Finding a colony of bats roosting in your attic in Washington raises a question that surprises a lot of homeowners: you can’t just call an exterminator and have them dealt with the way you would ants or mice. Bat removal laws in Washington treat these animals as protected wildlife, which means the timing, methods, and even who can legally do the work are all regulated by the state. Understanding these rules before you seal a single gap can save you from an unintentional wildlife violation.
Bats are also some of the most beneficial animals you’ll find near a Washington home, consuming enormous quantities of insects each summer night. That ecological value is part of the reason state law treats them differently from raccoons or squirrels. Below, you’ll find exactly what Washington law allows, when exclusion is permitted, and what happens if the rules aren’t followed.
Are Bats a Protected Species in Washington
Washington state law leaves little room for interpretation here. All species of bats are classified as protected wildlife and cannot be hunted, trapped, or killed under WAC 220-200-100. This blanket protection applies regardless of species, location, or whether the bat is causing a nuisance on your property.
Washington is home to 15 bat species, including the big brown bat, California myotis, canyon bat, fringed myotis, hoary bat, Keen’s myotis, little brown myotis, long-legged myotis, pallid bat, silver-haired bat, spotted bat, Townsend’s big-eared bat, western long-eared myotis, western small-footed myotis, and Yuma myotis. The little brown bat (Myotis lucifugus) is one of the species most commonly seen roosting in structures, while the Townsend’s big-eared bat (Corynorhinus townsendii) is among the rarer species you might encounter.
None of Washington’s bat species currently carry federal or state endangered or threatened status, but two species, Keen’s myotis and Townsend’s big-eared bat, are classified with a heightened conservation designation that calls for extra monitoring. That distinction matters because it can affect how cautious a wildlife control operator needs to be if either species turns up in your home.
Protection isn’t just symbolic. Bats deliver real economic value by controlling night-flying insect populations, and they play an essential role in ecosystem function, providing an estimated benefit of nearly $4 billion annually to the agricultural industry across North America through pest suppression. For a deeper look at how this protected status fits into the state’s broader wildlife framework, the guide to wildlife removal laws in Washington covers how bats compare with other regulated species like raccoons and coyotes.
Key Insight: Protected status applies to every bat in Washington, not just rare or endangered ones. A common little brown bat has the exact same legal protection as the rarer Townsend’s big-eared bat.
Is It Legal to Remove Bats From Your Home in Washington
Yes, but only under specific conditions. The Department of Fish and Wildlife makes exceptions for bats found in or immediately adjacent to a dwelling or other occupied building, and in such cases, these animals may legally be removed with no permit necessary. This exception exists precisely because bats so often end up roosting in attics, wall voids, and chimneys of occupied homes.
The catch is that “removal” does not mean killing. All bats in Washington are protected and cannot be hunted, trapped, or killed, though a wildlife control operator may legally remove bats found in or immediately adjacent to a dwelling or occupied building. That means any legal removal has to rely on humane, non-lethal exclusion rather than poison, glue traps, or lethal snap traps.
If you’re dealing with more than a stray bat that flew in through an open window, the scale of the job changes things. If you have a bat colony in your attic or walls, you need a certified professional rather than a DIY exclusion attempt. This is a different standard than Washington applies to some other wildlife conflicts; for comparison, the state’s approach to seasonal wildlife management shows up across categories like duck hunting laws in Washington and coyote hunting laws in Washington, where regulated take is permitted under very different rules than the strict no-kill standard that governs bats.
Bat Exclusion Season and Restricted Dates in Washington
Timing is arguably the most important legal detail in any Washington bat removal project. Timing matters enormously with bat exclusions, and when there is no immediate threat to human health, safety, or property, wildlife control operators should avoid excluding bats from a structure from mid-October through April because of hibernation risk, or from mid-May through mid-September because of the potential for flightless offspring.
The state’s own wildlife guidance echoes this window. If bats are found hibernating inside after October 15, they should be left alone until early spring, prior to the birthing period in May, after the weather has warmed enough for insects to be out regularly, while entry points into human living spaces should be sealed in the meantime. Disturbing a maternity colony carries real risk to the animals themselves — disturbing a maternity colony when flightless young are present may cause young bats to be dropped to their deaths, or abandoned, by panicked females.
| Period | Status | Why |
|---|---|---|
| Mid-October through April | Restricted | Bats may be hibernating in the structure |
| Mid-May through mid-September | Restricted | Flightless pups present during maternity season |
| Mid-August through mid-October | Approved window | Young bats have learned to fly; cold weather hasn’t arrived |
| Early spring (before May) | Approved window | Before the birthing period begins |
The recommended exclusion windows run from mid-August to mid-October, after the young bats have learned to fly and before cold weather arrives, or in early spring before the birthing period in May. Outside those windows, sealing a structure can trap pups inside or force hibernating adults out into lethal cold — both scenarios that violate the state’s protected-species rules even if unintentional.
Important Note: Emergency exceptions exist when bats pose an immediate health or safety threat, but routine nuisance complaints generally don’t qualify for off-season exclusion. When in doubt, contact a licensed wildlife control operator before sealing any opening.
Approved Bat Removal Methods in Washington
Washington law is specific about method, not just timing. The approved way to remove bats is through a process called exclusion, which simply means allowing them to leave a structure but preventing their return, typically carried out through humane, hands-off techniques. This is fundamentally different from trapping, which the state discourages for bats.
Wildlife guidance is explicit that you should never trap flightless young or adult bats inside a structure, since this is needlessly cruel to the bats and can create a serious odor problem, and trapping and relocating bats is not recommended. Live traps left unattended around a bat roost also carry real risk to the animals, since overcrowded or unmonitored traps can be fatal.
Approved exclusion methods typically include:
- Installing one-way exclusion devices or netting over identified entry and exit points during an approved window
- Sealing secondary gaps, vents, and cracks after bats have vacated the primary opening
- Installing a bat house nearby to give displaced bats an alternative roost
- Hiring a certified wildlife control operator for attic or wall-void colonies rather than attempting DIY exclusion
- Decontaminating and cleaning guano-affected areas once bats have fully vacated
For structures with large, long-established colonies, professional help isn’t just recommended — it’s the safer legal path. If you have a bat colony in your attic or walls, you need a certified professional, not a DIY exclusion attempt. This mirrors how Washington treats other wildlife conflicts requiring specialized handling; the state’s broader hunting laws in Washington similarly draw a hard line between activities the public can do themselves and those that require licensed involvement.
Do You Need a Permit to Remove Bats in Washington
For most homeowners, the answer is no. When bats are found in or immediately adjacent to a dwelling or occupied building, they may legally be removed and no permit is necessary. This exception is built directly into the state’s protected-wildlife rule so homeowners aren’t forced to leave a roosting colony untouched indefinitely.
Where permits re-enter the picture is trapping and relocation. Washington guidance discourages this practice outright for bats, and any deviation from standard exclusion — such as capturing bats for transport somewhere else — moves into territory that can require specific authorization. If a sensitive species like Townsend’s big-eared bat is involved, or if a colony is large enough to raise questions about method, contacting your regional WDFW office before proceeding is the safer route.
Pro Tip: Even when no permit is legally required, documenting the date, method, and species involved in a bat exclusion project gives you a paper trail if a neighbor or code enforcement officer ever questions the work.
Washington’s permit-light approach to bat exclusion stands out compared with how some other states regulate wildlife removal. States handle nuisance wildlife differently enough that a method legal in one place can require paperwork in another — a pattern you can see by comparing wildlife removal laws in California, wildlife removal laws in Arizona, and wildlife removal laws in Minnesota against Washington’s framework.
What to Do If You Find a Bat Inside Your Home in Washington
A single bat flying through a living room calls for a calmer approach than most people expect. State guidance is direct: do not touch the bat, and leave it in place unless advised to move it. Panicked swatting or chasing tends to make the situation worse and increases the odds of a bite or scratch.
If the bat does need to be moved, follow this sequence:
- Close off the room and open a window or door leading outside, giving the bat a clear exit path.
- If the bat must be captured, use thick gloves and a container to safely contain it, then release it outdoors during mild weather conditions, above 50°F, without rain or high winds, to ensure its survival.
- If the bat must be moved, use thick gloves and a shovel or box to gently pick it up and move it to a protected, elevated location like a tree, since most bat species have a hard time taking flight from the ground.
- Wash your hands thoroughly and disinfect any surfaces the bat contacted.
Rabies exposure is the one scenario that changes everything. While a small percentage of bats can carry rabies, five to 10% of sick, injured, or dead bats tested by the Washington State Department of Health have tested positive, though the agency estimates that less than 1% of the native wild bat population carries the virus. If anyone was bitten, scratched, or had direct skin contact with a bat, don’t release it — contact your local health department or animal control immediately, since post-exposure guidance often depends on testing the animal. This exposure risk is part of why Washington treats direct animal contact seriously across categories, similar to how the state approaches liability under its dog bite laws in Washington.
Outdoor cats add another wrinkle. A cat that catches and brings in a bat creates the same exposure concerns as a direct encounter, and it’s worth reviewing how outdoor cat laws in Washington address pets that interact with wildlife on your property.
Penalties for Illegal Bat Removal in Washington
Washington backs its protected-wildlife rules with real criminal exposure. Under state law, a person is guilty of unlawful taking of protected fish or wildlife if they violate any rule of the commission regarding the taking, harming, harassment, possession, or transport of protected fish or wildlife, and unlawful taking of protected fish or wildlife is a misdemeanor.
The penalties can stack quickly if multiple bats are involved. Where it is unlawful to hunt, take, fish, possess, or traffic in big game or protected or endangered fish or wildlife, each individual animal unlawfully taken or possessed is treated as a separate offense. That means sealing an attic during maternity season and killing an entire colony of pups wouldn’t be treated as one violation — it could be charged per animal.
Courts can also impose financial penalties beyond the base misdemeanor charge. If a person is convicted and the violation results in the death of protected wildlife, the court must require payment of a criminal wildlife penalty assessment for each animal taken or possessed, distributed to the state’s fish and wildlife enforcement reward account. Jurisdiction for these cases sits with the courts closest to where the violation occurred — district courts have jurisdiction concurrent with superior courts for misdemeanors and gross misdemeanors under this chapter.
| Violation Type | Classification | Additional Consequence |
|---|---|---|
| Unlawful taking of protected wildlife (e.g., killing a bat) | Misdemeanor | Criminal wildlife penalty assessment per animal |
| Multiple bats killed in one incident | Separate offense per animal | Penalties can stack per animal taken |
| Repeat violation within five years | Elevated penalty consideration | Court may weigh prior convictions in sentencing |
Enforcement patterns vary across the country, and comparing how neighboring frameworks handle similar violations can be useful context — see how wildlife removal laws in North Carolina and wildlife removal laws in Wisconsin structure their own penalties for similar wildlife violations. Discovering a dead bat on your property, rather than a live one needing exclusion, raises a separate set of questions worth reviewing through the state’s roadkill laws in Washington.
Common Mistake: Assuming that because bats aren’t federally endangered, killing one carries minimal risk. Washington’s misdemeanor penalty for unlawful taking of protected wildlife applies to every bat species in the state, regardless of federal listing status.
Working within these rules isn’t complicated once you know the framework: confirm the timing falls outside the restricted hibernation and maternity windows, use exclusion rather than lethal methods, and bring in a certified wildlife control operator for anything beyond a single stray bat. Following that sequence keeps you on the right side of Washington’s bat removal laws while still solving the problem in your attic.