Pest Control
How to Keep Armadillos Out of Your Yard: A Complete Deterrence Guide
The Armadillo Problem: Why They Target Your Lawn
The nine-banded armadillo (Dasypus novemcinctus) has rapidly expanded its range across the southern and southeastern United States. Unlike grazers that eat your grass, armadillos are insectivores that destroy turf roots while hunting for soil-dwelling prey. A single armadillo can dig up to 200 burrows and excavate dozens of shallow foraging holes in a single night, leaving lawns looking like they have been tilled by a miniature rototiller. Learning how to keep armadillos out of your yard requires a multi-phased approach targeting their food supply, physical access, and foraging instincts.
Identifying Armadillo Damage vs. Other Diggers
Before deploying deterrents, confirm that armadillos are the culprits. Misidentifying the pest leads to wasted money on ineffective treatments. Armadillos leave distinct signatures compared to other common lawn-damaging mammals.
| Animal | Hole Shape & Size | Depth | Primary Target |
|---|---|---|---|
| Armadillo | Cone-shaped, 3-5 inches wide | 1 to 6 inches deep | Grubs, earthworms, beetle larvae |
| Skunk | Circular, clean edges, 2-3 inches wide | 1 to 3 inches deep | White grubs, soil insects |
| Raccoon | Large patches of peeled-back sod | Surface to 2 inches | Grubs, earthworms |
| Feral Hog | Massive wallows, deep rooting, 12+ inches | 6 to 24 inches deep | Roots, tubers, deep grubs |
Phase 1: Eradicate the Food Source (Soil Insect Control)
Armadillos visit your yard because it operates as an all-you-can-eat buffet. If you eliminate their food source, they will naturally move on to more productive foraging grounds. The most effective long-term strategy is biological grub control.
Expert Protocol: Beneficial Nematode Application
Product: Heterorhabditis bacteriophora (Hb) nematodes (e.g., Arbico Organics NemaSeek Hb).
Cost: Approximately $45 for 10 million nematodes (covers 2,000 sq. ft.).
Timing: Apply in late spring or early fall when soil temperatures are strictly between 60°F and 90°F.
Application Steps:
- Mow the lawn short and remove thatch deeper than 0.5 inches.
- Irrigate the lawn with 0.5 inches of water to soften the soil crust.
- Mix nematodes in a hose-end sprayer (remove any mesh filters that will trap them).
- Apply evenly across the turf during dusk or on a heavily overcast day (UV light kills nematodes in minutes).
- Immediately irrigate with another 0.5 inches of water to wash the nematodes into the root zone where grubs reside.
For severe, immediate infestations where biological control is too slow, a conventional insecticide containing chlorantraniliprole (such as Acelepryn) provides excellent grub control with lower toxicity to non-target pollinators compared to older neonicotinoids. Expect to pay $60 to $80 for a granular application covering a standard 5,000 sq. ft. lawn.
Phase 2: Install an Exclusion Fence (The 40-Degree Rule)
If food eradication is insufficient, physical exclusion is the only guaranteed method to stop armadillos. Armadillos are poor climbers but exceptional diggers. A standard privacy fence or surface-level chicken wire will fail completely.
To build an armadillo-proof barrier, you must use 1/2-inch galvanized hardware cloth (not chicken wire, which they can easily crush and push through). According to wildlife management guidelines published by the Texas A&M AgriLife Extension, the fence must follow the "40-Degree Rule":
- Buried Depth: Dig a trench 12 to 18 inches deep along the perimeter. Bury the bottom edge of the hardware cloth in this trench to prevent them from tunneling underneath.
- Above Ground Height: The fence must extend at least 24 inches above the soil surface.
- The 40-Degree Angle: The top 12 inches of the above-ground fencing must be bent outward, away from your yard, at a 40-degree angle. When an armadillo attempts to climb the fence, this outward slant shifts their center of gravity, causing them to fall backward.
Cost Estimate: 1/2-inch hardware cloth costs roughly $2.50 to $3.50 per linear foot. Trenching labor will add to the expense if you do not dig it yourself.
Phase 3: Deploy Targeted Repellents and Live Traps
When fencing is impractical for large acreage, a combination of soil repellents and strategic trapping can reduce local populations.
Castor Oil Repellents
Armadillos rely heavily on their highly sensitive olfactory organs to locate food beneath the soil. Castor oil-based repellents (such as Bonide MoleMax or Nature's Mole & Vole Repellent) coat the soil and the insects within it, making the area unpalatable and irritating the armadillo's snout. Apply these granular repellents at a rate of 1 lb per 1,000 sq. ft. and water them in lightly. Reapply every 3 to 4 weeks, or immediately after heavy rainfall.
Live Trapping Tactics
Trapping requires understanding armadillo behavior. They do not respond well to standard sweet baits like peanut butter. The Clemson University Home & Garden Information Center recommends using the Havahart 1081 live trap (10" x 12" x 32"), which is sized perfectly for a nine-banded armadillo.
| Strategy | Pros | Cons | Best Use Case |
|---|---|---|---|
| Castor Oil Repellents | Easy to apply; covers large areas; non-toxic to pets. | Requires frequent reapplication; washes away in heavy rain. | Moderate damage; large properties where fencing is too expensive. |
| Live Trapping (Havahart 1081) | Permanent removal of the specific offending animal. | Labor intensive; requires daily checking; strict relocation laws. | Localized damage; small yards; persistent individual armadillos. |
| Beneficial Nematodes | Treats the root cause (grubs); improves overall soil health. | Takes 2-4 weeks to see results; strict temperature requirements. | Lawns with confirmed high grub populations. |
Pro-Tip: The Dirt Ramp Baiting Method
Armadillos have poor eyesight and follow physical barriers. To funnel them into a Havahart trap, place the trap directly in their active pathway or burrow entrance. Build small "V-shaped" dirt or wooden ramps leading directly into the trap door. For bait, place overripe bananas or a nylon stocking filled with live earthworms at the very back of the trap, behind the trigger pan. The dirt ramp prevents them from bypassing the trigger.
Legal Constraints and Relocation Rules
Before trapping, you must understand local wildlife regulations. In states like Texas and Florida, armadillos are classified as nuisance wildlife and can be trapped year-round. However, live relocation is frequently illegal.
Relocating armadillos is discouraged for two critical reasons:
- Disease Transmission: Nine-banded armadillos are one of the only known animal reservoirs for Mycobacterium leprae, the bacterium that causes leprosy (Hansen's disease). Moving them spreads this risk to new ecosystems and human populations.
- Ecological Disruption: Relocated armadillos rarely survive due to territorial disputes with established populations, and moving them simply transfers the nuisance problem to a neighbor.
If you trap an armadillo, consult your state's Department of Natural Resources or a licensed wildlife removal professional for legal euthanasia or disposal protocols. Always wear thick leather gloves and a mask when handling traps or deceased armadillos to minimize zoonotic disease exposure.
Frequently Asked Questions
Do mothballs work to repel armadillos?
No. Mothballs contain naphthalene or paradichlorobenzene, which are highly toxic to the environment, pets, and children. Furthermore, using mothballs outdoors as a pesticide is a violation of federal EPA regulations. The concentration of fumes required to deter an armadillo in an open yard is physically impossible to achieve before the chemicals dissipate or wash into the groundwater.
Will cayenne pepper or predator urine stop them?
Cayenne pepper sprays and coyote urine offer only a temporary, superficial deterrent. Armadillos forage with their snouts buried in the dirt; surface-level spicy powders wash away after a single dew cycle or light rain. While coyote urine may cause a brief hesitation, a hungry armadillo will quickly realize there is no actual predator present and resume digging.
Can I just fill in their burrows to make them leave?
Simply filling an active burrow with dirt will not solve the problem. The armadillo will either dig it back out from the inside or excavate a new tunnel three feet away. To properly close a burrow, you must first ensure it is empty (use live traps or wait until dusk when they are foraging), then pack the tunnel tightly with a mixture of soil and crushed gravel, and lay a piece of chicken wire flat over the entrance before covering it with topsoil and sod.
