Bat Removal Laws in Oregon: What Homeowners Need to Know Before Excluding Bats

If you have heard scratching in your attic and assumed you can simply call an exterminator to get rid of the problem, Oregon law says otherwise. Bat removal laws in Oregon treat these animals as protected wildlife, not pests, which means the timing, methods, and even who can legally do the work are all regulated by the state. Understanding these rules before you act can save you from fines, delayed repairs, or an accidental violation of state wildlife protections.

This guide walks through what Oregon law actually requires, from seasonal restrictions to permit rules, so you can handle a bat problem the right way from the start.

Are Bats a Protected Species in Oregon

Every bat species found in Oregon carries some form of legal protection, though the level of protection varies by species. In Oregon, eight of 15 species are state sensitive, and more than 50 percent of native bats in North America are at risk. That statistic alone explains why the state treats bat colonies differently than it treats squirrels or raccoons in your attic.

The Townsend’s big-eared bat (Corynorhinus townsendii) illustrates why this matters. Townsend’s big-eared bat is very vulnerable to human disturbance, and its numbers are declining. In Oregon, it is classified as a State Sensitive Species, and it’s also an Oregon Conservation Strategy Species in all ecoregions except Nearshore. Two other species round out the state’s rarest bats: Oregon is home to two rare, at-risk desert bats, the pallid bat (Antrozous pallidus) and spotted bat (Euderma maculatum), both recognized as State Wildlife Action Plan species.

The species most likely to show up in your home are less rare but still protected. Big brown bats and little brown bats are the colony-forming species that most often roost in attics, chimneys, and wall voids, since the bats that most often become a problem around people are those that live in colonies or groups, such as little brown bats and big brown bats, and these species sometimes hibernate or roost inside buildings. Regardless of which species you are dealing with, the legal framework is the same: bats are managed under Oregon’s wildlife laws, and extermination is not an option.

Key Insight: Protection status is not limited to rare species. Even common bats like the big brown bat and little brown bat fall under the same state exclusion rules as sensitive species, since Oregon regulates the removal method rather than singling out specific bats for protection.

Is It Legal to Remove Bats From Your Home in Oregon

Removing bats is legal in Oregon, but only through approved exclusion methods and only outside the restricted season. Bats are important pollinators and are a protected species, so unwanted bats are managed through exclusion rather than removal methods. That single distinction, exclusion versus removal, shapes every other rule discussed in this article.

State rules also draw a line between a lone bat that wandered indoors and an established colony. Capture of bats from indoor areas not associated with roosting, hibernaculum and nurseries is permitted year round, provided that the bat is immediately released outdoors or taken to a licensed wildlife rehabilitator. A colony that has settled into a roost, on the other hand, triggers the seasonal and procedural rules covered below.

Anyone charging a fee for bat control services needs specific state authorization. A WCO permit is required for any individual, business owner, or the business owner’s designee charging a fee to control bats. If you are a property owner handling the issue yourself without hiring anyone, different permit rules apply, which are covered in a later section. For comparison, states handle nuisance wildlife differently; California’s wildlife removal laws and Arizona’s wildlife removal laws take somewhat different approaches to permitting and species protection than Oregon does.

Bat Exclusion Season and Restricted Dates in Oregon

Timing is the single most important legal detail in Oregon bat removal, and it is written directly into administrative rule. Under Oregon law (ORS 635-435-0010) you can’t remove or exclude bats during June, July and August, to protect immobile pups (baby bats) that may be present. This blackout period exists because young bats cannot fly or fend for themselves during those months, and sealing an entry point during that window can trap and kill pups inside a wall or attic.

Outside the summer restriction, timing still matters for practical reasons. The optimal bat exclusion season is late August through early November. Oregon State University Extension frames the guidance the same way: baby bats may not be able to fly independently until the end of August, so it’s advisable to do your exclusion treatments between the first of September and before the start of winter when bats are beginning to explore and occupy winter roosts.

Time Period	Legal Status for Exclusion	Why
June, July, August	Prohibited by ORS 635-435-0010	Pups are immobile and cannot survive being sealed inside
Early September to early November	Recommended window	Pups can fly independently; bats have not yet settled into winter roosts
Winter (deep cold months)	Legally allowed but not ideal	Bats may be hibernating in hard-to-detect locations
Spring (before June)	Legally allowed but risky	Maternity colonies may already be forming

There is a narrow exception to the summer rule. Unless it can be shown that the bats are not raising young at the roost and an exception is provided by ODFW, WCOs will not be able to help during this sensitive biological time period. In practice, this exception is rarely granted, so most homeowners simply plan their exclusion work for the fall inspection window instead.

Approved Bat Removal Methods in Oregon

Oregon does not leave the “how” up to interpretation. The state recognizes one primary humane method, and several practices are explicitly prohibited regardless of season.

• One-way exclusion devices: A valve or tube is installed at the main entry point so bats can leave to feed but cannot re-enter, which is the standard practice recommended by OSU Extension for eave and attic exclusions.
• Sealing secondary entry points: You can bat-proof your home yourself by finding all possible entrances (as small as 1/4 inch) and closing them up.
• Double-checking for trapped animals: Double (and triple) check that you aren’t trapping any bats inside the building before finishing the seal.
• Year-round capture and release for lone bats: Bats inside buildings that are NOT roosting, hibernating or tending nurseries can be captured year-round; just be sure you release them immediately outside or take them to a licensed wildlife rehabilitator.

What is off the table matters just as much. Trapping bats for relocation and using poison or fumigation are not accepted practices in Oregon; wildlife rehabilitators who work in this space consistently warn that homeowners should never use traps or attempt to relocate bats, and never do a removal during the maternity season. Poison-based approaches are considered both ineffective and unlawful, since a dead bat sealed inside a wall creates odor, disease exposure, and structural damage that exclusion methods avoid entirely.

Common Mistake: Sealing every visible gap before confirming all bats have left is one of the most frequent errors homeowners make. Skipping the one-way valve step traps bats inside, which turns a legal exclusion into an unintended, and illegal, killing of protected wildlife.

Do You Need a Permit to Remove Bats in Oregon

Permit requirements depend on who is doing the work and whether money changes hands. The rules split into two clear categories.

1. Hiring a paid wildlife control operator (WCO): A WCO permit is required for any individual, business owner, or the business owner’s designee charging a fee to control bats, furbearers, unprotected mammals, wild turkeys and western gray squirrels causing damage. WCOs must also follow additional operating rules; WCO permittees must comply with all state wildlife laws and regulations, and all activities must be in compliance with conditions specified by these rules, permit or authorization from the Department.
2. Doing it yourself as a property owner: A private property owner that chooses to trap and lawfully remove an animal from his or her property needs an ODFW permit, but not a WCO permit, and such permits are free of charge and can be obtained by contacting the nearest ODFW office.

Even though a free ODFW permit is available for DIY trapping, the state generally steers homeowners toward professionals for bat work specifically. ODFW recommends that private property owners unfamiliar with trapping wildlife seek the help and advice of professional WCOs before attempting to trap or remove wildlife, in order to best protect the welfare of the animal and the health and safety of people. ODFW itself does not handle removal requests directly: ODFW is unable to respond to homeowner requests for bat removal, so if you have roosting (nesting) bats living in your attic or other areas of your house, you should call a wildlife control operator (WCO).

For a broader sense of how permit structures vary by state, comparing Oregon against Minnesota’s wildlife removal laws or North Carolina’s wildlife removal laws shows just how much permitting authority differs from one wildlife agency to the next.

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

A single bat flying through a living room is a different situation than a colony in the attic, and Oregon’s guidance reflects that. If the bat wandered in by accident, patience is usually the fastest fix: if a bat has flown in an open door or window by accident, you can help the bat find its own way out by opening an exterior door and dimming interior lights, since bats naturally seek the darker outdoor opening.

If the bat needs to be physically captured, do it carefully. Never touch or pick up a bat with bare hands. Anyone attempting a hands-on capture should be certain that they are wearing gloves when trying to capture the bat, choosing a thick pair rather than thin gardening gloves, since bites can go unnoticed on bare skin. Once contained, the same rule applies as with any stray bat: bats inside buildings that are NOT roosting, hibernating or tending nurseries can be captured year-round, and you should be sure to release them immediately outside or take them to a licensed wildlife rehabilitator.

If you find a bat with unusual symptoms or discover several dead bats in one spot, contact the state directly rather than handling it yourself. Call ODFW if you find several dead or injured bats in one place, or if you find a bat in the winter that has a white substance on its face or wings, since both could be signs of an infectious disease that could affect bat populations. That white substance is typically associated with white-nose syndrome, a disease that has devastated bat colonies in other parts of the country and that ODFW tracks closely to protect Oregon’s remaining populations.

Pro Tip: If you discover an active roost rather than a single stray bat, resist the urge to handle it yourself. Roost removal is exactly the scenario that triggers the seasonal exclusion rules and permit requirements covered earlier in this guide.

Penalties for Illegal Bat Removal in Oregon

Because bats fall under Oregon’s wildlife laws, violations are not treated as minor code infractions. Violation of the law constitutes a Class A misdemeanor with an enhanced felony provision for subsequent convictions involving certain species. While that enhanced felony tier is aimed at species like game animals, the Class A misdemeanor classification for wildlife law violations generally still applies to unlawfully killing or removing protected bats outside legal exclusion methods.

Repeat violations carry consequences beyond fines. Upon the third conviction within a 10-year period for violation of a provision of the wildlife laws, the court shall order all guns, boats, vehicles, traps, fishing apparatus, electronic devices and other implements used in committing the third or subsequent offense to be seized and forfeited to the State of Oregon. For a homeowner or contractor, that means equipment used in an illegal removal, from traps to vehicles, can legally be taken by the state after repeated offenses.

Wildlife control professionals who ignore proper protocol also risk their livelihood, not just a fine. WCO permits come with the explicit condition that all activities must be in compliance with conditions specified by these rules, permit or authorization from the Department, meaning a permit can be suspended or revoked for using prohibited methods like poison or off-season exclusion, on top of any statutory penalty the operator faces personally.

Oregon’s approach to bats sits within a much larger framework of state wildlife regulation that touches everything from hunting laws in Oregon to roadkill laws in Oregon, all enforced under the same wildlife law chapters. If your property also deals with other nuisance wildlife concerns, rules for backyard chicken laws in Oregon can offer useful context on how the state balances homeowner rights with animal welfare in residential settings. And if you are researching how neighboring or comparable states handle similar exclusion timing, Wisconsin’s wildlife removal laws and Virginia’s wildlife removal laws are worth reviewing side by side with Oregon’s rules.

Handling a bat problem in Oregon comes down to three things: timing your exclusion outside the June through August blackout, using a one-way valve rather than traps or poison, and knowing whether your situation calls for a paid WCO or a free ODFW permit. Get those three details right, and you can solve the problem legally while keeping Oregon’s protected bat populations intact.