Sadia Afrin
On a chilly winter morning in the GTA, our phones buzzed with one urgent question:
“We keep seeing ants and stink bugs inside, even though it’s freezing outside. Are they dead, or should we worry?”
Toronto homeowners often assume insects disappear during the cold months, but many pests hide indoors to survive the winter, quietly waiting until spring. At Insectica Pest Control, we help families understand winter pests, prevent infestations, and keep homes safe.
Tiny Openings, Big Problems: How Rats Squeeze Through Small Holes
Rats have flexible bodies with no collarbones, allowing them to fit through openings their head can pass through. An adult rat can squeeze through a gap the size of a quarter, while young rats can fit through even smaller cracks. (ontario.ca)
Carpenter ants and pavement ants are common winter intruders in Toronto. Normally, ant colonies hibernate deep underground, but heated structures like houses can lure them inside.
Left unchecked, indoor ant colonies can forage, expand, and even damage wood, creating long-term structural and hygiene issues (Ontario Ministry of Agriculture).
Brown marmorated stink bugs are increasingly common in Toronto. They spend summer outdoors but seek warmth indoors during fall.
Stink bugs enter diapause, remaining dormant but occasionally becoming active near heat sources. Though harmless in terms of biting or stinging, they emit a foul odor if crushed, making removal unpleasant.
Prevention and gentle removal (vacuuming or capture) are usually the best approaches (Government of Canada – Stink Bugs).
Many insects shelter indoors during Toronto winters, including:
These pests often remain dormant in attics, walls, or ceilings and emerge during brief warm spells. While not dangerous, they are nuisances and may indicate larger populations inside your home.
House spiders and outdoor spiders also seek warmth:
They feed on smaller insects, so seeing spiders indoors may hint at other pest activity. Toronto’s local spiders are harmless, but their webs and presence can be unsettling (Toronto Public Health – Spiders).
Even well-sealed homes have tiny entry points:
Once inside, insects move to warm, hidden spots, surviving on indoor heat and moisture.
Our goal: treat pests AND educate homeowners to prevent future infestations.
From ants hiding behind walls to stink bugs snoozing in attics and spiders setting up camp in basements, Toronto homes are a winter refuge for many pests.
We proudly serve the entire Greater Toronto Area. No matter where you are, our technicians are nearby and ready to help.
Insectica is here 24/7, always ready to help Toronto fight back.
Written By
Pest Control Specialist at Insectica Toronto
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