Check around the exterior of your home for any holes that can allow unwanted guests in. Any holes that are greater than a quarter inch wide, make sure to cover them.
Trim tree branches that are close to the roof of your home. Tree branches should be at least 8 feet away from the roof line. Tree branches are the perfect expressway for squirrels to get into the attic.
Mow the lawn. Long grass gives critters a place to hide and given the opportunity can find a way into your home.
Make sure outdoor trash bins are tightly sealed to prevent unwanted guests from enjoying a buffet.