The tunnels, mounds, and holes showing up in your yard are almost certainly the work of one of a handful of common burrowing animals, and each one leaves a distinct calling card. Moles, voles, gophers, chipmunks, groundhogs, and even crayfish all dig through residential landscapes, but the shape of the tunnel, the size and pattern of displaced soil, and whether the entrance is open or plugged can tell you exactly which creature has moved in. Figuring out who is responsible matters because the damage each animal does and the methods for managing it are quite different.
Moles and Their Signature Raised Ridges
Moles are the most commonly blamed yard tunneler, and for good reason. These insectivores spend nearly their entire lives underground, pushing through soil in search of earthworms and grubs. The telltale sign is a network of raised, winding ridges just under the surface of your lawn. These shallow feeding tunnels can appear overnight and feel spongy when you step on them. In addition to the surface ridges, moles create deeper permanent tunnels and push excavated soil up through vertical shafts, forming symmetrical, volcano-shaped mounds of finely processed dirt.
Not all moles leave the same evidence, though. The common eastern mole produces the classic raised ridges and conical mounds that most people picture. The star-nosed mole, which prefers wetter habitats near streams and marshes, behaves differently. Its burrows typically lack surface ridges and mounds altogether, and its tunnel entrances tend to sit along the edges of water and remain unplugged rather than sealed with soil.
Mole activity also shifts with the seasons. Research on burrowing mole-rats, close ecological cousins of true moles, has shown that summer burrow systems tend to be shorter and cover a smaller area than winter ones, with fewer surface mounds indicating less active digging during warmer months.1Journal of Zoology. Season but not sex influences burrow length and complexity in the non‐sexually dimorphic solitary Cape mole‐rat (Rodentia: Bathyergidae) If you notice more tunnel activity in spring and fall than in midsummer, that seasonal pattern fits mole behavior well. Moles follow their food: earthworms and grubs move deeper during hot, dry weather, so moles dig deeper too, leaving your surface lawn temporarily alone.
Voles Leave Shallow Runways, Not True Tunnels
Voles are often confused with moles, partly because the names sound similar, but the damage they cause looks completely different. Voles are small rodents, roughly the size of a mouse, and they create shallow surface runways through grass rather than underground tunnels. You will spot their work as narrow, worn paths about an inch or two wide running through your lawn, often connecting small round holes roughly an inch in diameter. These runways are most visible in spring after snow melts, because voles stay active all winter and their paths become etched into the turf beneath the snow cover.
The key distinction from moles is what they eat. Moles eat insects and worms and do not touch your plants. Voles are herbivores. They gnaw on grass roots, bulbs, and the bark of young trees and shrubs. If you find small teeth marks on the base of a tree trunk or notice that tulip bulbs have disappeared, voles are the likely culprit. Their burrow entrances are small and clean, often hidden under mulch or ground cover, and they rarely push up mounds of soil.
Gophers and Their Fan-Shaped Dirt Mounds
Pocket gophers create some of the most dramatic yard damage. Their signature is a crescent or fan-shaped mound of soil, often with a visible plug of dirt on one side where the gopher sealed the tunnel entrance after pushing out excavated material. These mounds are noticeably different from mole mounds: mole hills are symmetrical and cone-shaped, while gopher mounds are lopsided, with the dirt spread to one side in a fan pattern. A single gopher can produce dozens of these mounds across a yard in a short time.
Gophers are solitary and territorial, so if you are seeing mounds spread across a large area, you may still be dealing with just one or two animals. Their tunnels run deeper than mole feeding tunnels, typically several inches to over a foot below the surface, and they rarely produce the raised surface ridges that moles leave. Instead, the main evidence is the mounds themselves and, occasionally, plants that suddenly wilt or sink because a gopher has chewed through their roots from below. Gophers are strict herbivores and can devastate garden beds, pulling entire plants underground by their root systems.
Chipmunks and Their Deceptively Tidy Holes
Chipmunk burrow entrances are remarkably clean. Unlike gophers and moles, chipmunks carry excavated dirt away from the entrance in their cheek pouches and scatter it elsewhere, leaving a neat hole about two inches in diameter with no surrounding pile of soil. This tidiness is exactly why chipmunk burrows often go unnoticed until there are quite a few of them. The entrances usually appear near foundations, retaining walls, garden borders, or at the base of trees and shrubs.
Chipmunk tunnel systems can be surprisingly extensive, stretching ten feet or more with multiple entrances. Inside, they create separate chambers for nesting, food storage, and waste. The structural concern is mostly limited to the areas right around foundations and patios, where their tunneling can undermine walkways or allow water to channel along unintended paths. In garden beds, chipmunks dig up bulbs, seeds, and small fruits, but they do not create surface ridges or large mounds.
Groundhogs and Their Unmistakable Large Burrows
If the hole in your yard is large enough to fit your fist inside, or bigger, a groundhog is a strong possibility. Groundhog burrow entrances are typically four to six inches in diameter and usually flanked by a conspicuous mound of excavated dirt. Their burrow systems can be massive, extending twenty feet or more underground with multiple entrances and exits. Groundhogs often position at least one entrance on a slope or under a structure like a deck, porch, or shed, using the elevated ground or cover for protection.
The amount of soil a groundhog moves is significant. A single groundhog burrow system can displace hundreds of pounds of earth. This makes them a genuine structural concern when they dig near building foundations, and their burrows can cause tripping hazards for people and livestock. Groundhogs are herbivores with a strong appetite for vegetable gardens, clover, and alfalfa, so damage to garden crops alongside large burrow entrances is a reliable combination for identification.
Rats, Mice, and the Tick Risk That Comes with Rodent Burrows
Norway rats dig burrows that are easy to overlook or dismiss as the work of a smaller animal. Their entrance holes are roughly two to three inches in diameter, often found along foundation walls, under debris piles, beside trash bins, or near compost heaps. The soil around the entrance may be smooth and worn from repeated use. Rat burrows tend to follow edges and walls rather than appearing in the middle of open lawn, and you might notice greasy rub marks on nearby surfaces where the rats repeatedly squeeze through gaps.
Mice, particularly deer mice and white-footed mice, create even smaller holes, often just an inch across, and their tunnels are shallow. Both rats and mice pose health concerns that go beyond property damage. Rodents are important hosts of medically significant ticks, and they serve as reservoirs for pathogens that cause Lyme disease, anaplasmosis, and babesiosis in humans.2PubMed Central. Rodent-targeted approaches to reduce acarological risk of human exposure to pathogen-infected Ixodes ticks A yard with active rodent burrows is a yard with a higher tick population, which is worth knowing if you live in a region where tick-borne disease is common. Managing the rodent population is one of the more effective ways to reduce tick exposure on your property.
Crayfish Chimneys in Wet Yards
If you find small, cylindrical towers of mud pellets rising a few inches out of the ground, especially in a low-lying or frequently wet area of your yard, you are looking at crayfish chimneys. Burrowing crayfish species dig vertical shafts down to the water table and construct these distinctive mud turrets at the surface. The chimneys are not just decorative; research has shown they function as passive ventilation systems for the burrow below. During breezy conditions, air flows through the burrow and exits through the chimney, with chimney height and wind speed having the strongest effects on airflow.3Journal of Crustacean Biology. Crayfish chimneys function as burrow-ventilation structures
Crayfish burrows are common in clay-heavy soils that stay damp, in yards with poor drainage, and near ponds or streams. They rarely cause serious structural damage, but the chimneys can be unsightly on a manicured lawn, and the burrow openings may let water drain into unexpected places. The presence of crayfish chimneys tells you something useful about your yard’s hydrology: the water table is close to the surface in that spot, and improving drainage would discourage the crayfish more effectively than trying to remove them directly.
Skunks and Armadillos Dig Holes, Not Tunnels
Some yard damage gets mistaken for tunneling when it is actually just digging. Skunks and armadillos both tear up lawns searching for grubs and insects, but they do not create tunnel networks. Skunks leave small, cone-shaped holes a few inches deep and wide, scattered across the lawn in an irregular pattern. They peel back turf to get at grubs just below the surface, and the damage tends to appear overnight since skunks are nocturnal.
Armadillos, found mainly in the southeastern and south-central United States, create similar but larger divots. Their holes are typically three to five inches wide and can be surprisingly deep for what looks like casual foraging. Armadillos use their powerful claws and long snouts to root through soil, and a single armadillo can pock-mark a lawn with dozens of holes in one night. The distinction from true tunneling animals is important for management: skunks and armadillos are responding to a grub or insect population in your soil, so treating the food source with grub control often resolves the digging without having to deal with the animal directly.
Snakes Use Existing Burrows Rather Than Digging Their Own
Finding a snake emerging from a hole in your yard does not mean the snake dug it. Snakes lack the limbs and body structure for excavation and almost universally repurpose burrows dug by rodents, chipmunks, or other animals. A snake living in a burrow in your yard is secondary evidence that a burrowing mammal was there first, and the original digger may still be nearby or may have been the snake’s meal. If you want to discourage snakes from taking up residence, focus on the primary burrower and the habitat features that attract them, such as brush piles, tall grass, and rodent food sources.
How to Read the Clues
When you walk out and find fresh damage, a few quick observations can narrow down the suspect list considerably:
- Raised surface ridges: Almost certainly a mole. No other common yard animal creates this pattern.
- Fan-shaped dirt mounds with a plug: Pocket gopher. The plug and asymmetry distinguish it from the symmetrical cone of a mole mound.
- Worn surface runways: Voles. Look for the small, round connecting holes about an inch wide.
- Clean two-inch holes with no dirt pile: Chipmunks. Check near foundations and garden edges.
- Large holes with big dirt piles: Groundhog. Especially if the entrance is four inches or wider.
- Holes along walls and foundations: Rats. Look for grease marks and droppings nearby.
- Mud chimneys in wet ground: Burrowing crayfish. The water table is close to the surface there.
- Scattered shallow divots: Skunks or armadillos foraging for grubs, not a tunneling animal.
Plant damage offers a second layer of identification. If your garden plants are vanishing from below, gophers or voles are eating the roots. If bark is gnawed at ground level, voles are the likely problem. If your vegetable garden is being raided above ground and you also see a large burrow, a groundhog is the combined answer. Moles, despite their reputation, do not eat plants at all, so if your lawn has raised ridges but your garden is untouched, the mole is just hunting worms.
When Burrowing Animals Are Doing Your Yard a Favor
It is worth stepping back from the damage assessment to acknowledge that burrowing animals play a real role in keeping soil healthy. Earthworms and ants contribute to soil structure and fertility through their burrowing, improving aeration and water infiltration.4American Journal of Life Sciences. Soil Fauna as Webmasters, Engineers and Bioindicators in Ecosystems: Implications for Conservation Ecology and Sustainable Agriculture Moles do the same thing on a larger scale: their tunnels break up compacted soil, improve drainage, and their appetite for grubs reduces pest populations. A mole working through your yard is aerating your soil more effectively than any tool you could rent.
Groundhog and gopher burrows, while destructive in the wrong place, create habitat for other species. Abandoned groundhog dens are used by foxes, rabbits, opossums, and countless other animals. The ecological value does not erase the frustration of a ruined lawn or a compromised foundation, but it does mean that coexistence is sometimes the better choice, especially if the animal is in a part of the yard where the tunneling is not causing a practical problem.
Using Technology to Find Hidden Burrows
Sometimes the biggest challenge is not identifying the species but finding where their tunnels actually go, particularly in areas with heavy vegetation or ground cover. Thermal imaging technology has become increasingly practical for this purpose. Research has demonstrated that both consumer-grade and professional thermal cameras mounted on drones can detect active burrow systems, especially when vegetation is sparse, by picking up the radiant heat difference between a burrow opening and the surrounding ground.5PubMed Central. Hot stuff in the bushes: Thermal imagers and the detection of burrows in vegetated sites For a homeowner, this level of technology is overkill for a handful of mole ridges. But for someone managing a larger property, a farm, or a situation where groundhog or gopher burrows are threatening infrastructure, a thermal survey can reveal the full extent of a tunnel system that visual inspection alone would miss.
Even without thermal imaging, you can map tunnel networks with simpler methods. Probing the soil gently with a thin metal rod lets you trace a mole’s shallow tunnel by feeling for the soft, collapsed areas just below the surface. For deeper tunnels like those of gophers or groundhogs, watching for secondary entrance holes and following the line of disturbed soil between them gives you a rough sense of the underground layout. Knowing the tunnel’s path helps if you decide to set traps, install exclusion barriers, or simply monitor whether the animal is still active after attempting other deterrents.