Raccoons will eat almost anything and are always on the lookout for a good nesting site, so our houses, with all their nooks and crannies and overflowing garbage cans and backyard vegetable gardens, are very appealing. Light, water, noise and chemical repellents may work in the short term, but raccoons eventually learn to ignore them. The best way to discourage these pests is to make your house and garden inaccessible.
- Cut back overhanging tree branches and brush so raccoons can't get onto the roof.
- Add chimney caps, or replace them if they're damaged. Fireplace chimneys make great dens for pregnant raccoons. If you hear raccoons in the firebox in the spring or summer, you may need to wait until the fall for the raccoons to leave before capping the chimney, or else call an animal control specialist.
- Block crawl spaces and other possible entry spots with securely nailed 1/4-in.-mesh hardware cloth. Wait until the fall after the babies are out but before hibernation, or until you're sure the raccoons are gone.
- Raccoons eat garbage, pet food, fruits and vegetables, and fish from garden ponds. Make trash cans inaccessible. Cover fish ponds with netting. Don't leave pet food outside.
- Protect vegetable gardens, especially if you're planting sweet corn, with wire electric fencing (consult the manufacturer's instructions for spacing and wiring instructions). Fencing is available from farm supply stores and Internet suppliers.
- If raccoons have already made a den in your attic or crawl space, put a radio, flashing lights, ammonia, mothballs or commercially available repellents in it, then give them a few nights to leave. To make sure they're gone, stuff the entry with newspapers. If the paper is still in place after a few days, the raccoons have left.