The short version
Maine's cold makes a house genuinely worth breaking into, so most problems start in October and get discovered in January. Squirrels and raccoons work the roof edge, bats use gaps at the ridge and chimney flashing, and skunks dig under steps. Identify the animal, evict it, and seal with metal before the next freeze.
- Nuisance wildlife in Maine includes raccoons, squirrels, opossums, skunks, and bats.
- Attics and chimneys are the most common entry points.
- Humane exclusion is the only permanent solution.
- Spring denning and fall are peak seasons for intrusions.
- State regulations protect many species; professional handling is often required.
If you’ve heard scratching in the attic, noticed droppings, or seen animals entering your chimney, this information will help you decide on the best course of action. Whether you’re in Portland, Bangor, or a rural town, the principles apply, but local regulations and animal behaviors vary. For homeowners, property managers, and landlords in Maine who are dealing with or want to prevent wildlife intrusions.
What to look for
Maine spans continental and coastal conditions, with median winter lows around 12F and summer highs near 79F across our city data. Nowhere else in this guide does temperature matter more. A heated attic in January is a survival resource, not a convenience, so animals that get in stay in and defend the space. Gray and red squirrels are the most frequent occupants. They chew through softened fascia and trim, and red squirrels in particular will work a gap at a roof to wall junction until it takes them. Raccoons come next, using porch roofs, dormers, and chimneys, and they open larger holes. Bats use much smaller gaps: flashing seams, ridge vents, and the space where a chimney meets the roof deck. Striped skunks stay at ground level under steps, bulkheads, and sheds. With 47 inches of annual precipitation and humidity near 71 percent, plus repeated freeze and thaw, Maine trim splits and lifts, and each split is a candidate opening.
- 1Scratching, scurrying, or thumping sounds in attics or walls, especially at night (nocturnal animals) or dawn/dusk.
- 2Droppings near entry points, in attics, or on porches. Raccoon droppings are tubular and often contain undigested seeds.
- 3Visible damage: chewed holes in soffits, fascia, or roof edges; torn vent screens; or claw marks on siding.
- 4Strong odors from urine, feces, or dead animals (e.g., a trapped animal in a chimney).
- 5Nesting materials like leaves, twigs, or insulation pulled from walls.
- 6Tracks or footprints in dust, snow, or mud near foundation or attic access points.
- 7Sightings of animals entering or exiting at dusk or dawn, especially from chimneys, roof vents, or under decks.
Why it’s worth acting soon
- Structural damage: chewing wires can cause electrical fires; nesting can block vents and lead to moisture buildup.
- Health hazards: raccoon roundworm (Baylisascaris) can be fatal; bat guano can cause histoplasmosis; skunk spray lingers.
- Increased infestation: one animal can attract others, and opportunistic pests like fleas or mites may follow.
- Cost escalation: small entry points become large holes; exclusion costs rise with damage severity.
- Legal complications: some species (like bats) are protected; improper removal can violate state laws.
Treatment options and typical costs
Inspection with a seasonal plan
Quoted after inspection
A first visit should name the species and then tell you honestly what can be done now versus what has to wait for weather. In Maine that distinction is real: interior work and trapping proceed in winter, but roofline sealing on ice is neither safe nor durable, and a good operator will say so.
- Time
- One to two hours
- Best for
- Every job, especially mid-winter calls
One way door eviction
Quoted after inspection
A door over the active opening lets squirrels or an adult raccoon out and keeps them out. It works well from late summer through fall, which is also when the permanent sealing can follow immediately. In deep winter it is used more cautiously, since an evicted animal will try hard to get back in somewhere.
- Time
- Five to ten days
- Best for
- Adults with no dependent young
Bat exclusion in the permitted window
Quoted after inspection
Bats are excluded rather than trapped, using one way netting over every gap they use. The timing matters, because most northeastern states restrict this work during the summer maternity period when flightless young are present. Ask your operator to state the Maine window in writing before scheduling.
- Time
- Several days plus sealing
- Best for
- Bats in attics, ridge vents, and chimney flashing
Sealing, insulation, and trim repair
Quoted after inspection
Galvanized mesh, new fascia and trim, a chimney cap, and screened ridge and gable vents close the house. Damaged insulation comes out and gets replaced, which in Maine is a heating cost question as well as a sanitation one. This scope belongs on its own line of the estimate.
- Time
- Two to four days
- Best for
- Finishing a job so it holds through winter
Prices are typical published ranges. Ask what’s included before you compare quotes.
Crawl spaces are a favorite den. Check the vent screens and the access door.Understanding Maine's Nuisance Wildlife: Species and Seasons.
Raccoons are the most common nuisance, especially in spring when females seek den sites for their young. They can lift roof shingles and tear through vent covers. Squirrels, both gray and red, are notorious for chewing through wood and wiring in attics, often entering through gaps as small as 1.5 inches. Bats, particularly the big brown bat and little brown bat, form maternity colonies in attics from May to August. Due to population declines, bats are protected in Maine, and exclusion must be done outside the maternity season (typically after August 15). Skunks and opossums are more likely to den under decks, porches, or sheds. Opossums are solitary and rarely cause structural damage but can be a nuisance under decks. Understanding these patterns helps homeowners anticipate and prevent intrusions. Maine's varied climate and geography support a range of wildlife that frequently conflicts with human structures.
wildlife activity by season.
In Maine, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure usually turns up the conditions that are letting them in. Scheduling before the busy stretch, rather than after it, tends to mean faster service and a more accurate quote, and a local provider can point out the conditions that matter most in Maine. The most useful first step in Maine is to note where you have seen wildlife and when they appear, because that timeline is what lets a provider focus on the right area instead of treating the whole property.
Walk the foundation with a flashlight. Gaps at ground level let animals under the house.The Exclusion Process: How Professionals Permanently Solve Wildlife Problems.
The process begins with a thorough inspection to identify all entry points—often more than the homeowner suspects. Professionals look for gaps around chimneys, vents, eaves, and foundations. Once entry points are identified, one-way doors are installed to allow animals to leave but not re-enter. This is crucial for bats and raccoons, as trapping alone may not remove all individuals. After confirming the animals are gone, all entry points are sealed with durable materials like stainless steel mesh or heavy-gauge metal. For bats, exclusion tubes are used, and the process must comply with Maine's timing restrictions to avoid trapping young inside. restoration includes removing contaminated insulation, sanitizing, and repairing any damage. This comprehensive approach ensures the problem doesn't recur. Humane exclusion is the gold standard for wildlife control.
Maine Regulations for wildlife control: What You Need to Know.
Many species, including raccoons, skunks, and opossums, can be trapped and euthanized or relocated by licensed nuisance wildlife control operators. However, bats are protected; only certified bat exclusion companies can perform work, and exclusion is prohibited during the maternity season (June 1 to August 15) in most cases. Gray squirrels are considered game animals and have specific seasons. Additionally, it is illegal to relocate wildlife without a permit because relocated animals often die or spread disease. Homeowners should always verify that their chosen company holds the necessary state permits and follows MDIFW guidelines. Failure to comply can result in fines and ecological harm. Wildlife control in Maine is regulated by the Maine Department of Inland Fisheries and Wildlife (MDIFW).
Health Risks Associated with Wildlife Infestations.
Raccoon roundworm (Baylisascaris procyonis) is a parasitic infection that can be fatal to humans; the eggs are shed in raccoon feces and can become airborne. Histoplasmosis is a lung infection caused by inhaling spores from bat or bird guano. Leptospirosis, spread through urine of infected animals, can cause kidney damage. Squirrels and skunks can carry rabies, though in Maine, rabies is most common in raccoons and skunks. Additionally, ticks and fleas from wildlife can enter homes, spreading Lyme disease and other illnesses. Professional cleanup and disinfection are essential to mitigate these risks. The CDC recommends never handling wildlife directly and always wearing protective gear if cleaning is unavoidable. Wildlife infestations pose serious health risks.
What affects the price
- Type of animal: raccoons and bats often cost more due to regulatory complexity.
- Number of animals: multiple animals or litters increase labor and time.
- Entry point complexity: multiple or hard-to-reach points (roof, high chimneys) raise costs.
- Damage severity: if insulation or wiring needs replacement, costs rise.
- Location: urban vs.rural travel distances affect service fees.
- Seasonality: peak seasons (spring, fall) may have higher demand and pricing.
- Permits and regulations: protected species require special handling, adding fees.
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Which wildlife issue is most common in your Maine home?
When to call for help
A bat found loose inside living space is a specific situation: do not swat it or let it out a window, contain it under a container if you safely can, and call your health office, because testing may be the only way to resolve an exposure question when a bite mark is too small to see. Also call when the noise is above a cathedral ceiling with no access, when the roof is iced, or when insulation has been displaced enough that you can feel the cold difference in the rooms below. Call a licensed operator for bats, raccoons, skunks, and foxes.
What you can do yourself
Prevention in Maine is mostly carpentry and timing. Replace split trim before winter, cap the chimney, screen gable and ridge vents in quarter inch mesh, keep firewood stacked away from the walls, and clear branches back from the roof. Doing this in September is worth more than any product bought in February. Gadgets do not work. Ultrasonic units, lights, and scent repellents have no effect on an animal weighing survival against a 12F night, and every week spent testing one is a week of chewing. The handoff point is anything involving bats or a rabies vector species, anything requiring roof work in poor conditions, and any hole you would be closing without knowing what is behind it. Sealing a squirrel inside a Maine wall in January produces a problem you will still be dealing with in May.
Where you live matters
Maine's geography creates unique wildlife patterns. In southern Maine (Portland, Lewiston, Biddeford), higher population density leads to more frequent raccoon and squirrel issues in older homes with accessible attics. Along the coast, seagulls and pigeons also cause problems. Central Maine (Augusta, Waterville) sees a mix of urban and rural wildlife, with skunks and opossums common under decks. Northern Maine (Bangor, Presque Isle, Caribou) has colder winters, driving animals into structures earlier in fall and staying longer in spring. Moose and bear are rare but possible near wooded areas; these require special handling. The growing season is short, so early spring inspections are critical before animals give birth. City dwellers in Portland should focus on chimney caps and vent screens, while rural homeowners need to secure outbuildings and woodpiles.
Simple ways to keep wildlife away
- Inspect your roof and attic annually for loose shingles, gaps in soffits, or damaged vents.
- Install chimney caps made of heavy-gauge steel mesh to prevent raccoons and squirrels from entering.
- Seal gaps around pipes, cables, and vents with steel wool or caulk; rodents can gnaw through foam.
- Trim tree branches at least 10 feet away from your roof to limit animal access.
- Secure garbage cans with tight-fitting lids and store them in a garage or shed.
- Remove bird feeders in spring and summer to avoid attracting squirrels and raccoons.
- Keep firewood stacked at least 20 feet from your home and elevated off the ground.
Ask which animal it is, how babies will be handled, and whether sealing and cleanup are included.Did you know?
Opossums are largely immune to most snake venom and eat thousands of ticks per season, making them beneficial despite being a nuisance.
By not remembering where they buried nuts, squirrels help create thousands of new trees every year.
A single bat can eat up to 1,200 mosquitoes in an hour.
Questions people ask
What should I do if I find a bat in my house?
Close the door to the room and open a window to let it escape. Do not handle it. If you suspect a colony, call a professional for exclusion. In Maine, bats are protected, so removal must follow regulations.
Can I relocate a raccoon myself?
No. In Maine, relocating wildlife without a permit is illegal. Raccoons must be euthanized or handled by a licensed operator. Relocated animals often die or spread disease. Professional removal ensures compliance.
How do I know if animals are in my attic?
Listen for scratching, scurrying, or thumping, especially at night. Look for droppings, chewed wires, or insulation pulled down. You may also see tracks in dust or hear animals entering at dusk.
What is the best time of year to seal my home against wildlife?
Late summer or early fall is ideal, after young animals have left the nest. Avoid sealing during spring (denning) and early summer (nursing) to prevent trapping young inside.
How much does wildlife control cost in Maine?
Removal typically ranges from $250–$600. Exclusion and restoration can cost $1,000–$2,500.
Are skunks dangerous to have under my deck?
Skunks can spray, causing odor that is difficult to remove. They also dig for grubs and may carry rabies. Professional removal is recommended to avoid spraying and ensure safety.
What is a one-way door?
A one-way door is a device that allows animals to exit but not re-enter. It is used for raccoons, squirrels, and bats. After they leave, the entry point is sealed permanently.
Sources (15)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Wildlife Exterminator · Updated September 11, 2026 · How we write these guides