Bat Removal Laws in Colorado: When It’s Legal to Exclude Bats from Your Home
September 1, 2026
Finding a colony of bats in your attic is stressful enough without wondering whether you’re about to break the law by getting rid of them. Bat removal laws in Colorado are stricter than most homeowners expect, because nearly every bat species in the state is legally protected wildlife, not a pest you can handle however you like. Before you seal a single entry point or call an exterminator, it helps to understand what Colorado actually permits.
This guide walks through what Colorado Parks and Wildlife (CPW) says about bat protections, when exclusion work is allowed, which removal methods pass legal muster, and what happens if you get it wrong. For a broader look at how the state treats other wild animals in and around homes, Colorado’s wildlife removal laws cover the same general framework that applies to bats.
Are Bats a Protected Species in Colorado
Yes. Colorado classifies bats as nongame wildlife, and under Colorado Parks and Wildlife’s Chapter W-10 regulations, nongame species and subspecies, including threatened or endangered wildlife, are protected, meaning their harassment, taking, or possession is prohibited outside a handful of licensed exceptions. That protection applies statewide, whether the bats are roosting in a barn on the plains or an attic in the Front Range suburbs. Colorado is home to a genuinely large bat population for a landlocked state. According to CPW, 18 different species of bats live in Colorado, with some residing year-round and others passing through during migration. The most commonly encountered species in homes is the big brown bat (Eptesicus fuscus), a cold-tolerant species that’s comfortable in attics and soffits year-round.
Not every species carries equal legal weight. Townsend’s big-eared bat (Corynorhinus townsendii) is officially listed on Colorado’s Threatened and Endangered Species roster, which means encounters with this species trigger extra caution beyond the standard nongame protections. Bats also carry serious ecological value that factors into why the state protects them so broadly: a single little brown bat can eat thousands of insects a night, and CPW estimates bats’ pest-control contribution to agriculture is worth billions of dollars nationally.
Key Insight: Colorado doesn’t just protect endangered bat species. Under CPW’s nongame wildlife rule, essentially every bat species native to the state is off-limits to harassment or killing, regardless of how common it is in your neighborhood.
Is It Legal to Remove Bats From Your Home in Colorado
Removing bats from your home is legal in Colorado. Killing them generally is not, unless they pose a direct threat to human health or safety, such as a confirmed rabies exposure situation. Colorado law protects bats, and they can’t be killed unless they pose a danger to human health and safety. That distinction shapes everything about how bat removal has to work here. The legal path is exclusion, not extermination: removal efforts should focus on humane exclusion techniques that let bats leave a structure on their own while blocking re-entry. Lethal methods, including poison, traps designed to kill, or pest-control chemicals, fall outside what the law allows for a nongame protected species.
This is also where bat removal starts to overlap with Colorado’s broader animal protection framework. Deliberately killing or harming a protected bat without legal justification can raise the same kinds of questions addressed under Colorado’s animal cruelty laws, even though bats are wildlife rather than pets or livestock. The safest assumption for any homeowner is that exclusion, not elimination, is the only legally defensible route.
Bat Exclusion Season and Restricted Dates in Colorado
Timing matters as much as method when it comes to legal bat removal. CPW advises against sealing bats out of buildings during the June-through-August pupping period, because young bats born that season aren’t yet able to fly and will die trapped inside walls or attics if their roost is sealed while they’re still present. Some bat removal professionals cite an even more specific maternity window, noting that in Colorado, bat maternity season spans from June 1 to August 15, though CPW’s own general guidance frames it as a June-through-August range.
Important Note: Sources differ slightly on the exact maternity-season cutoff date in August. To stay safely within the law, plan exclusion work either before June 1 or after the entire colony (including juveniles) is confirmed flying, rather than cutting it close to any single date. Getting the timing wrong doesn’t just risk legal trouble. Timing is important to avoid killing bats and their pups, since trapping them tends to backfire by pushing panicked bats into occupied living spaces as they search for an exit. Winter brings a different consideration: big brown bats are known to overwinter inside heated structures, so sealing entry points during cold months can trap hibernating bats rather than excluding active ones.
| Season | Typical Timing | Exclusion Status in Colorado |
|---|---|---|
| Early Spring | March-May | Generally allowed, before pups are born |
| Pupping/Maternity Season | June-mid-August | Restricted; sealing points risks trapping flightless pups |
| Late Summer/Fall | Mid-August-October | Generally allowed, after young bats can fly |
| Winter | November-February | Use caution; some bats overwinter/hibernate in structures |
Migration periods add one more wrinkle. During migration time, finding a bat hanging under an eave, a porch overhang, or tucked behind shutters or gutters is normal, and the recommended response is simply to leave the bat alone since it will typically move on by itself. This lines up with how Colorado’s duck hunting laws handle other wildlife: seasonal restrictions exist precisely because certain windows carry higher biological stakes than others.
Approved Bat Removal Methods in Colorado
Colorado law recognizes exclusion as the only approved approach to removing bats from a structure, and the accepted techniques all center on letting bats leave without harming them.
- Inspection: A thorough property inspection identifies every active entry point and vulnerability before any work begins.
- One-way exclusion devices: Licensed operators seal entry points and install one-way doors so bats can exit but cannot re-enter the home.
- Permanent sealing: Heavy-duty materials like steel or wire mesh screens, designed specifically for bat exclusion, close off gaps around rooflines, vents, and soffits once bats have left.
- Guano cleanup and decontamination: Left untreated, guano buildup in an attic can exceed hundreds of pounds, so cleanup and sanitizing typically follow a successful exclusion.
Poison and lethal traps are explicitly outside the approved toolkit. Licensed Colorado wildlife operators emphasize that poisons are never an acceptable option for bat removal, and only licensed wildlife specialists may perform humane bat removal using approved exclusion methods. That’s a notably stricter standard than how some general nuisance wildlife is handled in other states; California’s wildlife removal laws and Arizona’s wildlife removal laws both carve out similar bat-specific exclusion requirements, reflecting a broader western-state pattern of treating bats as protected rather than as ordinary nuisance animals.
Pro Tip: If you’re doing your own inspection before hiring help, look at rooflines, attic vents, chimney gaps, and siding joints at dusk. Watching where bats exit at twilight is the most reliable way to find every active entry point.
Do You Need a Permit to Remove Bats in Colorado
Basic exclusion work, such as sealing gaps and installing one-way doors, generally doesn’t require a special permit because it isn’t classified as “taking” a protected species; the bats leave under their own power. Where permits and licenses come into play is anything beyond passive exclusion. CPW’s nongame wildlife rule allows harassment, taking, or possession of a protected species only under a scientific collecting license, a rehabilitation license, or a license issued for zoological, educational, or propagation purposes. Colorado’s regulation even carves out a narrow, species-specific allowance: bats, along with mice, voles, rats, porcupines, and ground squirrels, may be captured or killed only under specific hazard circumstances defined in state code, not as a general homeowner option. Some Colorado bat removal companies note this plainly, cautioning that permits are required for handling these animals for any kind of relocation. In practice, that means most homeowners are better served hiring a licensed wildlife control operator rather than attempting to trap and relocate bats themselves. For comparison, states like North Carolina’s wildlife removal laws apply a similarly tiered licensing structure for handling protected nongame species, so this isn’t unique to Colorado; it’s a common feature of state wildlife codes nationwide.
What to Do If You Find a Bat Inside Your Home in Colorado
A single bat loose in a living space calls for a calm, specific response rather than panic. CPW’s guidance is to avoid handling the bat directly and instead place a box or can over it to contain it without touching it.
- Keep people and pets away from the bat and never touch it with bare hands.
- If direct contact may have occurred, or the bat was found near a sleeping person, a child, or anyone unable to confirm whether contact happened, contact local public health officials or a medical professional before releasing the animal.
- For bats encountered between July and November, or any time contact happened without protective gear like leather gloves, contact your local county health department immediately.
- Between December and June, report sightings of active or dead bats to CPW’s white-nose syndrome surveillance line, since bats found during these months might be sick.
That white-nose syndrome concern isn’t hypothetical in Colorado. The fungus responsible for the disease was confirmed in the state in the summer of 2022, and the first Colorado bat confirmed to have died from it, a Yuma myotis, was found at Bent’s Old Fort National Historic Site in spring 2023. CPW continues tracking the disease’s spread and asks residents to report unusual bat activity through the dedicated hotline at 303-291-7771. If you’re dealing with an injured or dead bat outdoors rather than one inside your home, the reporting and handling steps follow a similar logic to how Colorado’s roadkill laws approach encounters with wildlife carcasses: don’t handle it casually, and report it through the correct channel rather than disposing of it yourself.
Penalties for Illegal Bat Removal in Colorado
Because bats fall under Colorado’s nongame wildlife protections, harassing, taking, or possessing them outside the licensed exceptions is a regulatory violation, not a gray area. Killing a bat that isn’t posing an active danger to human health or safety exposes a homeowner or contractor to the same enforcement framework that covers other protected nongame species in the state. The stakes can extend beyond state-level consequences. Many states protect every native bat species rather than just federally listed ones, and violating these state laws can trigger both state penalties and federal exposure under statutes like the Lacey Act when bats are transported or trafficked across state lines. Colorado’s approach fits that pattern closely, given how broadly its nongame rule defines protected status. Minnesota’s wildlife removal laws follow a comparable enforcement structure, underscoring that this isn’t a Colorado quirk but a common feature of state wildlife statutes. Because non-lethal methods are legally required, hiring a licensed wildlife control service is generally the safer route: professional operators are trained to comply with local regulations, while a DIY approach that ends in a dead bat or a sealed-in colony can turn a simple attic problem into a wildlife violation.
Important Note: This article summarizes general Colorado wildlife regulations and shouldn’t substitute for legal advice. If you’re facing a specific enforcement question or an active bat-related health exposure, contact Colorado Parks and Wildlife or your county health department directly.
Bat removal in Colorado comes down to three consistent principles: exclusion instead of extermination, correct timing around the pupping season, and licensed help for anything beyond simple sealing work. Following those three rules keeps a bat problem from turning into a wildlife violation, and it protects a species that, despite its unnerving reputation, does more for Colorado’s ecosystem than most homeowners realize.