Can You Own a Boa Constrictor in Wisconsin? What the Law Actually Says
September 18, 2026
Wisconsin has no state law banning boa constrictors, yet a snake that’s perfectly legal in one town can get its owner cited two miles down the road. If you’re trying to figure out whether you can own a boa constrictor in Wisconsin, the honest answer is that it depends on your zip code almost as much as it depends on state statute. This guide breaks down what federal law says, what Wisconsin’s captive wildlife statute actually requires, and where local ordinances create real risk for boa owners.
Wisconsin’s reputation as a relatively permissive state for exotic pets makes it tempting to assume a boa is an easy yes everywhere. But that permissiveness mostly exists at the state level. Cities, villages, and counties fill in the gaps with their own rules, and some of them ban constrictors outright.
Is It Legal to Own a Boa Constrictor in Wisconsin
At the state level, yes. While there is no statewide ban on exotics, some municipalities have passed legislation on their own to ban certain types of animals within their borders. That single fact shapes almost everything else in this guide, because it means the real legal risk for boa owners in Wisconsin lives at the local level, not the state level.
The boa constrictor (Boa constrictor) is a large, heavy-bodied snake native to Central and South America that has become one of the most commonly kept large snakes in the American pet trade. Anacondas and pythons can reach lengths of 20 feet or more, while the boa grows to about 13 feet in length. That size is exactly why so many local governments single boas out alongside pythons when writing exotic-animal ordinances.
Wisconsin’s hands-off approach to exotic pets has drawn criticism from animal welfare groups. Debbie Leahy of the Humane Society of the United States put it bluntly when discussing the state’s rules, noting that “in some cases, it’s easier to own a tiger than a dog.” A boa constrictor falls into that same lightly regulated category at the state level. For a closer look at the species itself, including care and behavior details, see this boa constrictor species profile.
Federal Restrictions on Boa Constrictors
Federal law adds a layer that many prospective owners overlook. The U.S. Fish and Wildlife Service can list species as injurious wildlife under the Lacey Act, and the Fish and Wildlife Service declared nonnative constrictor snakes as injurious species under the Lacey Act, meaning injurious species cannot be imported or transported over state lines without FWS-issued permits. That sounds alarming for boa owners, but the boa constrictor’s actual status under this rule is more favorable than most people assume.
In 2010, the Fish and Wildlife Service proposed listing nine large constrictor species as injurious, and the proposed rule would have added Python molurus, reticulated python, Northern African python, Southern African python, boa constrictor, yellow anaconda, DeSchauensee’s anaconda, green anaconda, and Beni anaconda as injurious reptiles under the Lacey Act. The boa constrictor was on that original list from the very start.
The first round of listings came in January 2012, and the Service added Python molurus, Northern African python, Southern African python, and yellow anaconda to the list of injurious reptiles, prohibiting their importation and interstate transportation except by permit for zoological, education, medical, or scientific purposes. Notice what’s missing from that list: the boa constrictor was not included.
A second round followed in March 2015, and this time the new regulation listed the reticulated python, DeSchauensee’s anaconda, green anaconda, and Beni anaconda as injurious under the Lacey Act, and removed the boa constrictor from consideration. The Fish and Wildlife Service explained why in its official Q&A on the final rule, noting the boa constrictor was the only one of the nine species initially proposed that was withdrawn from consideration because the regulatory prohibitions of the Lacey Act are less effective when a species is widely held in captivity in high numbers and significant domestic breeding is occurring.
Important Note: Unlike Burmese pythons, African pythons, yellow anacondas, and reticulated pythons, the boa constrictor is not currently listed as an injurious species under the Lacey Act. That means there’s no federal ban on importing or transporting boas across state lines, though the U.S. Fish and Wildlife Service and pet industry groups have discussed voluntary measures to prevent boas from being released into the wild, according to The Wildlife Society.
Reptile advocacy groups tracked this rulemaking closely for years. You can read the full regulatory history in the Federal Register’s 2015 final rule, or review the industry breakdown from the United States Association of Reptile Keepers.
Wisconsin’s Laws on Owning a Boa Constrictor
Wisconsin’s primary captive wildlife framework lives in Chapter 169 of the state statutes. Under that chapter, Wisconsin wildlife laws require a license to take a wild animal from the wild or to import one into the state, and a license is also required to exhibit, breed, rehabilitate, hunt, and purchase wild animals. Violations can result in fines, forfeiture, and imprisonment.
That statute sounds like it would cover boa constrictors directly, but in practice it’s aimed more at wild-caught and native wildlife than at captive-bred pet-trade snakes. Non-native reptiles such as ball pythons, corn snakes, and bearded dragons commonly sold in pet stores fall under the broader captive wildlife regulations but do not require a DNR license when sourced legally from captive breeders. Boa constrictors, which are bred in captivity by the millions across the pet trade, generally fall into this same category at the state level.
The picture changes for native reptiles, which Wisconsin protects far more tightly than exotic pet-trade snakes. Collection of protected wild animals, including gray rat snake, gopher snake, timber rattlesnake, and North American racer, or those listed as endangered or threatened, is prohibited in Wisconsin. If you’re curious how this native-versus-nonnative distinction plays out with other snake species, the guide on whether coral snakes exist in Wisconsin covers similar territory.
Journalists covering this topic have consistently found the same pattern. Wisconsin allows residents to keep almost any animal they want as a pet, making it a magnet for wild animals. You can read the full investigative background from Wisconsin Watch, and the underlying statute itself is summarized by the Animal Legal & Historical Center.
Permits and Requirements for Boa Constrictor Ownership in Wisconsin
Because most captive-bred boas skip the state DNR licensing requirement, the permits that actually matter for boa owners tend to come from the county or municipal level. These local permit systems vary enormously in how they’re structured, what they require, and how strictly they’re enforced.
Sauk County offers a clear example of how this works in practice. Under its Animal Control Ordinance, constrictor snakes over 3 feet in length fall under the county’s regulated animal list, and anyone considering or already owning an animal fitting that description must contact the public health department to obtain a permit. A typical adult boa constrictor clears that 3-foot threshold within its first year, so this rule applies to nearly every boa kept long-term in the county.
Model town ordinances used across Wisconsin follow a similar structure. A standard application typically asks for:
- The applicant’s full name and any agent handling the animal on their behalf
- A description of the species being kept, since Reptilia over a minimum specified length, including boa constrictors, pythons, and any other snakes, are subject to regulation.
- Documentation of enclosure security and housing conditions
- Contact information for emergency response if the animal escapes
Some Wisconsin permit systems mirror the licensing structure used for other DNR-regulated activities, where a license authorizes specific conduct within defined limits, similar in spirit to how the state manages trout fishing season permits. The comparison only goes so far, since captive wildlife permits are usually issued by county health departments rather than the DNR itself, but the underlying idea, that you need paperwork before the activity is legal, holds true either way.
Pro Tip: Before buying a boa constrictor, call your county’s public health or animal control department directly. Many ordinances aren’t published online, and as one Wisconsin herpetological resource puts it, “always contact your local clerk’s office directly before assuming ownership is permitted in your area.”
Local Ordinances That May Apply in Wisconsin
This is where boa ownership in Wisconsin gets genuinely complicated. The variation across Wisconsin municipalities is striking, and neighboring towns can have completely different rules for the exact same snake.
Janesville represents the strictest end of the spectrum. The city’s ordinance prohibits any wild, exotic, and/or vicious pets including raccoons, any pigs, and poisonous or constricting snakes such as pythons or boas, which means a boa is banned outright regardless of size or how it was acquired. Other municipalities take a size-based or family-based approach instead of a blanket ban.
| Municipality | How Boa Constrictors Are Treated |
|---|---|
| Janesville (City) | Constricting snakes such as boas banned outright |
| Bellevue (Village) | Family Boidae, which includes pythons and boa constrictors, prohibited |
| Ledgeview (Town) | Boas and pythons exceeding 8 feet prohibited |
| Ashwaubenon (Village) | Boidae species whose adult length may exceed 8 feet prohibited |
| Hobart (Village) | All constrictor snakes prohibited, with limited exceptions |
| De Pere (City) | Snakes not indigenous to Wisconsin or exceeding 3 feet prohibited |
| Sauk County | Permit required for constrictor snakes over 3 feet |
Bellevue prohibits crocodilians, venomous reptiles, monitor lizards over 2 feet, green and rock iguanas, and family Boidae, meaning pythons and boa constrictors, outright. Ashwaubenon similarly targets family Boidae, restricting all species whose adult length may exceed eight feet. Since adult boas routinely exceed that length, both ordinances function as effective bans on the species within their borders.
These local rules almost always sit alongside separate protections for native wildlife, which follow a different legal track entirely. Native species such as hawks, owls, herons, and blackbirds can’t be kept as pets under state and federal wildlife statutes regardless of what a city’s exotic-pet ordinance says, and the same is true for common backyard mammals like squirrels. If you want to see how that native-species framework plays out in more detail, the guides on Wisconsin hawks and Wisconsin squirrels both cover animals that stay off-limits no matter how permissive a city’s exotic-pet code is. For a side-by-side look at how venomous species get treated under similar municipal codes, see this breakdown of venomous animals in Wisconsin.
Wisconsin’s approach to regulating specific animals at the local level isn’t unique to reptiles, either. Breed-specific rules for dogs follow a comparable pattern of state permissiveness paired with strict city-by-city variation, as covered in this guide to pit bull laws in Wisconsin.
Common Mistake: Assuming that a boa’s legal status under state law automatically applies everywhere in Wisconsin. City and county governments regularly pass stricter rules that override the state’s more permissive baseline.
For a comprehensive listing of ordinances by municipality, the Madison Area Herpetological Society maintains a detailed reptile and amphibian ordinance listing, and the state provides a model framework in its own harmful and exotic wild animal ordinance template that many towns adapt for local use.
Penalties for Illegally Owning a Boa Constrictor in Wisconsin
Penalties for keeping a boa constrictor unlawfully in Wisconsin depend heavily on which level of government is doing the enforcing. At the state level, violations of the captive wildlife statute follow the same structure as other wildlife licensing offenses: violations can result in fines, forfeiture, and imprisonment.
At the local level, enforcement usually looks different and often more immediate. Cities like Janesville can issue citations or require animal surrender for keeping a python or boa within city limits where local ordinance bans it outright, independent of what state or federal law allows. That means you could own a boa entirely within the bounds of state and federal law and still lose the animal, or face a citation, simply because of where you live.
Enforcement gets more complicated when a boa escapes or gets abandoned, and Wisconsin has already seen this play out. In one widely reported case, a sheriff’s office in Richland County responded to reports of a boa constrictor crossing a road, and the sheriff’s captain admitted his officers wouldn’t touch it because they were skittish around snakes. A local exotic pet store owner ended up corralling the snake himself and suspected the docile animal had probably been someone’s escaped or abandoned pet. Cases like this often lead animal control officers to treat nuisance-animal complaints the same way they’d treat any escaped pet, a pattern also seen in disputes covered in this guide to handling a neighbor’s animal wandering onto your property.
To stay on the right side of the law with a pet boa constrictor in Wisconsin, work through these steps before you buy or bring one home:
- Confirm there’s no state-level restriction, which there generally isn’t for captive-bred boas
- Check your county’s animal control or public health ordinance for size-based permit triggers
- Check your specific city or village code, since some ban constrictors outright regardless of county rules
- Apply for any required permit before acquiring the animal, not after
- Keep purchase records and enclosure documentation in case a permit review comes up later
Because Wisconsin’s rules shift from one municipal line to the next, the safest approach is always to verify current ordinance status with your specific city, village, or county office rather than relying on what a neighboring town allows.