Groundhogs can be killed legally through shooting, lethal trapping, and burrow fumigation, but every method comes with legal requirements that vary by state, and ignoring those rules can result in fines or criminal charges. The specifics of what you’re allowed to do depend heavily on where you live, whether you’re in an urban or rural area, and whether the animal is actively causing property damage. Getting this right matters, because a groundhog problem left unchecked leads to structural damage, ruined gardens, and burrow systems that can undermine foundations and outbuildings.
Check Your State Laws Before Doing Anything
Groundhogs (also called woodchucks) occupy a legal gray area that catches many homeowners off guard. In some states they’re classified as game animals with defined hunting seasons, while in others they’re considered unprotected wildlife that can be taken year-round on your own property. A few states require a specific nuisance wildlife permit before you can kill one, even on land you own. In Illinois, for instance, woodchucks are protected as game animals, and removing one in an urban area requires a nuisance animal removal permit issued by the state Department of Natural Resources.1Wildlife Illinois. Woodchuck or Groundhog Connecticut similarly requires that all hunting of woodchucks follow state hunting laws and firearms discharge regulations.2Connecticut Department of Energy & Environmental Protection. Woodchuck Nuisance Problems
The practical takeaway: before you set a trap, load a rifle, or light a gas cartridge, call your state wildlife agency or visit their website. Look up whether groundhogs are classified as game, furbearers, or unprotected species in your jurisdiction. Find out whether there’s a specific season, whether you need a hunting license or a nuisance permit, and whether firearms discharge is legal in your municipality. Rural landowners usually have more latitude than suburban homeowners, but even in agricultural areas, some methods are restricted.
Why Groundhog Damage Escalates Quickly
The reason people reach for lethal methods is that groundhog damage tends to compound. A single groundhog excavates a burrow system with multiple entrances, often extending 40 feet or more underground. The digging can undermine building foundations, patios, retaining walls, and driveways. Agricultural damage is equally serious: groundhogs feed voraciously on garden crops, soybeans, alfalfa, and clover, and they can flatten a vegetable garden in days.3The Institute for Environmental Research and Education. What problems do groundhogs cause?
The structural concern is the one that pushes most people past deterrents and toward lethal control. A burrow that runs under a concrete slab or foundation wall creates voids that cause settling, cracking, and in worst cases, partial collapse. Equipment like tractors and mowers can drop into burrow openings in fields, creating safety hazards. If you’re dealing with a single groundhog eating tomatoes in a backyard garden, exclusion fencing might be all you need. But once you see multiple burrow entrances near a structure, or damage to a field where livestock could step into a hole, the calculus shifts.
Shooting
Where it’s legal, shooting is the fastest and most straightforward method. Groundhogs are above-ground feeders during daylight hours, especially in early morning and late afternoon, and they tend to stay close to their burrow entrances. A .22 caliber rifle is the most commonly used firearm for groundhogs, though some people use shotguns at close range. A well-placed shot is arguably the most humane lethal method available because death is immediate.
The constraints are mostly legal and logistical. Many municipalities ban the discharge of firearms within city or town limits, which makes this a non-starter in suburban neighborhoods regardless of whether the state allows groundhog hunting. Even in rural areas, you need a clear line of fire with a safe backstop, and you need to know where neighboring properties and roads are. Connecticut’s wildlife agency emphasizes that all woodchuck hunting must comply with both state hunting laws and local firearms discharge regulations.2Connecticut Department of Energy & Environmental Protection. Woodchuck Nuisance Problems If you live in an area where shooting is feasible, it’s also worth confirming whether you need a hunting license, since some states require one even on your own property.
Air rifles are sometimes floated as an alternative for areas where firearm discharge is restricted. High-powered air rifles in .22 or .25 caliber can kill a groundhog at close range, but they require precise shot placement and are not universally legal for pest control. Check your local ordinances before assuming an air rifle sidesteps firearms laws.
Lethal Trapping
Body-gripping traps, sometimes called Conibear traps, are the primary lethal trap type used for groundhogs. These are spring-loaded traps that kill by clamping down on the animal’s neck or chest, causing rapid loss of consciousness. The most commonly used size for groundhogs is the 220 or 330 body-grip trap, set at or near a burrow entrance.
Setting body-grip traps effectively requires some knowledge. The trap needs to be positioned flush with the burrow opening so the groundhog walks through it while entering or exiting. Most trappers stake the trap securely and use guide sticks or wire to funnel the animal into the trigger mechanism. A poorly set trap can injure without killing, which is both inhumane and often illegal under state trapping regulations.
There are real risks to non-target animals with body-grip traps, and this is where many states impose restrictions. Dogs, cats, raccoons, and opossums can all trigger these traps. Several states require that body-grip traps used above ground be set inside an enclosure or directly at a burrow entrance to reduce the chance of catching a pet or non-target species. If you have dogs that roam your property, or if your neighbors do, body-grip traps near burrow entrances in open areas create a genuine danger. Some trappers build wooden boxes around the trap to exclude larger animals while still allowing groundhog-sized animals through.
Live-catch cage traps followed by lethal dispatch are another option in some jurisdictions. You bait a cage trap with apple slices, cantaloupe, or fresh vegetables, capture the groundhog alive, and then kill it by shooting or another approved method. This approach avoids the non-target risk of body-grip traps, but it requires you to check the trap frequently (most state regulations mandate at least once every 24 hours) and to carry out the killing yourself. It also raises the question of whether relocating the animal is legal in your state, since many states prohibit releasing captured wildlife elsewhere due to disease transmission concerns.
Burrow Fumigation With Gas Cartridges
Gas cartridges are an option when you know where the groundhog’s burrow is and want to kill the animal underground without having to see or handle it. These are incendiary devices that produce carbon monoxide when ignited and are designed to be inserted into burrow systems. The USDA’s National Wildlife Research Center registers gas cartridges specifically for fumigating the burrows of woodchucks, marmots, ground squirrels, and prairie dogs.4USDA Animal and Plant Health Inspection Service. NWRC Research Areas: Regulatory Support Services-Product Registration
The technique is straightforward but demands attention to detail. You ignite the cartridge, place it inside the burrow opening, and seal the entrance with soil to trap the gas inside the tunnel system. Before you do any of this, you need to locate and seal every other entrance to the burrow, because groundhog burrows typically have two to five openings. If even one exit is left unsealed, the gas dissipates and the groundhog escapes. Finding all entrances usually means walking the area carefully and looking for mounds of excavated soil, which can be subtle in tall grass or brush.
Fumigation has several important limitations. It should never be used near buildings, because carbon monoxide can seep through foundations, cracks in basement walls, or into crawl spaces. The USDA labels for these products typically warn against use within a certain distance of occupied structures. It also should not be used when the ground is very dry, as fires can smolder along root channels underground and surface later. Spring, when the soil is still damp, is the safest season for fumigation. You should also avoid fumigation from late spring through early summer if young groundhogs might be in the burrow, since immobile pups make fumigation arguably less humane, and many state guidelines discourage it during the breeding season.
What About Poison
People frequently ask whether they can poison a groundhog. The short answer is that there is no rodenticide or toxicant registered by the EPA specifically for groundhog control. Using a product not labeled for groundhogs, like rat poison or anticoagulant bait, is a violation of federal pesticide law under FIFRA (the Federal Insecticide, Fungicide, and Rodenticide Act). Beyond the legal issue, secondary poisoning is a serious concern: a poisoned groundhog can be eaten by a hawk, fox, or neighborhood dog, passing the toxicant up the food chain. Some people try antifreeze or other household chemicals, which is both illegal and unpredictable. The animal may die slowly underground, creating an odor problem, or may not die at all. Poison is the wrong approach here.
The gas cartridge method described above is sometimes confused with “poisoning,” but it’s a registered fumigant with specific label instructions, which makes it a legal product when used according to those instructions. The distinction matters legally and practically.
Non-Lethal Methods Worth Trying First
If you haven’t already tried deterrents, it’s worth considering them before escalating to lethal control, especially if the damage is limited to garden plants rather than structural undermining. Exclusion fencing is the most reliable non-lethal option: a fence made of heavy-gauge welded wire, at least three feet tall with an additional foot buried underground in an L-shape facing outward, will keep groundhogs out of a garden. The buried footer prevents them from digging under.
Repellents, both commercial and homemade, have a mixed track record. Castor oil-based sprays, predator urine, and ammonia-soaked rags placed near burrow entrances can sometimes discourage activity, but groundhogs habituate quickly. If food is plentiful and the burrow is established, repellents rarely drive a groundhog off the property entirely. They can be useful as part of a broader strategy, not as a standalone solution.
Harassment techniques like repeated disturbance near the burrow, flooding the tunnel system with a garden hose, or installing motion-activated sprinklers can also push a groundhog to relocate on its own. These work best early in the season, before a female has a litter and is committed to the den site. Once young are present, the mother is unlikely to leave regardless of how much you annoy her.
Hiring a Professional
Licensed nuisance wildlife control operators handle groundhog removal in every state. The cost varies widely depending on the number of animals, the complexity of the burrow system, and your location, but expect to pay somewhere between $150 and $500 for a typical residential job. The operator handles the legal paperwork, sets and monitors traps, and disposes of the animal according to state regulations.
Hiring a professional makes particular sense in a few situations: you live in a municipality with strict firearms and trapping regulations; the burrow system is under or very near a building foundation where fumigation is unsafe; you’re uncomfortable with the process of killing the animal yourself; or you suspect multiple groundhogs are present. A single groundhog on a rural property is manageable for most capable adults. A family group burrowed under a suburban deck is a different proposition, and the liability of a body-grip trap near where children and pets play often tips the balance toward a licensed operator.
Timing and Seasonal Considerations
Groundhog behavior changes significantly through the year, and this affects which methods work best. They emerge from hibernation in late February to March, depending on latitude, and are most active from April through October. The best time to trap or shoot is early spring, when groundhogs are actively foraging after months of hibernation and before females give birth (typically in April or May). An adult removed in March means no litter that year.
Summer is the peak damage season and when most people notice the problem, but it’s also when young groundhogs are mobile and dispersing. You may kill one adult and find another juvenile has moved into the vacated burrow within weeks. If you’re dealing with a persistent problem on a property that attracts groundhogs (abundant food, good cover, well-drained soil for burrowing), you may need to combine lethal control with habitat modification. Removing brush piles, mowing tall grass near structures, and eliminating food sources like fallen fruit or unharvested garden crops makes the property less attractive to the next groundhog looking for a territory.
Late fall is another productive window. Groundhogs are feeding heavily to build fat reserves before hibernation, making them predictable and responsive to baited traps. By November in most northern states, they’ve entered their dens for the winter, and lethal methods become impractical until spring. Fumigation in late fall, just before the animal settles in for hibernation, can be effective because the groundhog is spending long stretches underground and all burrow entrances are being used less, making them easier to locate and seal.