Rat burrows in a garden typically appear as smooth, round holes about 2 to 3 inches wide, often found along foundations, fences, compost bins, or under dense vegetation. If you’ve spotted suspicious holes in your garden and want to know whether rats are responsible, the size, shape, and surrounding evidence will tell you what you’re dealing with.
What Rat Burrows Look Like
A completed Norway rat burrow usually has two or three openings: one primary entrance and one or two escape holes, sometimes called “bolt holes.” The entrance is typically 2 to 3 inches in diameter, circular, and noticeably smooth around the edges from repeated use. Over time, heavily trafficked burrows can widen to 4 inches or more. You’ll often see a fan of freshly excavated dirt pushed out from the entrance.
The escape holes are harder to spot. Rats often position them under plants, garden debris, or wood piles, and they may be lightly plugged with soil near the exit point. This makes the burrow system look like it has only one opening when it actually has two or three. If you find one hole, check within a few feet for others partially hidden by vegetation.
Rat Holes vs. Other Garden Animals
Several animals dig holes in gardens, and size is the fastest way to tell them apart. Rat burrows measure 2 to 3 inches across and look polished smooth inside. Chipmunk holes are roughly the size of a silver dollar (about 1.5 inches) and are cleanly dug but lack the worn, smooth quality of a rat hole. Vole holes are much smaller, about the diameter of a dime, and typically appear around the roots of plants. Ground squirrel holes are similar in size to rat holes but distinctly cleaner around the outside, often with visible grooves in the grass connecting one hole to another.
Behavior helps too. Chipmunks and ground squirrels are active during the day and easy to spot. Rats are secretive and almost exclusively nocturnal. If you never see the animal responsible, that alone points toward rats. Seeing rats during daylight hours actually signals a large population, since it means competition is pushing some individuals out of hiding.
Other Signs of Rats in the Garden
Burrows are the most obvious sign, but rats leave plenty of secondary evidence. Droppings are elongated, dark pellets with tapered ends, roughly the size of a raisin. You’ll find them concentrated along travel routes: beside walls, fences, and edges of garden beds. Fresh droppings are dark and moist; older ones turn gray and crumble when touched.
Look for greasy rub marks along the bases of walls, raised beds, or fence posts where rats repeatedly squeeze through the same path. Their fur deposits skin oils that leave dark smudges over time. You may also notice gnaw marks on fruit, vegetables, or nuts still on the plant or fallen to the ground. Rats will chew on roots and stems of ornamental plants too, sometimes stunting or killing them entirely. Damaged vegetables with irregular bite marks, hollowed-out fruit on the ground, and stripped bark near soil level are all typical feeding evidence.
Tracks are harder to find but show up in soft soil or mud. Rat footprints are small, with four toes on the front feet and five on the back, often accompanied by a tail drag mark between the prints.
How to Tell If a Burrow Is Active
Not every hole in your garden has a rat living in it. An active burrow has smooth, compacted edges, clear of cobwebs, leaves, or debris. The entrance looks “used.” An abandoned burrow collects leaves, may have cobwebs across the opening, and often partially collapses.
The simplest test is to loosely fill the hole with soil or crumpled newspaper and check it the next morning. If the material has been pushed aside or removed, something is actively using the burrow. Repeat this for two or three nights to be sure. Fresh droppings or new digging near the entrance are additional confirmation.
Damage Rats Cause in Gardens
Beyond eating your produce, rats gnaw on roots and stems of ornamental plants, sometimes severely enough to kill them. They’ll raid compost bins, eat seeds before they germinate, and damage irrigation lines by chewing through plastic tubing. The burrowing itself can undermine raised beds, destabilize paving stones, and create tripping hazards in lawns.
There’s also a health concern worth knowing about. Rat urine can contaminate garden soil with the bacteria that causes leptospirosis, an illness you can contract through broken skin or mucous membranes when handling contaminated dirt. Gardening is specifically recognized as a risk activity. Initial symptoms resemble the flu: high fever, muscle aches, headache, nausea. In rare cases it progresses to kidney or liver damage. Wearing gloves while gardening in areas with rat activity and washing produce thoroughly are practical precautions.
Closing and Filling Burrows
Filling burrows before eliminating the rats is counterproductive. They’ll simply dig new ones. Once you’ve addressed the rat population through trapping or professional pest control, you can close the holes permanently. This step matters even after the rats are gone, because open burrows attract other animals looking for ready-made shelter.
For each burrow, locate all the openings, including the hidden bolt holes. Pack them with steel wool or hardware mesh first, since rats can chew through most other materials, then fill with sand or concrete. If the burrow is in a garden bed where you’ll be planting, tightly packed soil mixed with gravel works and is easier to dig through later if needed. Make sure the burrow is empty before sealing it. Trapping a rat inside creates an odor problem as it decomposes.
Preventing Rats From Burrowing
Rats choose garden sites that offer food, water, and cover. Reducing all three makes your garden less attractive. Keep compost bins enclosed and elevated. Pick up fallen fruit promptly. Store birdseed and pet food in sealed containers. Clear dense ground cover, wood piles, and garden debris away from the perimeter of beds and structures, since rats prefer to burrow where they have overhead concealment.
For physical barriers, quarter-inch hardware cloth is the standard mesh size for excluding rats. Burying it around raised beds or chicken runs can help, but depth matters. Some gardeners have reported rats tunneling under mesh buried 18 inches deep. The most reliable approach is to fully enclose the bottom and sides of a structure with mesh rather than relying on a buried perimeter alone. For raised vegetable beds, lining the entire bottom with hardware cloth before filling with soil prevents rats from burrowing up into the bed from below.
Keeping grass trimmed short near garden edges removes the cover rats need to move between their burrows and food sources. Rats are cautious animals that avoid open, exposed ground. Even a few feet of clear space between dense plantings and potential burrow sites can discourage them from settling in.