If you live by a field or in the woods, it is likely that you will always have to deal with mice every fall and winter. Your best strategy is to seal as many openings and holes in the exterior walls as possible and to put weather strips on the bottom of all doors, especially the garage door, to prevent mice from entering. If you can stick a pencil through a crack or hole, a mouse can squeeze through it. Place live traps inside the garage on either side of the doorway to catch mice and rats as they enter. Check the traps often. Make sure all foundation and attic vents have 1/4-inch hardware cloths tightly fitted over the opening and do the same for any turbine vents in the roof. Trim all tree branches at least 10 feet from the roof.