How do I raccoon-proof my home or yard?
Raccoon-proof your home. Cover up potential entrances, such as uncapped chimneys, loose shingles and openings in attics, roofs and eaves. If you're not sure where raccoons are getting in, sprinkle flour around potential entrances and check for footprints later. You can also stuff a rag or ball of paper in a suspect hole and check later to see if it has been removed. Make a raccoon den unlivable. Sprinkle naphtha flakes or predator urine around the area or hang ammonia-soaked cotton rags near the entrance and keep the area brightly lit. Raccoons dislike loud noises, bright lights and strong smells. Use the same methods in your garden or in the area where you keep your garbage or composter. Always cover composters and garbage cans. Use a bungee cord or a heavy weight to keep the lid in place. Make sure that all raccoons or other animals have left before sealing up holes in any part of a building. This is especially important during the season when there may be young (usually March through June, depending on the locale). Block the entrances to a raccoon den once you're sure all the animals have left. You can use sheet metal. Repair siding and holes in buildings, and use heavy rustproof screening to cover open air vents or chimneys. Trim all overhanging tree branches or any other structure that animals might use to get on to the roof of a residence or detached building.  Raccoons and armadillos may dig up grub infested lawns.  Have your lawn treated for insect infestation.     
 

See also:
Raccoons in Garbage
Raccoons in Chimney
Raccoons in Attic or Porch