Groundhogs (also called woodchucks) look harmless, but a single animal can excavate burrows up to 25 feet long, collapse raised beds, undermine foundations, and devour an entire vegetable garden overnight. This guide covers the 10 best methods to get rid of groundhogs humanely and permanently, ranked from most to least effective.
Key Takeaways
- A properly installed woodchuck fence is the most reliable long-term solution
- The best eviction window is mid-to-late summer (July–September) before groundhogs den up for winter
- Gas bombs are inhumane, often illegal, and less effective than non-lethal methods
- Combining fencing + repellents + burrow exclusion gives the best permanent results
Understanding the Groundhog Problem
Before treating, confirm you actually have a groundhog. Signs include: holes 5–6 inches wide with mounded dirt at the entrance, a large burrowing mammal with a flat head and short legs seen in early morning or late afternoon, gnaw marks on garden vegetables at ground level, and collapsed soil near the foundation or garden beds.
Groundhogs are most active April–September. They hibernate from October to February, so any burrow activity in winter is likely another animal (skunk, rabbit, or opossum) that has moved into a vacant burrow.
1. Woodchuck Fence (Most Reliable Long-Term Solution)
A properly installed exclusion fence is the only method that provides complete, permanent protection. Use 2-inch woven wire mesh or heavy poultry wire:
- Height: At least 3 feet above ground
- Depth: Buried 12 inches underground
- Outward bend: The buried portion should curve outward in an L-shape — groundhogs dig straight down and hit the horizontal barrier
- Top angle: Bend the top 15 inches of the fence outward at 45° — groundhogs are good climbers and this prevents them going over
This fence design also excludes rabbits, deer, and other garden pests — making it the best value investment for any serious vegetable garden.
8. Scare Devices
Motion-activated devices create a startling environment that discourages groundhogs from settling in:
- Motion-activated sprinklers: Most effective — delivers a harmless water burst when triggered
- Mylar balloons and pinwheels: Flashing movement startles groundhogs; move them every few days
- Reflective tape: String around garden perimeter; creates unpredictable light flashes
9. Burrow Exclusion After Eviction
Once you’re sure the groundhog has left, block the burrow permanently. Confirm vacancy by loosely stuffing the entrance with newspaper — if undisturbed for 3 days, it’s empty. Fill the burrow entrance with large rocks, then top with soil. Install a section of fence mesh over the filled hole, anchored with stakes, to prevent re-excavation. Groundhogs are creatures of habit and will try to re-enter known burrow sites.
10. Remove All Attractants
No deterrent works well if your yard is loaded with groundhog food. Keep the garden well-fenced, pick up fallen fruit daily, keep grass trimmed short, remove brush piles and woodpiles near the garden, and eliminate dense undergrowth where groundhogs shelter. A groundhog that finds nothing easy to eat will move on within a few days.
Why Gas Bombs Are Not Recommended
Gas bombs (carbon monoxide cartridges) are marketed for burrowing pest control but are not recommended: they’re inhumane, illegal in many states, can leave gas residue in the soil that harms other wildlife, may not penetrate deep enough to reach the animal, and are unnecessary given the effective humane alternatives above. Always check your local wildlife laws before any groundhog removal.
Frequently Asked Questions
What is the fastest way to get rid of a groundhog?
What do groundhogs hate the most?
Are groundhogs dangerous?
Groundhogs rarely pose a direct danger to humans and generally flee rather than confront. However, they can carry rabies and other diseases. Never handle a groundhog with bare hands. If you encounter one that is behaving abnormally (active midday, disoriented, aggressive), contact animal control — this may indicate rabies.
Is a groundhog the same as a woodchuck?
Yes, groundhog and woodchuck are two common names for the exact same animal: Marmota monax. The name “woodchuck” has nothing to do with wood or chucking — it derives from the Algonquin word “wuchak.” Other regional names include whistle-pig and land-beaver. All refer to the same North American marmot species that hibernates October–February and is responsible for the lawn and garden damage associated with burrowing and foraging throughout spring and summer.
How do I get rid of a groundhog under my deck or shed?
When do groundhogs hibernate and will the problem naturally resolve?
Groundhogs typically enter hibernation October–November and emerge February–March. While the individual animal is inactive during winter, the burrow remains — and another groundhog (or different animal) will move into the vacated burrow within one season. The problem does not resolve on its own. After evicting a groundhog in late summer or autumn, permanently seal the burrow entrance and install exclusion fencing before the animal returns in spring or a replacement moves in.
Evidence and official guidance
- USDA APHIS: Wildlife Damage Management Technical Series — identification, prevention, and management guidance.
