When Groundhogs Move In Under Your House, Act Fast
If you're wondering how to get rid of groundhogs under house naturally, here are the most effective methods:
- Scent repellents – Apply soiled kitty litter, castor oil spray, or predator urine near burrow entrances
- Epsom salt – Sprinkle around burrow openings and reapply after rain
- Physical barriers – Install wire mesh 12 inches deep, bent outward at 90 degrees
- Motion-activated sprinklers – Startle and condition groundhogs to avoid the area
- Burrow eviction – Loosely plug entrances to confirm vacancy, then seal permanently
- Habitat modification – Remove food sources, trim vegetation, eliminate cover
A single burrow can stretch 50 feet long and 5–6 feet deep. When that tunnel runs under your foundation, consequences go far beyond a chewed-up garden. In one documented case, a woodchuck infestation caused a house's foundation to sink, the chimney to shift, and property value to drop by $80,000.
Identifying the Signs of Groundhogs Under Your House
Groundhog burrow entrances are 10–12 inches wide with large mounds of excavated dirt. They start tunnels against solid structures for added roof stability.
Other signs:
- Secondary exits: 2–5 openings—main "front door" plus smaller "spy holes" for escapes
- Vegetation damage: Eaten up to a pound of vegetation daily
- Claw marks: On low wooden supports or trees
- Structural shifts: Sinking porch steps, new foundation cracks
Why You Must Act: The Dangers of Foundation Burrowing
Tunnels run up to 65 feet through soil supporting your concrete slabs. Removing dirt creates "voids." Kansas City rains fill voids, causing soil shift and erosion—leading to foundation sinking. Midwest cases show fireplace chimneys pulling away from houses after groundhogs hollowed earth beneath.
Groundhogs rarely carry rabies but host ticks, fleas, and mites easily migrating to pets.
How to Get Rid of Groundhogs Under House Naturally Using Repellents
Using Scent-Based Deterrents as a Natural Solution
- Soiled kitty litter: Gold standard DIY repellent—scent signals predator
- Predator urine: Fox or coyote urine from garden centers creates "scent fence"
- Ammonia-soaked rags: Mimics urine—tuck into burrow (not too deep)
- Strong spices: Cayenne pepper, garlic paste, or capsaicin liquids
- Human hair: Barbershop clippings in mesh bags near burrow
How to Get Rid of Groundhogs Under House Naturally with Castor Oil and Epsom Salt
- Castor oil spray: 1/2 cup castor oil + 2 cups water + dash of dish soap. Upsets stomachs
- Epsom salt: Bitter, unpleasant taste—bonus: good for soil and plants
- Granular barriers: Gritty, foul-smelling zones groundhogs prefer not to cross
Step-by-Step Guide to Evicting and Excluding Groundhogs
Best time for eviction: July through September (avoid spring/early summer when pups are helpless).
- Verify vacancy: Loosely plug holes with newspaper or dried grass. If undisturbed 3–5 days, burrow is empty
- Apply repellents: While groundhog is out foraging (early morning or late afternoon)
- Install a one-way door: Allows groundhog to leave but prevents re-entry
Physical Barriers and Fencing Techniques
Buried L-footer using heavy-duty welded wire mesh or hardware cloth (holes no larger than 2x2 inches):
- Dig a trench: 12 inches deep around protection area
- The L-shape: Place mesh in trench, bend bottom 12 inches outward at 90-degree angle
- Backfill: Soil or crushed stone
How to Get Rid of Groundhogs Under House Naturally with Motion-Activated Devices
- Motion-activated sprinklers: Infrared sensors detect movement, harmless water burst
- Ultrasonic stakes: Solar-powered, vibrations annoying to burrowers
- Scare tactics: Pinwheels, mirrors, talk-show radio near burrow
Is it legal to trap and relocate groundhogs?
Tricky. Johnson County, Jackson County, and others have specific rules—sometimes illegal to relocate to different properties due to disease spread risk. If legal, take animal 5–10 miles away (strong homing instinct). Always check local wildlife authorities first.
When is the best time of year to address a groundhog problem?
- Spring: Breeding season—removing mothers orphans young
- Mid-to-late summer (July–Sept): Sweet spot—young independent, no deep hibernation yet
- Winter: Deep hibernation November–February—unresponsive to repellents, frozen soil impossible to dig
What are the most common mistakes in DIY groundhog removal?
- Sealing active burrows: Groundhog digs new (more destructive) exit
- Using mothballs: Ineffective and toxic to soil, pets, groundwater—not "natural"
- Ignoring secondary exits: Block one, they use the other four
- Shallow fencing: Mesh not 12 inches deep with outward bend = minor inconvenience
Conclusion
Learning how to get rid of groundhogs under house naturally is about changing the environment so they don't want to return. Yard maintenance matters—fallen fruit removal, trimmed grass, no woodpiles or debris. Frontier Trapper serves Overland Park, Lee's Summit, and Kansas City Metro with permanent solutions and 100% guaranteed results.