Trapping and relocating Rabies Vector Species (Raccoons, Skunks, Foxes) across county borders or beyond state-mandated limits (often 5–10 miles) is an illegal misdemeanor in most US states due to disease quarantine protocols.
To keep opossums off your property humanely: eliminate outdoor food sources (bring pet food inside before dark, secure garbage cans with bungee cords, and clean up fallen tree fruit), install motion-activated floodlights or water sprinklers around dark corners, and trench 1/2-inch wire mesh around deck skirts and sheds. Do not panic or kill them — opossums rarely carry rabies due to low body temperature, are non-aggressive, and consume thousands of pest ticks and garden slugs each season.
🎯 Repellent Efficacy Ratings
Virginia opossums are North America’s only native marsupials and naturally suppress tick populations while possessing near-total immunity to rabies due to low body temperature. Trapping and relocating opossums off-property is restricted by state wildlife codes. Exclusion from decks and attics must preserve mother-joey pairs; prioritize foundation skirting and pet food sanitation.
Encountering a Virginia opossum (Didelphis virginiana) in the beam of your flashlight as it hisses, bares a mouthful of 50 sharp teeth, and sways back and forth can be a startling backyard experience.
Despite their fierce defensive display, North America’s only native marsupials are gentle, non-aggressive nomadic wanderers. Opossums do not defend territories or dig destructive burrows. Instead, they act as nature’s sanitation workers — grooming off and devouring thousands of Lyme disease-carrying blacklegged ticks, cleaning up rotting windfall fruit, and eating venomous snakes (they possess natural peptide immunity to pit viper venom). However, when opossums take up residence beneath decks or rummage through garbage, simple humane exclusion resolves the conflict permanently.
Unlike raccoons, skunks, and bats, opossums have an unusually low baseline body temperature (94°F to 97°F / 34°C to 36°C). This low core temperature creates a hostile environment that makes it nearly impossible for the rabies virus to incubate and survive in their bloodstream. An open-mouthed hissing opossum is putting on an elaborate fear bluff — not displaying signs of rabies.
Why Opossums Visit Your Yard (Root Causes)
Kibble left on porches offers calorie-dense protein that nocturnal opportunists can smell from hundreds of yards away.
Loose garbage can lids, open compost heaps, and grease trays beneath backyard barbecue grills provide effortless meals.
Overripe windfall apples, figs, persimmons, and sunflower seed scatter beneath bird feeders create natural foraging stations.
Dark, dry cavities under porches, crawlspaces, and woodpiles offer safe daytime resting dens away from dogs and coyotes.
Opossum Deterrents Ranked by Evidence
Step-by-Step Humane Opossum Exclusion Plan
Step 1 — Eliminate Nocturnal Food Attractants
Opossums have large home ranges and are strictly nomadic; if your yard provides zero edible rewards, they will move on within 24 to 48 hours.
- Bring dog, cat, and chicken food bowls indoors at least 1 hour before sunset.
- Fasten outdoor trash can lids using heavy-duty rubber bungee cords or store bins inside a secured garage or shed.
- Rake up fallen fruit (apples, pears, berries) from underneath orchard trees daily.
- Clean grease drip pans beneath outdoor gas and charcoal barbecue grills after every cooking session.
Step 2 — Trench and Skirt Decks, Porches, and Sheds
Opossums do not dig their own burrows, but readily occupy existing openings under low-clearance residential structures.
- Fasten 1/2-inch 16-gauge galvanized hardware cloth mesh to the bottom wooden framing of your deck or shed.
- Bury the wire into a 12-inch vertical trench with an outward 6-inch horizontal bend before backfilling with dirt and crushed gravel.
- Before permanently sealing any opening, verify the den is empty: sprinkle a smooth 1-inch layer of flour or builder’s sand in front of the hole and check for outgoing tracks after dark.
- Alternatively, install a temporary one-way exclusion door (spring-loaded wire flap) for 3 to 4 nights to allow animals to leave without re-entering.
Step 3 — Deploy Motion-Activated Startle Deterrents
Opossums are timid, slow-moving animals with poor eyesight and sensitive nocturnal hearing.
- Mount motion-activated infrared LED floodlights aimed at fence lines, compost bins, and patio perimeters. Sudden illumination makes opossums feel exposed to predators.
- Install motion-activated water sprinklers (e.g., Orbit Yard Enforcer) near garden beds. The sudden burst of pressurized cold water harmlessly startles them away.
- Place an outdoor battery-powered radio tuned to a talk station near crawlspace entry points for 2 to 3 nights; human voices convince the animal the den is unsafe.
Step 4 — Understand Breeding Season & Wildlife Help
Female opossums carry their litters in external abdominal pouches (marsupiums) from March through August.
- Never seal crawlspaces during spring and early summer without confirming there are no dependent joeys inside.
- If an injured opossum or orphaned pouch babies (under 7 inches long from nose to rump) are found on your property, place them in a quiet, dark cardboard box lined with a towel.
- Contact a licensed local wildlife rehabilitator (find directory via Animal Help Now at ahnow.org or your state wildlife agency).
Bring pet bowls inside before dusk and secure trash can lids with heavy bungee cords.
Deploy motion-activated floodlights and water sprinklers to startle nocturnal visitors.
Trench 1/2-inch galvanized wire mesh 12 inches deep around deck and shed perimeters.
Contact licensed wildlife rehabilitators if orphaned pouch young or injured animals are found.
Myths vs. Facts About Opossums
Hissing and drooling is an involuntary defensive bluff. Opossums almost never carry rabies due to low body temperature (94–97°F). If pressed further, they collapse into a catatonic faint (‘playing possum’).
Opossums are fastidious groomers. Ecological research shows a single adult opossum can groom and ingest up to 5,000 blacklegged ticks in a single season, stopping Lyme disease transmission.
Opossums possess non-retractile claws suited for climbing trees, not excavating soil. Lawn holes are caused by armadillos, skunks, or groundhogs; opossums simply take shelter in existing cavities.
Opossums produce a blood serum protein that neutralizes pit viper venom. They actively hunt and eat venomous copperheads and rattlesnakes around properties without ill effects.
Frequently Asked Questions
Are opossums dangerous to house cats or small dogs?
No. Opossums are slow, timid foragers that actively avoid conflict. In the vast majority of yard encounters, the opossum will attempt to escape, hiss as a bluff, or play dead. Fights only occur if a dog attacks and corners the animal.
What does an opossum do when it ‘plays possum’?
Thanatosis (playing dead) is an involuntary, comatose physiological response triggered by extreme stress. The opossum’s heart rate drops, its body goes stiff, its eyes glaze over, and its anal glands secrete a foul green mucus that smells like rotting meat, convincing predators the animal is already decomposed.
Can I relocate an opossum trapped in a cage trap?
Check state wildlife regulations before trapping. In many states (such as California, New York, and North Carolina), it is illegal to relocate wildlife away from their home property because relocated animals suffer high mortality and spread infectious diseases. Humane exclusion is vastly superior.
What should I do if an opossum is stuck inside my garbage can?
Do not hurt the animal. Simply tip the trash can gently onto its side and walk away. Because opossums are nocturnal, the animal will calmly waddle out and return to the woods as soon as darkness falls.
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- 1. National Opossum Society (NOS): Virginia Opossum (Didelphis virginiana) Biology, Ecology, and Low Rabies Incidence.
- 2. Cary Institute of Ecosystem Studies: The Role of Opossums in Regulating Blacklegged Tick Populations and Lyme Disease Ecology.
- 3. Humane Society of the United States (HSUS): Humane Eviction and Exclusion Guidelines for Opossums Under Porches and Sheds.
- 4. University of Florida Wildlife Extension (IFAS): Managing Nuisance Wildlife: The Ecological Value and Exclusion of Opossums. Publication WEC-209.
- 5. Texas Parks & Wildlife Department (TPWD): Virginia Opossum: Habitat, Thanatosis Behavior, and Urban Coexistence.
HowToRepel.com is an independent educational resource — not a licensed pest control operator. While we consult peer-reviewed entomological studies, EPA documentation, and university extension research, always follow manufacturer EPA label instructions on commercial products or consult a licensed pest control operator for severe structural infestations. Read our full Safety & Content Disclaimer →
Pest Defense Fast Facts (2026 Updated)
- Biological Indicators: Always identify the pest’s reproductive cycle and morphological traits (e.g., adult vs. larval stage) before treating.
- Active Ingredients: Non-toxic options like amorphous silica (diatomaceous earth) and specific essential oil concentrations can disrupt the exoskeleton without harsh chemicals.
- Structural Exclusion: The gold standard for prevention is a physical barrier. Use 1/4-inch galvanized mesh, copper wire mesh, and elastomeric silicone sealant.
- Safety & Regulatory: Verify EPA registration numbers and wear appropriate PPE (N95 mask, nitrile gloves) during application. Always check pet toxicity thresholds.
- Economics: DIY eradication typically costs $15–$50, whereas professional structural remediation ranges from $250 to $900 depending on the severity of the infestation.
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