To get rid of groundhogs and eliminate their burrows, you must first ensure the animal has completely vacated the tunnel before sealing the entrance with wire mesh, gravel, and packed soil. Combining mild harassment techniques, habitat modification, and exclusion fencing prevents these persistent burrowers from returning. Once the groundhog leaves, backfilling and compacting the earth preserves your yard’s structural integrity.
Identifying Groundhog Burrows and Damage
Groundhogs, also known as woodchucks, create expansive underground tunnel systems that can stretch up to 45 feet long and plunge up to 5 feet deep. These burrows typically feature a main entrance that measures 10 to 12 inches in diameter, surrounded by a large mound of excavated dirt. In addition to the main opening, a burrow system usually contains two or three secondary escape holes, which are often hidden under dense vegetation, rocks, or shed foundations.
It is important to distinguish groundhog damage from that of other wildlife. While filling rat burrows in your yard involves tackling small openings around 2 to 4 inches wide, groundhog burrows are significantly larger and pose serious structural risks. Groundhogs frequently dig near building foundations, wooden decks, retaining walls, and farm equipment paths, leading to sinkholes, cracked concrete, and damaged lawn machinery.
How to Get Rid of Groundhogs
Removing a groundhog from your property requires a multi-step approach focused on making the area unwelcoming and physically restricting access to potential nesting spots.
1. Remove Food Sources and Cover
Groundhogs are drawn to properties that offer easy access to vegetation. Understanding what groundhogs eat is key to deterring them. They feed heavily on wild grasses, clover, garden vegetables, berries, and ornamental plants. To make your yard less attractive:
- Harvest garden produce promptly and clear fallen fruit from trees.
- Trim low-hanging branches and thick brush where groundhogs feel safe hiding.
- Install underground fencing around raised garden beds and crop patches.
- Keep lawn grass short to reduce cover and eliminate broadleaf weeds.
2. Use Humane Eviction Techniques
Before filling any hole, you must encourage the groundhog to relocate on its own. Attempting to trap or bury an active animal can lead to unnecessary distress or cause the animal to dig new escape exits beneath your yard.
- Disturbance: Place battery-operated radios tuned to talk channels near the burrow entrance. The human sound discourages them from lingering.
- Lighting: Motion-activated floodlights or solar-powered flashing lights installed near the main hole disrupt their preferred dark environment.
- Odors: Commercial repellents containing castor oil or predator scents (such as coyote urine) can be applied around the perimeter of the burrow. Always follow the product label instructions when using any repelling agent or consider consulting a licensed professional pest control operator.
3. Live Trapping and Professional Removal
If habitat changes and eviction methods do not work, live trapping may be necessary. Wire mesh cage traps should be placed near active burrow entrances and baited with fresh apples, cantaloupe, or leafy greens. Check local wildlife regulations before setting traps, as many regions have strict laws regarding animal relocation. If live trapping is restricted or unmanageable, contact a local wildlife removal professional.
How to Fill and Collapse Groundhog Burrows
Once you are certain the groundhog has left the burrow system, you can move forward with backfilling to prevent other animals from taking over the tunnel network.
Step 1: Test for Activity
Never fill a burrow without verifying that it is empty. Loosely stuff the entrance with crumpled newspaper or place small twigs across the opening. Check the site daily for three days. If the paper or twigs remain undisturbed, the tunnel is likely vacant. If the material is pushed aside, the groundhog is still inside, and eviction efforts must continue.
Step 2: Install Wire Mesh Exclusion Barriers
Groundhogs will easily redig filled dirt if the opening is not physically reinforced. Dig out a shallow trench about 12 inches deep around the entrance hole. Lay down heavy-duty hardware cloth or steel mesh over the opening, ensuring it extends at least 12 to 18 inches beyond the perimeter of the hole. Curve the bottom edges of the mesh outward in an L-shape to prevent animals from digging underneath the barrier.
Step 3: Fill with Heavy Materials
Do not rely solely on topsoil to fill a groundhog hole, as soft soil settles and collapses over time. Follow this layered filling process:
- Pour a layer of coarse gravel or crushed stone directly into the bottom of the burrow entrance to create a dense base layer.
- Add a mixture of clay soil and gravel, tamping it down firmly with a wooden post or heavy hand tamper every few inches.
- Fill the top layer with standard topsoil and tamp down the surface until it aligns with the surrounding lawn.
Step 4: Restore the Turf
Rake the filled area smooth and sow grass seed or lay sod over the exposed soil. Keep the region well-watered until new grass establishes. Monitor the site weekly for signs of settling or renewed digging activity.
Health and Safety Considerations
Groundhogs and their burrows carry specific health risks for humans and domestic animals. Groundhog tunnels create severe trip hazards for adults, children, and pets, potentially causing sprains or broken bones if stepped on unexpectedly. In addition, wild rodents harbor ectoparasites like fleas and ticks. While common misconceptions surround ticks burrowing under skin, ticks do anchor tightly to feed and can transmit bacterial illnesses to both people and pets.
Safety Precautions
- Keep children and pets away from active burrows, live traps, and chemical deterrents.
- Wear heavy leather gloves and long sleeves when handling fencing, wire mesh, or soil around wild burrows.
- If a human or pet is bitten, scratched, or comes into contact with a sick wild animal, wash the wound thoroughly with soap and water and seek immediate medical attention or contact a veterinarian.
Frequently Asked Questions
When is the best time of year to fill a groundhog burrow?
The best time to fill a groundhog burrow is late summer or early autumn after young groundhogs have left the nest, or early spring before mating season begins. Avoid sealing burrows during late spring, as dependent offspring may be trapped inside.
Will bleach or ammonia drive groundhogs out of their burrows?
Pouring harsh household chemicals like bleach or ammonia into burrows is strongly discouraged. These substances contaminate soil, damage local plants, harm beneficial wildlife, and pose safety hazards to pets and children.
How deep do groundhog burrows usually go?
Groundhog burrows generally extend 2 to 5 feet underground and span between 15 and 45 feet horizontally, often incorporating multiple chambers for sleeping, nesting, and waste disposal.
Conclusion
Getting rid of groundhogs requires a balanced approach of eviction, habitat modification, and structural repair. By ensuring the animal has abandoned the den, layering stone and packed earth, and securing the entrance with wire mesh, you can permanently seal groundhog burrows and protect your yard from future damage.