Top 5 Winter Pests in Southern Maine and How to Stop Them

As an expert in pest control in Southern Maine, Precision Pest Control understands that winter does not mean a break from pests. Mild winters in 2026, with fewer deep freezes, can extend pest activity and allow more overwintering survivors. Common winter pests in Southern Maine invade homes seeking warmth, food, and shelter, leading to health risks and property damage. In this guide, we highlight the top 5 winter pests affecting Cumberland and York Counties, including areas like Portland, Scarborough, Saco, Westbrook, Standish, Kennebunk, Biddeford, and Old Orchard Beach. Learn how to prevent them and when to call a professional. Contact me for a free consultation.

1. Rodents (Mice and Rats)

Rodents are the most common winter invaders in Southern Maine. They seek indoor shelter as temperatures drop, often entering through small gaps. In York County, rodent activity surges in winter due to mild conditions increasing survival rates.

Problems They Cause: Chewed wires (fire hazard), contaminated food, and disease spread (e.g., salmonella).

Prevention Tips:

• Seal gaps larger than 1/4 inch with steel wool or caulk.
• Store food in rodent-proof containers and clean up crumbs.
• Keep firewood stacked away from the house and trim vegetation.
• Use traps in attics and basements.

A recent case in Windham showed early action prevented major damage. For ongoing issues, professional help is essential. Try my rodent control services.

For more on rodent prevention, see the EPA’s guide.

2. Ticks (Especially Deer Ticks)

Ticks remain active in Southern Maine winters whenever temperatures rise above freezing. Mild 2026 winters with fewer freezes could lead to increased tick encounters. They hitch rides indoors on pets or people from wooded areas.

Problems They Cause: Disease transmission, including Lyme disease and anaplasmosis.

Prevention Tips:

• Check yourself and pets after outdoor time, focusing on hidden areas.
• Use EPA-approved repellents on skin and clothing.
• Maintain yards by removing leaf litter and creating borders.
• Treat pets with vet-recommended preventives.

Ticks can survive cold snaps under snow. Explore my tick control solutions.

See the Maine CDC’s tick info.

3. Spiders

Spiders are common winter pests in Southern Maine, moving indoors to escape the cold. They often hide in basements, attics, and corners, with species like house spiders becoming more visible.

Problems They Cause: Bites (rare but possible), webs creating messes, and fear factor for many homeowners.

Prevention Tips:

• Seal cracks in foundations, windows, and doors.
• Reduce clutter in storage areas to eliminate hiding spots.
• Vacuum regularly, including corners and ceilings.
• Use sticky traps in dark, undisturbed areas.

Spiders help control other insects but can become a nuisance indoors. Contact me for spider control.

For more on household spiders, refer to UMaine Extension resources.

4. Ants (Especially Carpenter Ants)

Some ant species overwinter indoors in Southern Maine, staying active in warm homes. Carpenter ants can nest in damp wood, emerging on mild winter days.

Problems They Cause: Structural damage from tunneling, food contamination.

Prevention Tips:

• Seal entry points around pipes and foundations.
• Fix moisture issues like leaks.
• Store sweets and proteins in sealed containers.
• Use baits near trails.

Mild winters mean more ant survival. Learn about my ant services.

5. Wildlife (e.g., Squirrels)

Wildlife like squirrels seek attics and chimneys in winter for nesting. They are common in suburban Southern Maine, causing noise and damage.

Problems They Cause: Chewed insulation/wires, droppings spreading disease, entry holes for other pests.

Prevention Tips:

• Install chimney caps and vent screens.
• Trim tree branches away from roofs.
• Seal attic vents with hardware cloth.
• Use humane traps if needed.

Professional removal is safest. Contact me for wildlife control.

For more, see Maine Forest Service’s pest index.

Summary Table of Top 5 Winter Pests

FAQs on Winter Pests in Cumberland and York Counties

1. Why are pests active in winter in Southern Maine? Mild winters allow survival and activity above freezing.
2. How do I know if I have rodents? Look for droppings, gnaw marks, or noises in walls.
3. Are ticks a winter risk? Yes, on warmer days above freezing.
4. Can ants be active indoors in winter? Yes, in warm, moist areas.
5. How to schedule help? Visit my contact page.

Updated February 2026. For expert pest control in Southern Maine, contact us today.