Big trees, and why some nests show up in the fall
Every wasp nest in New Jersey starts in spring with a single queen and a nest smaller than a golf ball. Through the summer the colony grows, and by August and September it's at its largest. Yellow jackets in particular get more aggressive late in the season, when their colonies are big and they start looking for sugar.
In a town with as many mature trees as Englewood, a lot of hornet nests go unnoticed all summer because the leaves hide them. Then the leaves drop in the fall and a homeowner suddenly sees a basketball-sized nest over the driveway. If it's late in the fall and the weather has turned cold, the colony may already be dying off β but on a warm fall day there can still be active hornets inside. If you're not sure, send us a photo and we'll tell you whether it needs treatment.
Old nests aren't reused the next year, but the same sheltered spots attract new queens every spring. Checking eaves, porches and sheds in May β while nests are still tiny β is the easiest way to stay ahead of them.