Ohio's bats do not all spend the year in the same place. The Mammals of Ohio field guide describes big brown bats as common in urban and suburban areas and able to hibernate in attics through the winter. Little brown bats form summer maternity colonies in barns and buildings, then move to caves or mines to hibernate.
Ohio's bats eat flying insects, and they need protection. The Ohio Division of Wildlife reports that four Ohio bat species are state-endangered and that white-nose syndrome has caused population declines of more than 90 percent. Our job is to separate the colony from your home, not to remove bats from the neighborhood.
Ohio law shapes the timing. Under Ohio Administrative Code 1501:31-15-03, exclusion is restricted from May 16 through July 31 when five or more bats are present, and from October 15 through March 31 when any bats are present. The Division's guidelines name April 1 to May 15 and August 1 to October 15 as the preferred exclusion windows, and allow interior routes into living space to be sealed at any time.
For your home, that means we confirm the roost and the colony first, protect your living space right away and time the exterior exclusion to the next window Ohio allows.