Getting rid of groundhogs requires a combination of removal and prevention, because eliminating the animal without sealing off your property just invites the next one. The most effective approaches are live trapping, exclusion fencing, and habitat modification. Which method you choose depends on whether you’re protecting a garden, preventing foundation damage, or dealing with an active burrow under a structure.
Why Groundhogs Are Worth Taking Seriously
Groundhogs aren’t just garden pests. Their burrow systems displace an average of 540 to 720 pounds of earth, and those underground voids can cause real structural problems. Concrete slabs crack or settle unevenly. Sidewalks sink on one side. Foundation walls develop new horizontal cracks from shifting soil pressure. The damage is especially common when burrows run under decks, porches, or crawl spaces, where footings lose contact with stable soil and start to shift.
Beyond structures, groundhogs can strip a vegetable garden in days. They eat leafy greens, squash, beans, and fruit, and their appetite peaks in late summer when they’re bulking up before hibernation.
Live Trapping: The Most Reliable Removal Method
A live trap placed directly outside an active burrow entrance is the fastest way to catch a groundhog. Look for the main entrance, which is usually the one with the largest mound of displaced dirt, and position the trap right at the opening. The trap should have an opening at least 10 inches wide and about 12 inches tall.
To funnel the groundhog into the trap, build a rough barricade around the burrow entrance using whatever’s handy: crates, firewood, boxes, or containers. It doesn’t need to be tall or sturdy. You’re just creating a path of least resistance that leads straight into the trap.
For bait, quartered apples and fresh carrots both work well. Carrots stay fresh longer if you can’t check the trap every few hours, but apples tend to be more enticing. Cantaloupe, watermelon rind, and lettuce are also effective. Wear gloves whenever you handle the trap or bait to reduce human scent transfer, which can make groundhogs cautious.
Set the trap in the evening after the groundhog has gone underground for the night. You’ll likely have it trapped by the next morning.
Check Your State’s Relocation Laws First
Before you trap anything, look up your state’s wildlife regulations. Many states prohibit relocating trapped animals. In New York, for example, it is illegal to move a live-trapped animal off your property, period. You can’t release it in a park, on state land, or on someone else’s property. The reasoning is that relocation spreads diseases like rabies, stresses the animal, and dumps your problem on a neighbor. If you trap a groundhog and can’t legally relocate it, you’ll either need to release it on your own property (which defeats the purpose) or hire a licensed nuisance wildlife control operator to handle removal. Some states also require that animals taken outside of hunting season be buried or cremated immediately.
Groundhogs are generally classified as nuisance wildlife that you can legally trap if they’re damaging your property, but the rules about what happens next vary widely. A quick call to your state’s wildlife agency will save you a potential fine.
Exclusion Fencing: The Long-Term Fix
Trapping removes one groundhog. Fencing keeps all of them out. If you’re protecting a garden, a properly built fence is the single most effective long-term solution.
A standalone groundhog fence should be at least 6 feet high. That sounds like overkill for an animal that lives underground, but groundhogs are surprisingly good climbers. If you’re adding a chew barrier to an existing fence, the wire mesh portion should extend at least 36 to 48 inches above ground, overlapping and pinned to the outside of your current fence.
The material matters. Black PVC-coated welded wire in a 1×1-inch mesh is the standard because it resists chewing, holds its shape, and doesn’t rust. For properties that also have problems with smaller animals like rabbits or voles, a ¼-by-¼-inch mesh handles both. A 2×2-inch mesh works where groundhog pressure is low, but it won’t stop smaller pests.
The underground component is critical. Bury the fence or install an L-shaped apron of heavy-gauge wire mesh along the base, extending outward from the fence line. This prevents groundhogs from digging underneath. For foundation protection, the same L-shaped footer of buried mesh along your foundation wall, deck edge, or shed perimeter stops future burrowing in spots where you’ve already had problems.
Repellents: Useful but Limited
Repellents work best as a supplement to trapping or fencing, not as a standalone solution. They can encourage a groundhog to abandon a burrow or steer clear of specific plants, but they need frequent reapplication and won’t stop a determined animal.
Castor oil is one of the more reliable options. Mix half a cup of castor oil with two cups of water and spray it in and around the burrow entrances. The key detail: only apply it when you know the groundhog is out foraging. If you spray while it’s inside, you’ll just trap it in the burrow.
Cayenne pepper works through both smell and the capsaicin heat. Pour it in a small pile near the burrow entrance, and expect to reapply after rain or wind. You can also spray tender garden plants with a mixture of two teaspoons of cayenne in one quart of water to discourage nibbling.
Used kitty litter poured near one burrow entrance mimics a predator’s scent. Leave the other entrance scent-free so the groundhog has a clear escape route. Blocking all exits just traps the animal inside, which makes the problem worse.
Gas Cartridges for Active Burrows
Fumigation with gas cartridges is a lethal option used for active burrows in open areas. The cartridges contain sodium nitrate and charcoal, which produce carbon monoxide and carbon dioxide when ignited. You puncture the cap, insert a fuse, light it, push the cartridge as deep into the burrow as possible, and immediately seal the entrance with soil or sod.
This method has important limitations. It should only be used in underground burrows, never near buildings where gas could seep into enclosed spaces. Only treat burrows that show clear signs of active use (fresh digging, tracks, droppings) rather than fumigating every hole you find, which risks killing non-target animals like rabbits or snakes that may have moved into abandoned tunnels. Gas cartridges are regulated in many areas, so check local laws before purchasing.
Habitat Changes That Discourage Groundhogs
Groundhogs prefer areas with cover close to food. Removing that combination makes your property less attractive to the next one that wanders through.
- Clear brush and debris piles near garden edges, foundations, and outbuildings. Groundhogs choose burrow sites where they have quick access to cover.
- Keep grass trimmed short in areas bordering your garden or structures. Groundhogs feel exposed in open, mowed areas and prefer to stay near taller vegetation.
- Remove fallen fruit and harvest vegetables promptly. An easy food source is the main reason groundhogs settle in a particular spot.
- Fill abandoned burrows with compacted soil or gravel. An open burrow is an invitation for a new groundhog to move in without doing any digging.
No single method solves a groundhog problem permanently. The most effective approach pairs active removal (trapping or fumigation) with physical barriers (fencing and buried mesh) and habitat changes that make your property a less appealing place to set up a den.