How to keep groundhogs out of the garden

Fence it, in a specific shape. Wildlife agencies publish a minimum of 3 ft of wire, with the bottom bent outward into an L and buried, and the top 12 inches left unattached so it flops backward when the animal climbs. A groundhog does both things — climbs and digs — so a fence that stops only one is a fence it gets through.

Why an ordinary fence does not work

Most garden animals do one thing. Deer jump, rabbits squeeze through, squirrels climb. A groundhog — the same animal as a woodchuck — climbs and burrows, and it is good enough at both that a fence built against either one alone simply redirects it to the other method.

That is the whole design problem, and it is why the published answer is a shape rather than a height. Three feet of wire lying flat against the ground will be dug under by the afternoon. Three feet of wire with a buried L-shaped apron and a loose top is a different object entirely.

The published specification

Two sources, and they agree on the essentials. The Internet Center for Wildlife Damage Management states that "fences should be at least 3 feet high and made of heavy poultry wire or 2-inch mesh woven wire", and that you should "bury the lower edge 2 inches in the ground and bend the lower edge at an L-shaped angle leading outward", accompanied by an overhang. Connecticut DEEP puts it at "a sturdy fence at least 3 feet high" with "the fence extend underground another 1.5 to 2 feet" and "a 1-foot extension that is bent outward at a 90-degree angle."

Where the two sources disagree, and which to follow

They differ by an order of magnitude on one number. ICWDM says bury the lower edge 2 inches; Connecticut DEEP says extend it underground 1.5 to 2 feet. That is not a rounding difference and it is worth understanding rather than splitting.

Read them together and the mechanism resolves it: both sources bend the bottom outward, and that horizontal apron is what actually does the work. A digging animal starts at the base of the fence and goes down. An apron lying flat under the soil, pointing away from the garden, means it hits wire wherever it starts. Depth alone does not do that — a groundhog will happily dig deeper than two inches, and deeper than two feet if there is nothing horizontal in the way.

So the honest reading is: the outward L is the specification, and the depth is the margin. Go as deep as your soil and patience allow, but do not skip the bend to buy depth. This is the same logic as the clearance geometry on the feeder side of this site — the shape defeats the animal, not the size.

The floppy top, and why it works

ICWDM's "overhang" is the second half. The practice is to leave the top 12 inches unattached to the posts, bent outward, so it is not a rigid surface.

A groundhog climbs the rigid lower section confidently. When it reaches an unsupported top, the wire folds backward under its weight and the animal loses purchase and drops. A taller fence gives it something solid to climb; a wobbly one does not. It is the closest thing in garden fencing to a spring baffle — weight defeats the climb rather than height.

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Quick picks

Ranked, with the trade-off named. Tap a row for the full write-up; the price button goes straight to Amazon.

#	Product	Best for	Price
1	SANZEUS Welded Wire Fence, 3 ft x 50 ft, 2 x 4 in, 15 gaugeHeavy-gauge welded wire at the 3 ft height wildlife agencies publish for woodchucks, in a 50 ft roll — the right raw material for a fence that has to be buried and bent.	The fence itself, at the published height	$49.99 on Amazon
2	HUNKA Hardware Cloth, 1/2 in mesh, 36 in x 50 ft, 19 gaugeRecommended by specification rather than by brand: 1/2 in mesh, 36 in tall, galvanized. This roll meets it — any roll matching the same three numbers does the same job.	A permanent rabbit barrier	$44.45 on Amazon
3	Tongmo Welded Wire Fence, 3 ft x 100 ft, 2 x 4 in, 16 gaugeThe same 3 ft height in a 100 ft roll. Fewer joins around a real garden, at the cost of a lighter gauge than the 50 ft option.	A long perimeter in one run	$75.99 on Amazon
4	Deer Out Rabbit & Groundhog Repellent, 40 oz ready-to-useOne of the few repellents whose label names groundhogs and woodchucks rather than leaving you to hope. Ready to use, mint-scented, published as rain resistant.	A repellent that actually names the animal	$17.95 on Amazon
5	Messina Animal Stopper Granular RepellentGranular rather than spray, and the only product here whose instructions tell you to apply it to dens, tunnels and entries — which is where a groundhog problem actually lives.	Treating a den or a burrow entrance	$27.98 on Amazon
6	Orbit Yard Enforcer Motion-Activated Sprinkler (62100)The one deterrent device category with a mechanism you can verify from the spec sheet: infrared detection out to 40 ft, and a burst of water the animal cannot argue with.	Deer and raccoons over a wide arc	$89.99 on Amazon

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The picks in full

Top pick The fence itself, at the published height

SANZEUS Welded Wire Fence, 3 ft x 50 ft, 2 x 4 in, 15 gauge

Heavy-gauge welded wire at the 3 ft height wildlife agencies publish for woodchucks, in a 50 ft roll — the right raw material for a fence that has to be buried and bent.

Published specifications

Height

3 ft (published)

Roll length

50 ft (published)

Mesh

2 x 4 in (published)

Gauge

15 (published)

Material

Galvanized steel, welded joints (published)

Working

Published as cuttable and installable with T-posts

Trade-offs

• +3 ft is the height both sources on this page publish as the minimum for woodchucks
• +15 gauge is heavier wire than the 16 gauge most garden rolls use, which matters on a fence an animal climbs
• +Welded rather than woven, so the joints do not slip when you bend the bottom into an L
• +2 x 4 in mesh is small enough for a groundhog and open enough to see through
• −50 ft does not go far around a vegetable plot — measure the perimeter before ordering one roll
• −Galvanized bare wire is visible in a way black PVC-coated fencing is not
• −Cut ends are sharp and the roll has memory; this is a gloves-and-two-people job
• −It is only the wire. Posts, ties and the digging are all still ahead of you

Who it is forA vegetable garden or a run of beds that needs a permanent barrier built to the published spec rather than a temporary screen.

Skip it ifYour perimeter is long. The 100 ft roll costs less per foot and saves a join, and joins are where a burrowing animal gets in.

$49.99 on Amazon

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Where these specifications came from

• Welded Wire Mesh Fence 3ft x 50ft, 2 x 4 in mesh, 15 gauge galvanized wire fence roll (Amazon listing)

No. 2 A permanent rabbit barrier

HUNKA Hardware Cloth, 1/2 in mesh, 36 in x 50 ft, 19 gauge

Recommended by specification rather than by brand: 1/2 in mesh, 36 in tall, galvanized. This roll meets it — any roll matching the same three numbers does the same job.

Published specifications

Mesh

1/2 in x 1/2 in (published); 1 in or smaller is the spec, 1/2 in excludes young rabbits

Roll

36 in W x 50 ft L (published)

Gauge

19, 0.91 mm wire diameter (published)

Material

Hot-dip galvanized over annealed wire (published)

Height above ground

At least 2 ft (Colorado State Extension)

Buried depth

4 to 8 in (Colorado State Extension)

Trade-offs

• +Extension services put chicken wire, hardware cloth or flexible netting at 2 ft high and buried 4 to 8 in as fairly effective against rabbits
• +A permanent fix rather than a reapplication schedule
• +Half-inch mesh also excludes young rabbits, which 2 in poultry netting does not
• +Hot-dip galvanized after weaving, which is the coating that survives being buried
• −Burying the bottom edge is the whole job, and it is real digging
• −Galvanized wire is visible in a way black deer netting is not
• −36 in tall means you are burying roughly a third of what you paid for
• −The listing warns of sharp edges at both ends — this is a gloves job, and nothing about this brand makes it better than any other roll at the same spec

Who it is forA vegetable plot or a border with a persistent rabbit problem, where you would rather dig once than spray for years.

Skip it ifDeer are the actual problem. Two feet of wire is a step-over for a deer; the height that matters there is 8 ft and up. See deer fencing.

$44.45 on Amazon

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Where these specifications came from

• HUNKA Hardware Cloth 1/2 Inch 36 x 50 ft 19 Gauge, hot dip galvanized chicken coop wire fencing (Amazon listing)

No. 3 A long perimeter in one run

Tongmo Welded Wire Fence, 3 ft x 100 ft, 2 x 4 in, 16 gauge

The same 3 ft height in a 100 ft roll. Fewer joins around a real garden, at the cost of a lighter gauge than the 50 ft option.

Published specifications

Height

3 ft (published)

Roll length

100 ft (published)

Mesh

2 x 4 in (published)

Gauge

16 (published)

Material

Galvanized steel, welded (published)

Trade-offs

• +100 ft covers most home vegetable plots without a join
• +Every join in a buried fence is a weak point, and this removes one or two of them
• +Same published 3 ft height and 2 x 4 in mesh as the heavier roll
• +Cheaper per foot than buying two 50 ft rolls
• −16 gauge is lighter wire than the 15 gauge roll — thinner, and easier to deform where it is bent
• −A 100 ft roll of galvanized wire is heavy and awkward to handle alone
• −The listing's own note warns about sharp edges after cutting
• −Still bare galvanized, so it is a visible fence

Who it is forA full garden perimeter where join count and cost per foot matter more than the extra stiffness of heavier wire.

Skip it ifYou are fencing a short run or a single bed. The 50 ft roll in 15 gauge is stiffer where it counts and you will not waste half of it.

$75.99 on Amazon

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Where these specifications came from

• Tongmo 3 ft x 100 ft Galvanized Welded Wire Fence, 16 gauge, 2 x 4 in mesh, garden fence roll (Amazon listing)

No. 4 A repellent that actually names the animal

Deer Out Rabbit & Groundhog Repellent, 40 oz ready-to-use

One of the few repellents whose label names groundhogs and woodchucks rather than leaving you to hope. Ready to use, mint-scented, published as rain resistant.

Published specifications

Size

40 oz ready-to-use (published)

Named animals

Rabbits, groundhogs, woodchucks, gophers (published)

Scent

Mint; published as pleasant to people

Rain

Two natural stickers; published as rain resistant

Season

Published as year-round

Ingredients

Published as all natural

Trade-offs

• +Names groundhogs and woodchucks on the label, which most repellents on the shelf do not
• +Ready to use, so there is no mixing before the first application
• +Publishes a sticker system rather than just claiming rain resistance
• +Mint rather than putrescent egg, which matters on a vegetable plot you walk through
• −Publishes no coverage area and no reapplication interval, so the schedule is yours to work out
• −Ready-to-use is the expensive way to buy any repellent per treated area
• −A repellent shifts a preference; a hungry groundhog with a burrow beside your beans is not reading labels
• −No published duration figure, unlike the deer repellents on this site

Who it is forPlants outside the fence line, or a garden where fencing is not yet built and something has to happen this week.

Skip it ifYou are treating a large plot repeatedly. Buy the concentrate — cost per treated area is what decides whether you keep applying.

$17.95 on Amazon

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Where these specifications came from

• Rabbit & Groundhog Repellent: Rabbit Out 40 oz Ready-to-Use, names rabbits, groundhogs, woodchucks, gophers (Amazon listing)

No. 5 Treating a den or a burrow entrance

Messina Animal Stopper Granular Repellent

Granular rather than spray, and the only product here whose instructions tell you to apply it to dens, tunnels and entries — which is where a groundhog problem actually lives.

Published specifications

Form

Granular, applied with a spreader (published)

Named animals

Armadillos, beavers, gophers, groundhogs, rabbits, raccoons, skunks, woodchucks (published)

Duration

Guaranteed 30 days effective per application (published)

Weather

Published as effective regardless of rain, weather and watering

Application

Apply to dens, tunnels, entries and plants (published)

Ingredients

All natural food grade, plant extracts (published)

Trade-offs

• +Publishes a duration — 30 days per application — which almost nothing in this category does
• +Granular goes where a spray cannot: down a burrow entrance and along a tunnel line
• +Names groundhogs and woodchucks separately in a long species list
• +Published as safe around vegetables, which matters on the plot this is protecting
• −Needs a spreader for even application, which is another thing to own
• −Granules on open soil are a consumable — rain moves them even if the claim is that they keep working
• −A repellent at a burrow entrance may move the animal a few feet rather than off the property
• −30 days guaranteed is a marketing guarantee, not a measured efficacy figure

Who it is forA yard with an active burrow where the goal is to make that specific spot unattractive before it is excluded properly.

Skip it ifThe burrow is under a shed or a porch. That needs galvanized mesh buried along the opening, not granules — and never while the animal is inside.

$27.98 on Amazon

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Where these specifications came from

• Messina Animal Stopper Granular Repellent, names groundhogs and woodchucks, 30 days per application (Amazon listing)

No. 6 Deer and raccoons over a wide arc

Orbit Yard Enforcer Motion-Activated Sprinkler (62100)

The one deterrent device category with a mechanism you can verify from the spec sheet: infrared detection out to 40 ft, and a burst of water the animal cannot argue with.

Published specifications

Detection

Passive infrared

Sensor range

Up to 40 ft, adjustable (published)

Spray duration

Approximately 3 to 10 seconds (published)

Modes

Day and night detection

Function

Dual-purpose: deterrent and sprinkler

Model

62100

Trade-offs

• +Published detection range and spray duration, which almost nothing else in the deterrent aisle offers
• +Water plus noise plus movement is a genuine startle, not a claimed one
• +Day and night modes let you stop it firing at the postman
• −It needs a hose, so its position is decided by your tap as much as by the animals
• −Freezing weather takes it out of service exactly when deer browse hardest

Who it is forDeer, raccoons or cats on a defined approach — a bed, a path, a run of shrubs — during the frost-free months.

Skip it ifYour winter freezes. This is a hose-fed device, and a hose-fed device in January is a burst hose. Fence or repellent for the cold half of the year.

$89.99 on Amazon

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Where these specifications came from

• Orbit 62100 Yard Enforcer motion-activated sprinkler (Amazon listing)

Building it, in order

1. Dig a trench along the fence line, as deep as you reasonably can, with a horizontal shelf on the outside of it.
2. Bend the bottom 12 in of the wire outward at 90 degrees before you set it, so the apron points away from the garden.
3. Set the wire so at least 3 ft stands above ground after the bend, and backfill over the apron.
4. Attach the wire to posts for the lower two thirds only. Leave the top 12 in free and bend it outward.
5. Walk the line and look for gaps at gates, corners and where the ground dips. A burrowing animal finds those first.

If the problem is a burrow under a shed, deck or porch rather than a vegetable plot, Connecticut DEEP's method is the same material in a different place: "galvanized wire mesh along the openings and burying it at least 1.5 to 2 feet underground." The same caution applies here as everywhere on this site — never close an opening that something may still be behind. Squirrel proofing your house sets out why, and it applies to a groundhog under a deck exactly as it does to a squirrel in a roof.

Repellents: what the labels actually say

Here is something worth knowing before you shop. Almost no mainstream repellent names groundhogs. Plantskydd's label lists deer, elk, moose, rabbits, voles, squirrels and chipmunks. Bobbex-R lists rabbit, squirrel and chipmunk. Liquid Fence lists deer and rabbits. None of them names a groundhog, and a label that does not name your animal is not evidence about your animal.

The two on this page do name it, which is the entire reason they are here rather than the products this site usually recommends. Even then, keep expectations calibrated: ICWDM's note on repellent efficacy is narrow — "fox urine has shown some effectiveness in reducing damage to crops and is registered for the control of woodchucks by the Environmental Protection Agency" — and Connecticut DEEP puts it at "commercial taste or odor repellents may provide some level of plant protection." Some level. That is the honest ceiling.

Use a repellent on the plants outside your fence, or while the fence is still a plan. Do not buy one instead of the fence.

The motion sprinkler, which the agency actually endorses

Connecticut DEEP lists a motion-activated noise alarm or spray water among its options, which is unusually specific support for a category that is normally long on claims. A motion sprinkler is covered in depth on the sprinkler roundup and the Orbit review, and everything said there applies here: aim it across the route the animal uses, not at the area, and move it every few weeks because habituation is the standing weakness of any startle device.

On trapping and relocation

This is the most common advice in the category and this site recommends against it, as it does for squirrels and raccoons. For groundhogs there is a regulatory point on top of the practical one: Connecticut DEEP states that "animals should not be released on state lands... nor on private property unless the landowner grants permission." Rules vary by state and it is your responsibility to know yours.

The practical objection is unchanged. A burrow in good habitat is valuable real estate, and removing its occupant leaves the burrow. A fence built to the published shape protects the garden from whichever groundhog arrives next; a trap deals with one animal.

What we would not do

• Build a taller fence instead of a shaped one. Height is the wrong variable — a groundhog climbs a rigid fence and digs under a flat one. The L and the loose top are the specification.
• Skip the apron to save digging. It is the part that actually stops the burrowing, and depth without it just moves the tunnel down.
• Attach the fence to the posts all the way up. A rigid top is a ladder. The top 12 inches are supposed to fail under weight.
• Buy a repellent whose label does not name groundhogs. Most do not. That silence is information.
• Close a burrow entrance without knowing it is empty. Same rule as every exclusion job on this site, and the season matters — young may be present.