Quick Reference Table
| Feature | Details |
|---|---|
| Species in Oklahoma | 5 primary pest-relevant species (see below) |
| Federal Protection | All Oklahoma bats protected under Migratory Bird Treaty Act; some species listed under Endangered Species Act |
| Exclusion Window | August 16 through April 30 ONLY, no exclusion May 1 through August 15 (maternity season) |
| Primary Structure Entry | Gaps as small as 3/8 inch at rooflines, soffits, fascia, chimney flashing |
| Health Risks | Histoplasmosis (guano), Rabies (bite or scratch), Bat Bugs |
| Common Entry Points | Soffit-fascia gaps, ridge vents, chimney caps, loose flashing, deteriorated caulk at roofline |
| Removal Method | One-way exclusion devices only, trapping is not effective and not recommended |
| Common in OKC Metro | Yes, Big Brown Bat and Mexican Free-tailed Bat most common in structures |
Opening
Oklahoma is home to a significant bat population, and for good reason: the state’s mix of mature hardwood trees, limestone caves and bluffs in the western portions, and a massive urban heat island in OKC creates ideal roosting habitat for multiple species. Most Oklahoma bats cause no problems at all. They consume enormous quantities of insects, including mosquitoes, and rarely interact with people.
The exceptions are the species that roost in buildings. Big Brown Bats and Mexican Free-tailed Bats are both documented structure-roosters throughout the OKC metro. A maternity colony of either species can number from a dozen to several hundred individuals in a single attic. The guano accumulates, the odor becomes significant, and the Histoplasma risk rises with every season the colony goes undisturbed.
If bats are in your attic, chimney, or wall voids, the exclusion timeline is strictly governed by federal law. Understanding when you can act, and how, is the starting point for every bat job Alpha Pest Solutions handles.
Critical rule: No exclusion work may be performed between May 1 and August 15 in Oklahoma. This is the bat maternity season. Young bats born during this period cannot fly, and sealing entry points during this window traps flightless juveniles inside the structure. Violation of this rule also constitutes a federal MBTA violation. If bats are discovered during this window, the legal and appropriate response is to document the situation, prepare for exclusion after August 15, and contact Alpha Pest Solutions to schedule the work.
Call (405) 977-0678 for a free inspection and exclusion timeline assessment.
Are All Oklahoma Bats Protected?
Yes. Every Oklahoma bat species is protected under the federal Migratory Bird Treaty Act (MBTA). Some species, including the Tricolored Bat and Northern Long-eared Bat, are additionally listed under the Endangered Species Act. This means:
– You cannot kill bats, even inside your own home, without a federal permit
– You cannot trap bats and relocate them (not effective and legally problematic)
– You cannot seal entry points while bats are present inside
– Exclusion using one-way devices is the only legal method of bat removal from structures
The exclusion process installs one-way doors or tubes at all active entry points, allows bats to exit during their normal nightly activity, and prevents re-entry. After 4-7 days of confirmed exit activity with no remaining bats inside, entry points are permanently sealed. The one-way devices are then removed.
This process must be completed either before May 1 or after August 15 to avoid the maternity season exclusion prohibition.
Oklahoma Bat Species at a Glance
Big Brown Bat (Eptesicus fuscus)
The most commonly encountered bat in OKC area structures. Medium-large at 4-5 inches body length and 12-14 inch wingspan. Brown to dark brown with lighter underparts. Slow, direct flight path is distinctive. Roosts in attics, wall voids, under soffits, and in chimneys. Forms maternity colonies of 20-200 females in late spring. The species most likely responsible for attic bat problems throughout the metro. See our Big Brown Bat page for full identification, behavior, and exclusion details.
Mexican Free-tailed Bat (Tadarida brasiliensis)
One of the most abundant bat species in North America and a very common Oklahoma resident. Smaller than the Big Brown at about 3.5 inches with a 12-inch wingspan. Named for its tail, which extends noticeably beyond the tail membrane. Dark gray-brown. Fast and erratic flier. Forms some of the largest bat colonies in the world in cave environments in Texas; in Oklahoma, structure roosts are typically smaller but still significant. Frequently found in attic and chimney situations in OKC metro.
Little Brown Bat (Myotis lucifugus)
Small (3-4 inches, 9-11 inch wingspan), with glossy brown fur and notably large feet relative to body size. One of the most common North American bats. Has declined significantly due to White-nose Syndrome, a fungal disease that has devastated hibernating bat populations east of the Rockies. Still present in Oklahoma. Roosts in small groups in attics, behind shutters, and under fascia boards. Less commonly encountered in OKC metro than the Big Brown or Mexican Free-tailed.
Eastern Red Bat (Lasiurus borealis)
A tree bat, not a structure rooster. Males are brick red; females are chestnut brown. Roosts in tree foliage rather than buildings. When Eastern Red Bats are found inside structures, it is typically accidental entry through an open window or door, not a roost situation. The correct response is to open the window and allow the bat to leave, or to contain it safely and contact a licensed wildlife handler. Does not form colonies.
Tricolored Bat (Perimyotis subflavus)
Formerly called the Eastern Pipistrelle. Small (3 inches, 8-10 inch wingspan), with distinctively tricolored fur: dark brown at the base, lighter in the middle, and dark tips. Listed as Threatened under the Endangered Species Act due to White-nose Syndrome impacts. Rarely found in structures in the OKC metro. If a Tricolored Bat is encountered, contact the Oklahoma Department of Wildlife Conservation before taking any action.
Signs of Bats in Your Structure
Guano at the base of the structure: Bat droppings (guano) accumulate directly below the entry point and roost site. Bat guano is small (similar in size to mouse droppings but longer and thinner), dark brown to black, and crumbles easily when dry, unlike rodent droppings which do not crumble. This crumbling test is the fastest way to distinguish bat guano from mouse droppings on an attic floor.
Staining at entry points: Bat fur produces an oily residue that builds up over time at regularly used entry points, creating a dark brown or black stain at the gap edges. This staining is visible on roofline gaps, soffit joints, and chimney flashing.
Odor: A significant bat colony produces a strong, acrid ammonia smell from accumulated guano and urine. This odor intensifies through summer when the colony is at peak size. It can penetrate into living spaces through ceiling penetrations and HVAC systems.
Evening activity: Bats exit their roost site at dusk to begin foraging. Watching the roofline at dusk on a calm evening will confirm bat exit activity. Multiple bats exiting from a single gap within a 20-30 minute window indicates a roost, not a random stray bat.
Sounds: Light chittering and rustling in the attic, particularly at dusk and just before dawn when bats are returning to roost. Not as loud as squirrel or raccoon activity, and strictly tied to dawn/dusk timing.
Health Risks
Histoplasmosis: Bat guano is a primary growth substrate for Histoplasma capsulatum, the fungal pathogen that causes histoplasmosis. Oklahoma’s soil already carries native Histoplasma; accumulated guano in an attic creates a concentrated, enclosed Histoplasma environment. Disturbance of dry guano, whether during cleanup, renovation, or HVAC maintenance, releases spores. Never dry-sweep bat guano or disturb accumulated deposits without appropriate respiratory protection (N95 minimum, P100 preferred). Professional guano remediation is the safe approach. See Attic Remediation for our cleanup process.
Rabies: Bats are a known rabies reservoir in Oklahoma. The Oklahoma Department of Health reports bat-associated rabies exposures annually. Bats rarely bite unprovoked, but the risk is real if a bat is handled without gloves, if a bat is found in a room with a sleeping person, or if a pet has contact with a bat. If any potential exposure occurs, contact the Oklahoma Department of Health immediately and preserve the bat for testing if possible without direct handling. The Oklahoma City-County Health Department and OSDH both maintain guidance on bat rabies exposure protocols.
Bat Bugs: Bat colonies support bat bug populations (Cimex adjunctus). When bats are excluded and the colony vacates, bat bugs left behind with no host migrate through the structure in search of an alternative food source. Bat bug infestations in the weeks following a bat exclusion are a documented and expected outcome, and should be addressed with professional treatment. See our Bat Bug page for identification and what to expect.
The Exclusion Process
One-way exclusion is the only legal and effective bat removal method for structures. Here is the standard process:
1. Full exterior inspection: Every potential entry point is identified and assessed. Bats can enter through gaps as small as 3/8 inch. Common entry points include soffit-fascia joints, ridge vent gaps, chimney flashing separations, loose boards at gable ends, and any gap at roof deck intersections.
2. Exclusion device installation: One-way tubes or netting cones are installed at active entry points. Bats exit through the device but cannot re-enter. Secondary entry points are permanently sealed during this step.
3. Monitoring period: 4-7 days of confirmed exit and no re-entry before sealing the primary entry points.
4. Final seal: All remaining exclusion devices are removed and entry points permanently sealed with appropriate materials.
5. Guano assessment: After exclusion is confirmed, the attic is assessed for guano volume and remediation need.
Timing: Exclusion must be completed before May 1 or after August 15. Work initiated in late summer (mid-August) should be completed before cold weather drives bats into deep wall voids where monitoring becomes difficult.
Frequently Asked Questions
When can bats be removed from my house in Oklahoma?
Bat exclusion can only be performed outside of the maternity season: August 16 through April 30. No exclusion work may be done May 1 through August 15. If you discover bats during this window, document the situation and schedule exclusion for August 16 or later. Alpha Pest Solutions will assess and confirm the exclusion window for your specific situation.
Do I need a permit to remove bats from my home?
No federal or state permit is required for a property owner to exclude bats from a structure using one-way exclusion methods, as long as the work is done outside the maternity season. The exclusion method cannot kill bats, cannot seal bats inside, and cannot harm the animals. Working with a licensed pest control company ensures the process is compliant.
How do I know if I have one bat or a colony?
A single stray bat inside your living space is almost certainly an accidental entry, not an established roost. A colony is indicated by: regular evening exit activity from a specific point on your roofline, guano accumulation below entry points, persistent attic odor, and sounds in the attic at dusk and dawn over multiple nights. If you see one bat inside, open a window and give it an exit. If it happens repeatedly, or if you see multiple bats exiting from your roofline at dusk, call for an inspection.
Are Oklahoma bats dangerous?
Bats are not aggressive toward people and will not attack. The primary health concerns are rabies (extremely rare but serious if exposure occurs) and Histoplasmosis from accumulated guano in enclosed spaces. Handle no bat with bare hands. If a bat is found in a room with a sleeping person or a child who cannot reliably report whether contact occurred, contact the Oklahoma Department of Health for exposure assessment guidance.
What does bat guano look like?
Bat guano is small, dark brown to black, and elongated, similar to mouse droppings in size but distinctively shaped. The clearest distinguishing test: bat guano crumbles easily when dry, while rodent droppings remain firm. Guano accumulates in piles directly below the roost site and at the base of the structure below entry points.
How much does bat exclusion cost?
Bat exclusion cost depends on the size of the colony, the number of entry points, the accessibility of the roofline, and whether guano remediation is needed. Homes with a small colony and one or two entry points are substantially less expensive to exclude than large structures with extensive roofline gaps and years of guano accumulation. Alpha Pest Solutions provides free inspections and written estimates. Call (405) 977-0678 to schedule.
Why do bats keep coming back to my attic?
Bats have strong site fidelity and will attempt to return to a previously used roost location for multiple seasons. If exclusion is done correctly, sealing all entry points permanently, re-entry is prevented. If any gaps remain, the colony will re-enter through them. Incomplete exclusion, where only the primary entry point is sealed but secondary gaps are missed, is the most common reason bat problems recur.
What attracts bats to a specific house?
Bats select roost sites based on temperature stability, protection from weather, and proximity to foraging areas. Attics in Oklahoma heat up to 110 degrees or more in summer, which suits maternity colony needs. Older homes with roofline gaps from settling, weathering, or deferred maintenance provide more entry access than tighter newer construction. Homes near lakes, creeks, retention ponds, and greenbelt areas have abundant insect populations nearby, making those locations more attractive foraging territory.
Can I seal bats out myself?
Not legally during the maternity season, and not safely without a full entry point assessment. DIY attempts that seal the primary entry point without addressing secondary gaps typically drive bats to alternative entry points, sometimes deeper into the structure. A professional exclusion includes a complete exterior assessment, confirmed exit monitoring, and permanent sealing of all identified gaps.
Do bats in Oklahoma carry rabies?
All bat species in Oklahoma are potential rabies vectors, though the actual prevalence of rabies in bat populations is low (estimates range from less than 1% to 6% in populations submitted for testing, which are disproportionately bats found on the ground, injured, or behaving abnormally). Any direct contact with a bat, including handling without gloves, or a bat found in a room where someone was sleeping, should be assessed by the Oklahoma Department of Health for potential exposure.
Related Services and Pests
Services:
– Bat Exclusion, our full bat exclusion process, one-way devices, permanent sealing, and post-exclusion monitoring
– Attic Remediation, guano cleanup, contaminated insulation removal, and decontamination
– Wildlife and Rodent Proofing, sealing entry points against bats, rodents, and other wildlife
Bat Species Pages:
– Big Brown Bat, the most common structure-roosting bat in the OKC metro; full identification, behavior, and exclusion guide
Related Pest Pages:
– Bat Bugs, the biting parasite that migrates after bat exclusion; what to expect and how to address it
– Bed Bug vs. Bat Bug vs. Bird Mite Comparison, identification guide for three commonly confused biting pests
– Delusory Parasitosis, if biting sensations persist after bat exclusion and treatment with no confirmed pest evidence
– Other Pests Hub, overview of all wildlife and specialty pest pages
Closing CTA
If bats are in your home, the right time to act is now, so you are ready when the exclusion window opens. A confirmed colony in May needs a plan in place and materials staged for August 16. A colony found in September or October can be addressed immediately.
Alpha Pest Solutions handles bat exclusion throughout Oklahoma City, Edmond, Norman, Moore, Midwest City, and all OKC metro communities. We perform the full exterior assessment, confirm entry points, install one-way exclusion devices, monitor exit activity, and seal permanently. We also assess guano accumulation and provide attic remediation referrals and services when needed.
Call or text (405) 977-0678. Free inspection. Monday through Friday 8am to 6pm. If bats are using your structure, we will tell you exactly what the exclusion process looks like, when it can begin, and what it will cost.