Bat Removal Laws in Montana: A Homeowner’s Guide to Legal Exclusion

Finding a bat clinging to your curtains or hearing scratching in the attic at dusk is unsettling, but reaching for a broom, a can of pesticide, or a shop vacuum is the wrong move. Bat removal laws in Montana treat every bat species in the state as protected wildlife, which means the method you choose, and the time of year you choose it, carries real legal weight. Before you call an exterminator or attempt exclusion yourself, it helps to know exactly what state and federal rules allow.

Montana is home to 15 different species of bats, and these animals do far more good than harm for the state’s farms and gardens. Yet many homeowners still default to lethal methods that are flatly illegal. This guide walks through protection status, legal exclusion windows, approved removal methods, permit requirements, and the penalties you could face for handling a bat problem the wrong way.

Are Bats a Protected Species in Montana

Bats in Montana fall under the Nongame and Endangered Species Conservation Act, the Montana statute known by its popular title and cited as MCA 87-5-101 to 87-5-132. Montana Fish, Wildlife and Parks (FWP) oversees this framework, and a 1973 law clarified FWP’s responsibility to manage all wildlife, including nongame species, which the statute defines broadly to cover any wild mammal not otherwise legally classified. Bats fall squarely into that nongame category alongside hundreds of other native species that aren’t hunted as big game or furbearers, a distinction worth understanding if you’re also familiar with hunting laws in Montana that apply to regulated game species.

Montana’s bat roster includes everything from the tiny western small-footed myotis to species like the little brown myotis, or Myotis lucifugus, one of the most common colonizing bats found in attics statewide. Two-thirds of these species face a growing threat: two-thirds of Montana’s bat species may be vulnerable to population impacts from white-nose syndrome, a disease that has devastated bat colonies across the country. Because of this, FWP actively tracks bat populations and roost sites as part of its conservation work.

Bats also carry a separate legal designation that surprises many homeowners. Montana’s Department of Livestock classifies bats as a rabies vector species alongside foxes, skunks, raccoons, and groundhogs, and a person may not possess a rabies vector wild animal unless narrow exceptions apply, such as possessing it for at least six months prior to January 1, 1982, or using it in a fur-bearing enterprise, zoological exhibition, or for scientific research at an educational institution. In practice, this means you cannot legally keep, cage, or relocate a bat yourself outside of an authorized exclusion process.

Key Insight: Bat protection in Montana comes from two directions at once: wildlife conservation law that limits how you can take or harm bats, and public health regulation that restricts who can possess them. Both apply at the same time.

Is It Legal to Remove Bats From Your Home in Montana

Yes, removing bats from a Montana home is legal, but only through non-lethal exclusion. Wildlife control professionals serving the state are direct about this limitation: you cannot harm, kill, or poison bats, since lethal methods are illegal and can result in fines, making exclusion the only legal removal method. That single rule shapes every other decision you’ll make about a bat problem.

Conservation groups working in the state echo the same standard. Bat Conservation International, cited by Teller Wildlife Refuge, notes that removing a single bat or a colony of bats can be done safely and humanely when handled correctly. The same source advises that before attempting to relocate a bat colony, it is best to check with Montana Fish, Wildlife and Parks, since staff there can sometimes assist directly or point you toward a compliant process.

This legal standard mirrors what you’ll find if you compare notes with neighboring jurisdictions. States such as Minnesota’s wildlife removal laws and North Carolina’s wildlife removal laws apply similarly strict exclusion-only rules for bats, reflecting a national consensus that lethal bat control does more ecological harm than good.

Bat Exclusion Season and Restricted Dates in Montana

Timing is the single most important factor in a legal bat removal. Montana State University’s Extension office explains that most bat species leave in winter, permitting exclusion in their absence. That makes late fall through winter one of the safest windows for a permanent fix, since the roost is typically empty.

If you don’t want to wait for winter, there’s still a legal path. According to MSU Extension, there is a relatively simple exclusion technique that can be used after young are flying but prior to the winter months. That narrow window, generally late summer, avoids trapping flightless pups inside a sealed structure.

National industry guidance backs up this seasonal logic. Pest Control Technology magazine notes that in most states, regulators allow bat-proofing and bat removal beginning sometime from early August to late August and continuing until females start caring for young again in early spring. The same source cautions that during spring and early summer, a colony might contain a large number of baby bats that are too young to fly or fend for themselves, which is exactly why exclusion during that period is prohibited. Some states also prohibit, or at least recommend against, winter bat-proofing from November through March because certain species, particularly the big brown bat, may return to hibernate in the same structure.

Important Note: Montana does not publish a single fixed statutory calendar for bat exclusion the way some states do. Because timing depends on species, elevation, and current weather patterns, contact Montana FWP or MSU Extension directly before scheduling exclusion work, especially if you’re unsure whether young bats are still present in the roost.

Approved Bat Removal Methods in Montana

Every legal bat removal method in Montana relies on the same basic principle: let the bats leave on their own, then prevent them from getting back in. MSU Extension describes a straightforward DIY approach using netting, where inexpensive light-weight polypropylene netting with a mesh-size of 1/4-inch or smaller is hung above bat exit holes, extending at least two feet below and to the side of exit points, so bats can emerge but later find themselves unable to return. A sheet of heavy clear plastic works the same way as a lower-cost alternative.

Professional installers typically use a more permanent device instead. Bat exclusion specialists describe one-way doors, sometimes called bat valves, which permit bats to exit the building but not re-enter, an approach that is humane and effective and often does not require any personal handling of bats by hand. These devices come in several designs matched to common entry points around rooflines, soffits, and chimneys.

Whichever method you choose, exclusion is only step one. Bozeman-area wildlife professionals emphasize that finding every gap matters just as much as installing the device, noting that bats can squeeze through gaps as small as 3/8 of an inch, about the width of a dime. Permanent sealing after the bats have left is what actually solves the problem long-term.

Method	How It Works	Best Suited For
Netting or plastic sheeting	One-way barrier hung over exit points; bats leave but can’t find their way back	Small colonies, budget-conscious DIY projects
One-way exclusion doors (bat valves)	Rigid device installed at entry points; permits exit only	Larger colonies, recurring roosts, professional jobs
Permanent sealing and bat-proofing	Caulking, screening, and repair of gaps after bats have left	Every exclusion project, as a required follow-up
Licensed wildlife control service	Full inspection, exclusion, cleanup, and guano remediation	Historic buildings, large colonies, or homes with health concerns

For homeowners comparing regulatory approaches across the country, it’s worth noting that California’s wildlife removal laws and Arizona’s wildlife removal laws follow the same exclusion-first philosophy, even though the specific permitted devices and paperwork differ from Montana’s.

Do You Need a Permit to Remove Bats in Montana

For a typical homeowner excluding a nuisance bat colony from an attic or wall void, Montana does not require a special FWP permit as long as the process is non-lethal and follows proper timing. The permit requirement shifts once you move beyond simple exclusion. Montana’s administrative rules restrict who may possess a live bat, and the department may issue a permit for possession of a prohibited species only to specific entities such as accredited zoos, licensed menageries, USDA-licensed exhibitors, or rescue facilities with agency affiliation, not to individual homeowners hoping to relocate a colony themselves.

Trapping adds another layer of licensing. Montana wildlife control operators note plainly that it’s illegal in Montana to trap without a license, and once an animal is caught, it must be removed and dealt with in the proper manner according to Montana law. This is one reason most homeowners hire a licensed nuisance wildlife control operator rather than attempting to trap and physically move a bat colony themselves.

If your bat situation overlaps with other regulated activities, such as transporting an animal across property lines, you may also want to review how pet import laws in Montana handle animal transport documentation, since similar permit logic applies to any protected or regulated species crossing jurisdictional lines. Other states take a comparable licensing approach; Wisconsin’s wildlife removal laws also require a nuisance control license before an operator can trap and relocate protected wildlife.

What to Do If You Find a Bat Inside Your Home in Montana

A single bat that has wandered into your living room is a different situation than a colony in the attic, and it usually resolves itself quickly. MSU Extension’s guidance for this scenario is simple: a bat that has blundered into the living quarters of a house will usually find its way out by detecting air movement, so the simplest solution is to confine it to one room, then open windows and doors leading outdoors and allow it to escape. If it’s nighttime, dim the lights to allow the animal to find open doors and windows, while keeping some light on so an observer can confirm the bat finds its way out.

Don’t panic about aggression. Healthy bats normally will not attack people, even when chased. The real risk isn’t a bite from a healthy, uninterested bat; it’s rabies exposure from handling one incorrectly. Wildlife control operators serving Montana homes recommend a short list of precautions:

• Bats should never be touched with bare hands
• Avoid bats that display abnormal behavior, such as those found active during the day or unable to fly
• Teach children to never pick up a bat
• Have all dogs and cats vaccinated for rabies

That last point connects directly to broader pet ownership rules in the state. Keeping vaccinations current under pet vaccination laws in Montana protects your animals if they come into contact with a bat, and understanding dog bite laws in Montana matters too, since liability questions can get complicated if a pet is bitten while investigating a roost. If a bite or direct skin contact with a bat does occur, don’t release the animal; contact your local health department immediately, since post-exposure treatment decisions often depend on testing the bat itself.

Pro Tip: Keep pets leashed or contained during evening hours if you know bats are roosting nearby. Reviewing leash laws in Montana can help you understand your containment obligations while you wait for a professional exclusion to be completed.

Penalties for Illegal Bat Removal in Montana

Killing, poisoning, or otherwise harming a bat in Montana carries real financial risk, not just an ethical downside. Bozeman-area wildlife professionals state directly that lethal methods are illegal and can result in fines. Conservation advocates put it more bluntly: mishandling or killing federally protected animals is not something to take lightly, and you can end up facing some stiff fines if wildlife officials determine a violation occurred.

Because bats also fall under Montana’s rabies vector species restrictions, unauthorized possession carries a separate compliance risk beyond wildlife law. Holding onto a live bat outside the narrow exceptions described in the Department of Livestock’s import regulations can trigger public health enforcement in addition to any wildlife violation. This dual exposure, one wildlife-focused and one health-focused, is part of why professional exclusion services are so commonly recommended over DIY trapping.

Enforcement patterns vary across the country, and it’s worth noting that states like Illinois’s wildlife removal laws impose comparably structured fines for illegal nuisance wildlife handling, reinforcing that Montana’s approach isn’t an outlier. If you’re ever unsure whether a planned removal method is compliant, contacting Montana FWP before starting work costs nothing and can prevent a costly mistake.

Important Note: This article summarizes general legal principles for informational purposes and isn’t a substitute for advice from Montana FWP or a licensed attorney. Wildlife regulations can change, and specific circumstances, such as historic buildings, commercial properties, or health department involvement after a bite, may require additional legal steps not covered here.