Rats Under a Shed or Deck: Burrow Signs and Fixes

Look for holes about two to four inches wide with smooth, packed edges, set along the base of the shed, deck posts or foundation. Fresh dirt piled at the opening, worn paths in the grass and a lack of cobwebs are the clearest signs of a burrow that is in use. Norway rats dig these and use them for nesting and shelter.

A single hole does not tell the whole story. Rats usually have several entrances and a network of tunnels, so one visible hole often means more you cannot see. Walk the full edge of the structure, and check where the shed meets a fence, a wall or a garden bed, since rats like to travel along edges.

If you are unsure, put a loose plug of crumpled paper or a handful of soil in the hole and check it the next day. If it has been pushed out or dug open, the burrow is active. That simple test takes a minute and tells you whether you need to act. Repeat it once more two days later if the first result is unclear.

Food, water and cover. A shed or deck supplies cover, and the yard usually supplies the rest. Rats do not need much, and the leftovers in a typical yard add up quickly.

• Bird seed on the ground beneath feeders, a common food source.
• Open compost piles or bins with loose lids, especially when they hold meat, bread or cooked food.
• Pet food left outside overnight, and dog waste that is not picked up.
• Fallen fruit and nuts from trees and garden beds that no one gathers.
• Clutter such as stacked lumber, tarps, pots and firewood piled against a wall.

Gardens are common in Little Silver, and vegetable beds, heavy mulch and dense plantings also give rats cover and food. Keep mulch thin near the house, pull it back from the shed and deck, and harvest ripe produce promptly.

Rats travel along banks, culverts and drainage ditches, so the edge of a yard that meets a stream or the river is the first place they arrive. If your lot is one of these, look along the yard edge nearest the water before any other.

High water pushes them up as well. After a storm or a big tide, rats that lived along the bank move into higher, drier spots like the space under a deck. If your yard floods, look again a few days later. Our post on Norway rats in waterfront homes covers more of what to expect there.

Rats dig where it is dry, sheltered and close to food. Change any one of those, and they move on.

Homeowner fixes work best when they cut off food and shelter together. Removing food alone does not make the burrow go away. Blocking the burrow alone, without cutting off food, sends rats to dig a new one nearby. Plan on doing both.

For the shed itself, one of the more lasting fixes is to raise it. A shed on a gravel pad or blocks, with open air beneath, gives rats little to hide behind. If you cannot raise it, add a skirt of hardware cloth with quarter inch mesh. A typical approach is to bury it about a foot deep and bend the bottom outward in an L shape, so digging rats hit metal.

Decks need their own approach. Clear stored items from underneath, keep the ground there bare so rats have no cover, and close the perimeter with hardware cloth before digging starts. Leave one section you can lift or open, so that you can shine a flashlight under the deck each month. Check again after heavy rain, since washed-out soil can expose a new hole.

Call when you see several burrows, when droppings show up near the house, when you hear noises in walls or the attic, or when your own fixes have not worked. Burrows near a foundation can lead into a basement or crawl space. Our rat control visits start with an inspection of the whole yard and structure.

A technician looks at the burrow pattern, the food sources and the ways in. Where bait is appropriate, we use tamper-resistant bait stations, placed out of reach of children, pets and wildlife and set as the label requires. We check the burrows over the following visits to see whether activity drops.

Our backyard and outdoor rodent control work pairs treatment with sanitation advice, and rodent exclusion closes the entry points on the house.

You can ask any provider for their NJDEP pesticide license number and confirm it with NJDEP. That is a fair question for anyone who plans to put products on your property.

Loose poison is a real risk to dogs, cats, children and wildlife. Second-generation anticoagulant products can also poison a hawk, owl or pet that eats a poisoned rat, which is called secondary poisoning. That is why the rules require tamper-resistant stations and why we do not scatter bait in the open.

If you have a dog, keep it away from burrows and bait stations, and do not let it dig or roll in the spot. If a pet has eaten something you suspect is rodent poison, call your veterinarian right away and bring the product label. Do not pour bleach, gasoline or other chemicals into a burrow, because they harm soil, pets and neighboring wildlife.