The most reliable way to get rid of groundhogs is a combination of exclusion and habitat change: a 3-to-4-foot fence with a floppy, unclimbable top and a wire footer buried or aproned outward at least 12 inches, hardware-cloth barriers around sheds and decks, and removal of the brush piles and tall weedy cover they use for security. Repellents and scare devices help only at the margins, and trapping is a last resort with real legal strings attached — many states restrict relocating wildlife, so check your state’s regulations or call a licensed wildlife control operator before setting a trap. Poison is never the answer: no toxicant is registered for groundhogs in most jurisdictions, and baits put pets, raptors, and scavengers at risk.
Groundhogs (also called woodchucks) earn their reputation honestly. A single adult can eat more than a pound of garden produce a day in late summer, and its burrow system — often 20 to 30 feet of tunnel with multiple entrances — can undermine sheds, stoops, and retaining walls. The good news is that groundhog control is one of the more solvable wildlife conflicts, because the animal is diurnal, predictable, and strongly tied to its burrow. This guide works through the options in the order most homeowners should try them, including what actually holds up and what wastes a summer.
Step 1: Confirm It’s Actually a Groundhog
Effective control starts with correct identification, because the fixes differ by animal. Groundhog sign is distinctive: a main burrow entrance 10 to 12 inches across with a fan of fresh soil outside it, secondary entrances without soil (dug from below), and vegetation mowed low in a patch near cover, during daylight. Deer leave torn browse at knee-to-chest height; rabbits leave clean angled clips on stems under a few inches; pocket gophers leave crescent-shaped mounds with no open hole at all — if that sounds like your yard, you have a different project, and our overview of gophers and their burrowing habits is the place to start. And because groundhogs share garden tastes with deer, many gardeners are fighting both at once; the exclusion logic below pairs well with our guide to keeping deer out of the garden.
Fencing: The Fix That Actually Works
A properly built fence is the closest thing to a permanent solution, but groundhogs are surprisingly capable animals — they dig well, and they climb better than almost anyone expects. A fence that stops them needs to defeat both skills:
- Height: 3 to 4 feet of sturdy 2-inch (or smaller) mesh such as welded or woven wire.
- A floppy top: leave the top 12 to 15 inches unattached to the posts and bent outward at roughly 45 degrees, so a climbing groundhog’s own weight tips it back off.
- An underground defense: bury the bottom 10 to 12 inches, or bend it into an outward-facing L-shaped apron pinned flat at ground level, so a digging animal hits mesh and quits.
- Tight gates: the gap under a gate is the most common failure point — give it a sill or apron as well.
A single strand of electric fence wire 4 to 5 inches off the ground, offset a few inches outside the mesh, dramatically improves results where it is safe and legal to run one. Gardeners fencing against deer at the same time can combine systems: the tall deer fence handles the leapers while the mesh skirt and hot wire handle the diggers. Our deer-proof garden guide shows how the layers fit together.
Evicting Groundhogs From Under Sheds, Decks, and Porches
A burrow under a structure calls for exclusion rather than fencing. The method wildlife professionals use is straightforward but must be done in the right order. First, confirm the burrow is occupied — loosely ball up newspaper and stuff it into each entrance, or sift flour at the opening and check for tracks. Second, make the space unpleasant for a few days: clear vegetation around the entrances, and consider harassment such as leaving a rag lightly soaked in used cat litter near (not sealed into) the hole. Third, once activity has stopped, trench around the structure’s perimeter and install hardware cloth (half-inch mesh) from the framing down 12 inches and then outward in a 12-inch L-footer, leaving one entrance fitted with a one-way door for several days before closing it permanently.
Timing matters enormously. From roughly April through July, a burrow may hold dependent young that cannot leave through a one-way door. Sealing them in is inhumane and, in practice, self-defeating — the mother will tear at your exclusion work, and dead young under a deck create a serious odor problem. If you cannot wait until late summer, hire a licensed wildlife control operator who can verify and remove the whole family.
Habitat Modification: Make the Yard Less Inviting
Groundhogs settle where food sits close to secure cover. Remove one side of that equation and marginal habitat stops holding animals: mow the weedy margins and tall grass strips where they feed, clear brush piles and junk that shelter burrow entrances, harvest vegetables promptly, pick up windfall fruit, and clean up spilled birdseed. None of this evicts a settled adult by itself, but it lowers the odds of the burrow being re-occupied after an eviction — empty groundhog burrows are prime real estate, and a new woodchuck (or a skunk or rabbit) will move into an attractive vacancy within weeks. Collapsing and filling old burrows after confirmed vacancy is worth the shovel work.
Repellents and Scare Tactics: Modest Help, Managed Expectations
The honest summary is that repellents are supporting actors. Capsaicin (hot pepper) sprays on ornamentals, predator-urine granules near burrow entrances, and motion-activated sprinklers all have their moments, and the sprinkler in particular can protect a small bed for a while. But groundhogs habituate to anything that never actually hurts them, rain strips sprays weekly, and ultrasonic devices and vibrating windmill stakes have little credible evidence behind them. We reached the same conclusion testing scent-based products against deer — see our review of organic deer repellents — and the pattern holds across species: repellents buy time; barriers end problems. Use sprays to protect plants while you build the fence, not instead of it.
Trapping, Relocation, and the Law
Live trapping seems like the humane, tidy option, and sometimes it is a necessary one — but it carries more legal and welfare complications than most homeowners expect. Regulations vary widely by state and even by municipality: many states prohibit relocating trapped wildlife off your property (to limit disease spread and because relocated animals often die or simply become someone else’s problem), some require same-day dispatch or on-site release, and a few require permits even to trap. Check your state wildlife agency’s rules before a trap ever goes out, and when in doubt hire a licensed operator who knows them.
If trapping is legal and genuinely needed, a one-door cage trap of raccoon size (roughly 10 x 12 x 32 inches) set directly in the burrow path or a few feet from the main entrance, baited with cantaloupe or apple slices and lightly camouflaged, is the standard approach. Check traps at least twice daily, never set them in heat you would not sit in yourself, and expect the vacancy problem noted above: trapping without exclusion is a subscription, not a solution. Finally, skip the folk remedies that shade into cruelty or hazard — flooding burrows near structures, engine exhaust, and improvised gas cartridges all cause more trouble than they solve, and poison baits are both unregistered for this use and dangerous to everything else in the food chain.
A Realistic Battle Plan
Pulling the pieces together, here is the sequence that solves most groundhog problems in a single season. First, confirm the animal and find every burrow entrance — walk the fence lines, shed perimeters, and brushy edges within about 150 feet of the damage, since a groundhog rarely feeds farther from home than that. Second, protect what matters now: fence the vegetable garden properly (or at minimum cage the most-hit beds), and use repellents or a motion sprinkler as a stopgap while the fence goes up. Third, evict and exclude from any burrow under a structure, timed for late summer or early fall when no dependent young are present. Fourth, degrade the habitat — mow, clear brush, remove food subsidies — and collapse vacated burrows so the property stops advertising vacancies. Trapping enters only if a specific animal defeats all of the above, and only after checking state rules.
Expect the timeline to be weeks, not days, and measure success by damage stopped rather than animals gone. A groundhog you never see, feeding on clover in the back field behind a fence it cannot cross, is a solved problem — and a cheaper, quieter one than a trapping campaign.
When Doing Nothing Is a Legitimate Option
It is worth saying plainly: a groundhog burrow in a back corner, away from structures and fenced gardens, is not an emergency. Groundhogs are native wildlife with a genuine ecological role — their abandoned burrows are premium housing for rabbits, foxes, skunks, and opossums, and their digging turns and aerates remarkable quantities of soil. A tolerated groundhog also occupies a territory that would otherwise be claimed by the next dispersing animal, so “the devil you know,” excluded from the places that matter, is often the most stable arrangement available. Reserve the full campaign for animals actually undermining structures or defeating your defenses — and enjoy the picket-pin sentry on the back fence the rest of the time.
What smell keeps groundhogs away?
Strong predator and irritant odors — used cat litter, predator urine granules, capsaicin, and garlic — can make a burrow entrance or bed less comfortable for a while. Treat scent as harassment during an eviction, not as long-term protection: groundhogs habituate quickly once they learn nothing bad follows the smell.
Will groundhogs come back after relocation?
A relocated groundhog rarely returns — but that is not the real issue. Studies and rehabilitator experience suggest many relocated animals die in unfamiliar territory, which is why several states ban the practice, and your empty burrow will simply attract the next groundhog. Exclusion and burrow closure are what keep the property clear; check your state’s relocation rules before trapping at all.
Do groundhogs damage foundations?
They can. A burrow system moves a surprising amount of soil, and tunnels along a foundation, slab, or retaining wall can cause settling or undermine stoops and shed floors over time. Damage is gradual rather than sudden, so an eviction and hardware-cloth exclusion done this season is almost always cheaper than masonry repair in five years.
When do groundhogs leave the burrow for good?
They don’t, voluntarily — a good burrow is used for years, by generations of groundhogs. But there are two windows when the resident is naturally elsewhere: juveniles disperse in mid-to-late summer, and adults hibernate from roughly October or November to February or March. Late summer through early fall, after young have dispersed and before hibernation, is the ideal season for evictions and permanent exclusion work.
