Opossums are one of the most misunderstood animals that San Antonio homeowners encounter. People aren’t sure whether they’re dangerous, whether they carry rabies, whether they’re doing any harm at all — or whether they should simply be left alone. The answer depends on where the opossum is and what it’s doing. An opossum passing through your yard on a Tuesday night is a very different situation from one that has set up a nest under your porch, in your crawl space, or inside your attic. This guide covers what you actually need to know about opossum removal in San Antonio — their behavior, the real risks they pose, what they’re good for, and when to call a professional.
What Is an Opossum?
The Virginia opossum — almost universally called a “possum” in Texas — is the only marsupial native to North America. Like kangaroos and koalas, opossums carry and nurse their young in a pouch. They’re roughly the size of a house cat, with coarse gray fur, a naked pink tail, a pointed white face, and 50 teeth — more than any other North American land mammal. That wide-mouthed hiss they produce when threatened is a defensive display, not an attack. Despite their menacing appearance when cornered, opossums are generally passive animals that would rather flee or play dead than fight.
In San Antonio and the Texas Hill Country, opossums are abundant year-round. They thrive in the same suburban and semi-rural environments where humans live — wooded lots, neighborhoods near creek beds, properties with dense ground cover, and anywhere with reliable food and water sources. They’re highly adaptable opportunists, which is both what makes them ecologically useful and what brings them into conflict with homeowners.
What Are Opossums Good For?
This is a legitimate question worth answering honestly, because the answer affects how homeowners should think about opossums on their property. Opossums do provide genuine ecological benefits. They eat ticks — studies have estimated that a single opossum may kill thousands of ticks per season as they groom themselves — which is meaningful in a region where tick-borne illness is a real concern. They also eat cockroaches, rats, mice, snails, slugs, overripe fruit, and carrion, functioning as a natural cleanup crew for the environments they inhabit.
Opossums are also naturally resistant to most snake venoms, including that of rattlesnakes and copperheads native to the Hill Country, and they eat snakes when given the opportunity. And unlike raccoons, skunks, and foxes, opossums almost never carry rabies — their low body temperature makes it very difficult for the rabies virus to survive in their system.
So if you see an opossum in your yard at night, moving through without establishing a home base, the honest answer is that it’s probably doing more good than harm. The calculation changes when an opossum moves in — under a porch, into a crawl space, or into your attic. At that point, the same animal that was a net positive in your yard becomes a source of odor, structural damage, and health risk inside your home.
Where Do Opossums Nest and Hide During the Day?
Opossums are strictly nocturnal and spend their days tucked into dark, sheltered spaces. Unlike some wildlife that constructs elaborate nests, opossums are opportunistic nesters — they use whatever shelter is available rather than building their own. Common daytime hiding spots on residential properties include under decks and porches, inside crawl spaces, in dense brush piles or log stacks, in hollow trees or stumps, and — particularly in colder weather — inside attics and wall voids.
They don’t dig their own burrows but will readily occupy abandoned armadillo holes, which are common throughout the Hill Country. On properties with raised foundation structures, a gap in the skirting or lattice around a porch is often all the invitation an opossum needs. Once inside a crawl space or under a deck, they may establish a den site and return repeatedly, particularly if a female is raising young.
The Problems Opossums Cause Inside and Under Structures
An opossum denning under your home or inside your attic creates several problems that compound over time. The most immediate is odor. Opossum urine and feces have a strong, persistent smell that can penetrate into living areas — particularly from crawl spaces and attics with limited ventilation. Unlike some wildlife that establishes a single latrine area, opossums tend to defecate throughout their living space, which means contamination spreads across the full extent of wherever they’re nesting.
Opossum droppings can harbor Salmonella and leptospirosis — a bacterial disease transmissible to humans and pets through contact with contaminated soil, water, or surfaces. Their urine can also attract other wildlife, including rats, that follow scent trails into a structure. Our health risks page covers the disease concerns associated with wildlife in the home in more detail.
Structural damage from opossums is typically less severe than from raccoons but still meaningful. They tear up insulation for nesting material, leave soiled areas that require remediation, and can damage vapor barriers in crawl spaces. Opossums may also carry fleas and mites that can spread to pets and into living areas once the animal is present inside a structure.
A female opossum with young is a more complex situation. Opossums have two breeding seasons per year in Texas — typically January through February and again in June through July — and litters average seven to nine young. Young opossums ride on their mother’s back after leaving the pouch and may scatter if the mother is disturbed, creating a difficult-to-resolve infestation if the situation isn’t handled carefully by a professional.
Do Opossums Threaten Pets or Chickens?
Opossums are not typically aggressive toward dogs and cats, though a cornered opossum will hiss, bare its teeth, and occasionally bite if it has no escape route. Small cats may be at minor risk, but most encounters between opossums and household pets are standoffs rather than attacks. The more significant concern is disease transmission — dogs and cats that come into contact with opossum droppings or urine are at indirect risk for leptospirosis and internal parasites.
Backyard chickens are a different matter. Opossums will raid chicken coops for eggs and will kill chickens, particularly in situations where the birds are confined and cannot escape. They are less powerful and efficient as hunters than foxes or raccoons but will take advantage of an easy opportunity. If you’re losing eggs or finding dead birds with bites to the head and neck, an opossum is among the likely suspects along with raccoons and foxes.
How to Tell an Opossum Is on Your Property
Opossum tracks are distinctive — their rear feet show an opposable “thumb” that leaves a splayed, hand-like print easily distinguishable from raccoon, cat, or rodent tracks. Droppings are roughly one to two inches long and rounded on the ends, similar to cat feces but typically deposited in multiple spots rather than in a single location. You may also notice disturbed garbage, toppled compost bins, missing pet food left outdoors, or — under porches and decks — compressed nesting material along with the characteristic ammonia odor of accumulated urine.
Because opossums are nocturnal, most sightings happen at dusk or in the beam of a flashlight or motion-activated security light. If you’re regularly seeing an opossum in the same location on your property, it has established a den site nearby and will not move on without intervention.
When to Call a Professional
A transient opossum passing through your yard does not require professional intervention. A denning opossum inside or under a structure does. The distinction is simple: if you’re seeing the same animal in the same location repeatedly, smelling opossum odor from a crawl space or attic, finding evidence of a nest, or losing chickens or eggs to a raider, it’s time to call for help.
Varmint Masters handles opossum removal throughout San Antonio and the Texas Hill Country — trapping, exclusion, and the repair work that keeps new animals from moving into the same entry points. If remediation is needed after an attic or crawl space infestation, our insulation services handle soiled material removal and replacement. Contact us to schedule an inspection.
Opossum FAQs for San Antonio Homeowners
Do opossums carry rabies?
Opossums very rarely carry or transmit rabies. Their lower body temperature — significantly below that of most mammals — makes it difficult for the rabies virus to survive and replicate in their system. Of all the wildlife species commonly encountered in San Antonio, opossums represent one of the lowest rabies risks. That said, any wild animal that is acting erratically or approaching humans without fear should be treated with caution and reported to animal control.
What are opossums good for?
Quite a lot, ecologically speaking. Opossums eat ticks in significant quantities — potentially thousands per season — along with cockroaches, rats, mice, snails, and carrion. They are naturally resistant to most snake venoms and eat snakes when the opportunity presents itself. A transient opossum moving through a yard is generally doing more good than harm. The benefit calculation changes when an opossum establishes a den inside or under a structure.
Where do opossums nest?
Opossums are opportunistic nesters that use whatever shelter is available rather than building their own. Common den sites on residential properties include under decks and porches, inside crawl spaces, in brush piles and log stacks, in hollow trees, and inside attics accessed through open vents or damaged soffits. They readily use abandoned armadillo burrows, which are common throughout the Hill Country. They return to the same den site repeatedly once established.
Where do opossums hide during the day?
Opossums are strictly nocturnal and spend daylight hours in dark, sheltered locations. On residential properties this typically means under decks, inside crawl spaces, in dense ground cover, in hollow trees, or inside attic spaces. They are rarely seen during the day under normal circumstances — a daytime opossum sighting, particularly if the animal appears disoriented or is moving in the open, may indicate illness.
How many babies do opossums have?
Opossums have large litters — an average of seven to nine young per litter, with as many as thirteen possible. In Texas, they breed twice per year, typically in January through February and again in June through July. Young are born extremely undeveloped and crawl into the mother’s pouch, where they nurse for approximately two months. After leaving the pouch, the young ride on the mother’s back for several more weeks before becoming independent.
Are opossums dangerous to dogs and cats?
Opossums are not typically aggressive toward dogs and cats. Their primary defense is the hiss-and-bare-teeth display, followed by playing dead — not attack. That said, a cornered opossum will bite, and bites from any wild animal warrant veterinary attention. The more meaningful risk is indirect: dogs and cats that come into contact with opossum droppings or urine are at risk for leptospirosis and internal parasites even without direct contact with the animal.
Will opossums kill chickens?
Yes. Opossums will raid chicken coops for eggs and will kill chickens, particularly confined birds that cannot escape. They are less powerful hunters than foxes or raccoons but will take advantage of easy access. Signs of an opossum raid typically include missing eggs, dead birds with bites concentrated on the head and neck, and evidence of entry through a gap smaller than many homeowners would expect — opossums can squeeze through surprisingly small openings.
How do I get an opossum out from under my porch?
The safest and most permanent approach is professional trapping followed by exclusion — sealing the entry points under the deck or porch with hardware cloth or other appropriate materials so that new animals cannot move in after removal. DIY trapping is legally permissible in Texas for opossums but requires proper trap placement, handling precautions, and knowledge of where to relocate the animal. Incomplete exclusion is the primary reason opossum problems recur. Our repair and exclusion services address both steps as part of a complete job.
Is it legal to remove opossums in Texas?
Yes. Opossums are classified as a non-game species in Texas and can be legally trapped and relocated by property owners and licensed professionals. There are no seasonal restrictions on opossum removal, unlike bats, which have a protected maternity window. Professional removal is recommended over DIY in situations where young may be present, where the animal is inside a structure rather than under an outdoor deck, or where exclusion work is needed to make the solution permanent.
What do opossums eat?
Opossums are true omnivores with a remarkably broad diet. They eat insects, ticks, cockroaches, snails, and slugs; rodents, snakes, frogs, and birds when they can catch them; fruit, berries, and vegetables; pet food left outdoors; garbage; and carrion. This dietary flexibility is a large part of what makes them so adaptable to suburban environments — they can find food almost anywhere humans live. It also means that eliminating food sources is an effective deterrent for opossums that haven’t yet established a den on your property.
Why is an opossum playing dead?
“Playing possum” is an involuntary physiological response to extreme stress, not a conscious decision. When threatened beyond a certain threshold, opossums fall into a catatonic state — lying on their side, mouth open, tongue out, producing a foul-smelling secretion — that can last from a few minutes to several hours. Predators that prefer live prey typically lose interest and move on. This is one of the opossum’s primary survival mechanisms and one reason they’ve persisted as a species. An opossum in this state is not dead and should not be handled.
How do I keep opossums out of my yard?
The most effective deterrents are eliminating food sources and sealing potential den sites. Secure garbage cans with bungee cords or locking lids, bring in outdoor pet food bowls at night, pick up fallen fruit, and keep compost bins secured. Seal gaps under porches and decks with hardware cloth before an opossum moves in — it’s considerably easier to exclude them than to remove them after they’ve established a nest. Motion-activated lights and sprinklers provide some deterrence but are unreliable against opossums that have found a reliable food source.
Do opossums dig holes in yards?
Opossums do not typically dig their own burrows — they’re borrowers rather than excavators. They will readily occupy existing holes, particularly abandoned armadillo burrows, which are abundant in Hill Country properties. If you’re finding new holes in your yard, armadillos are a more likely culprit than opossums. Our armadillo removal page covers that specific problem in more detail.
What does opossum feces look like?
Opossum droppings are roughly one to two inches in length, tapered or rounded at the ends, and typically dark brown to black. They resemble large cat feces and are often found scattered throughout a denning area rather than deposited in a single latrine location. Fresh droppings have a distinct unpleasant odor. If you’re finding droppings in a crawl space or attic, they should be treated as a biohazard — avoid direct contact and wear respiratory protection before entering the space.
Does Varmint Masters handle opossum removal throughout the Hill Country?
Yes. Varmint Masters provides opossum removal services throughout San Antonio and the surrounding Hill Country, including Boerne, Bulverde, Stone Oak, Helotes, Spring Branch, and surrounding communities. Whether you have an opossum under your porch, in your crawl space, or inside your attic, we handle the full job — removal, exclusion, and remediation if needed. Contact us to schedule an inspection.
