Bed bugs are a year-round problem, not just during the fall. Infestation can ramp up in fall, but that isn’t because they’ve moved in from the outdoors. If you have bed bugs, the chances are they’ve been reproducing, spreading and biting for months and you are just now noticing.
While other pests hibernate or search for warmer temperatures indoors, the bed bug has been inside the entire time. Bed bugs are an indoor pest and are rarely found outside.
Therefore, the climate outdoors is not really a factor for why bed bugs are a big problem in the fall. It is the actions we humans take when the seasons change, and we move back indoors to get away from the colder weather.
Fall indicates the end of summer, but it doesn’t mean the end of bed bugs. When we take that last summer vacation, and the kids go back to school, we may be introducing bed bugs into our lives for the first time, and it isn’t until a few months later that we start to notice them.