm of very noisy, very large bugs. A type of cicada that only comes out every 17 years is about to emerge. The Brood X Cicadas (periodical cicadas) have burrowed underground for almost two decades and will make their way to the surface late April into early May. They won’t cause any damage to your home, gardens, crops, or animals.Theyalso won’t harm mature trees, but you should consider protecting newly planted trees by wrapping them with a mesh net. The noise Brood X cicadas make is loud and distinct. In large groups, the sound can reach as high as 100 decibels, which is equivalent to a motorcycle, low-flying plane or lawn mower starting. The sound of a group of cicadas is often compared to the sound of electricity.