As Canadian winters grow milder, uninvited guests are making themselves at home. Climate change is redrawing the maps for many household pests, allowing them to survive where they once perished in the cold. Think your northern location protected you from certain creepy crawlies? Think again. Rising temperatures have given a long list of pests a northern passport.
The data tells a troubling story. Over the past 30 years, the overwintering range of common household pests has expanded northward by approximately 250-300 kilometers. This isn’t just a small shift—it’s a massive migration happening right under our noses.
Scientists tracking these changes have observed that for every 1°C increase in average winter temperature, certain pest species can extend their range by up to 100 kilometers northward. It’s like watching a slow-motion invasion, one degree at a time.
The good news? Knowledge is power. Understanding these new patterns helps us prepare and protect our homes with proper timing and techniques. The battle against bugs has new fronts, but we’re not fighting blind.
This list of pests we are keeping an eye on, but are found far enough south that they’re unlikely to spread into Canada anytime soon.
The initial research for this article started with a list of pests that Texan residential exterminators contend with. So in no particular order, the following is a list of household pests whose habitat includes both Canada and Texas.
Subterranean Termites (Reticulitermes) – Powder Post Beetles (Lyctinae) – Old House Borer (Hylotrupes bajulus) – Acrobat Ants (genus Crematogaster) – Pavement Ants (Tetramorium immigrans) – Odorous House Ants (Tapinoma sessile) – Centipedes – Tiger Beetle – Drain flies – Bed bug control – Fleas – Ticks – Mosquitoes – Firebrats and Silverfish treatment – Carpenter Ants – German cockroach – American cockroach – Brown-banded cockroach – Oriental cockroach – Australian cockroach – Millipedes – Yellow garden spider – Long-bodied cellar spider – hobo spider – Long-bodied cellar spider – Yellow garden spider – Cluster flies – Black and yellow mud daubers – Fungus gnats – Blow flies – Indian meal moths (AKA Clothes moths) – Rice Weevils – Grain weevils – Thief Ants – Sawtoothed grain beetle – Carpet beetles
While the European fire ant (Myrmica rubra) is already resident in British Columbia (having first arrived in 2010). Their nastier cousins, red imported fire ants (Solenopsis invicta) have not yet reached British Columbia (Per a CBC report from 2017). They invaded the United States from South America in the 1930s and are relative newcomers to Oregon state.
These aggressive insects build large mound nests in open areas. A single colony may contain up to 250,000 workers, all fiercely defending their territory. These ants have been disrupting ecosystems by outcompeting native species. They damage crops and electrical equipment too.
As its name implies, the both species of ant injects a painful venom when it stings, that can cause severe allergic reactions in some people. The imported red fire ant is considered “a human health hazard due to its aggressive behavior and painful sting,” says Purdue University. Taking swift action against these unwelcome guests is recommended for protecting your family and home.
The Striped Bark Scorpion stands out as one of North America’s most widespread scorpion species. Native to the southern United States and northern Mexico, these yellowish arachnids sport two dark stripes along their backs—hence their name.
Don’t let their small size fool you. These scorpions pack a painful punch! Their sting causes intense burning, numbness, and swelling. While rarely fatal to humans, it’s no picnic in the park. Kids and elderly folks should take extra care around these critters.
These hardy survivors thrive in harsh desert conditions. They hide under rocks, logs, and bark during blistering days. At night, they emerge to hunt insects, spiders, and even other scorpions.
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Their remarkable adaptability has helped them spread into urban areas too. Finding one in your shoe isn’t just bad luck—it’s their smart survival strategy. They seek warm, dark spaces to shelter.
Despite their fearsome reputation, these scorpions play an important role in controlling pest populations. Without them, we’d have way more creepy crawlies to deal with. Sometimes the scary neighbors make unlikely pest control treatment!
This genus is found in Canada, but the species with high fatality rates is currently an American exclusive far from the Canadian border. Its glossy black body sports the famous red hourglass marking—nature’s warning sign.
The two species found in Canada are less venous and have limited range. But with warmer temperatures from climate change, their range is expected to expand.
Information on climate change impact on venom potency is hard to find, but neither of these two species are expected to have significant Canadian fatality rates in the future. Because historical documentation on fatality rates include bites for the entire species, notably including those in US states. Which is warmer than the average Canadian temperatures, even after global warming.
So the thing to watch for is whether the Southern black widow expands their range into Canada. Which is unlikely, but who knows what a few decades of climate change will bring. If it comes about we’ll be ready with the appropriate spider pest control options!
The Western Widow can be found from British Columbia to Manitoba and most of western USA. No fatalities in recent decades have been documented. Distant cousins of their deadlier southern relatives, they’ve adapted to cooler climates.
To avoid predation by birds, widows hunt at night, spinning irregular webs to catch prey. These shy arachnids prefer wooden hideaways. So watch your step in woodpiles! They’re not out to get you! These shy creatures bite only when threatened.
The Northern Black Widow spider lurks in dark corners across Southern Ontario and North Eastern USA. Despite their fearsome reputation, their bites pack a punch but aren’t usually fatal. Only infants and elderly folks are at fatal risk.
But if you suspect you have been bitten, seek medical attention immediately! Bite symptoms include painful swelling around the bite, cramps, muscle spasms, nausea, and achiness.
Most widows prefer quiet, dark spots. Check your garden shed, woodpiles, and basement corners. These eight-legged neighbors aren’t looking for trouble, but they’ll defend themselves if cornered.
These dangerous arachnids lurk throughout much of the eastern United States. They range from New York’s southern regions down to Florida and stretch westward across Texas, Oklahoma, and Kansas.
Despite their scary reputation, Southern Widows rarely kill humans. Of the roughly 2,000 bites reported yearly in the US, only about 7 prove fatal—a death rate of just 0.35%.
Their venom packs a punch, though. Symptoms include muscle cramps, nausea, and sweating. Seek medical help immediately if bitten.
The Asian longhorned tick invaded North America in 2017, causing alarm among health officials. This tiny troublemaker hails from East Asia but has spread rapidly across the United States.
Unlike other ticks, females can reproduce without mating—one tick can lay up to 2,000 eggs! This reproductive superpower helps them infest areas quickly. They attack livestock in overwhelming numbers, sometimes causing fatal blood loss.
These ticks carry serious diseases including spotted fever and a virus that causes severe fever with thrombocytopenia syndrome (SFTS). For farmers, they spell financial headaches through reduced milk production and damaged hides.
Prevention requires regular tick checks on pets and livestock. Apply approved repellents before outdoor activities. Clear tall grasses around your property to limit tick habitats.
Climate change may worsen their spread across more states. Scientists are working double-time to develop better control methods. The threat they pose requires attention from researchers, farmers, and the public alike.
The Carolina wolf spider stands as North America’s largest wolf spider. These impressive arachnids can grow up to 1.5 inches in body length. They don’t build webs. Instead, they hunt prey directly on the ground.
Brown with subtle striping, these spiders blend perfectly with soil and leaf litter. Their eight eyes form a distinctive pattern—two large ones on top, with smaller eyes below. This arrangement gives them excellent vision for nighttime hunting.
Despite their fearsome, very large appearance, they rarely bite humans. When they do, it feels like a bee sting. No medical attention needed!
Range within Montana Primary Source
Female Carolina wolf spiders carry their egg sacs attached to spinnerets. After hatching, babies climb onto mom’s back for protection. Talk about piggyback rides!
These hunters control pest populations in gardens and fields. They feast on crickets, beetles, and other small insects. Consider them your garden’s natural pest control squad.
Wiki Source (User Contributed Info)
Found across the eastern United States, they prefer dry, open habitats. Look for them in sandy areas, grasslands, and forest edges. Just shine a flashlight at night—their eyes gleam like tiny diamonds in the dark!
Any Smokybrown cockroaches found in Canada are unwitting travel passengers in your suitcases. While there are a few spots this pest is very close to the Canadian border, the current outdoor habitat range of this pest is exclusive to the USA. With the exception of a small, recent invasion of the Vancouver and Victoria area.
Smoky brown cockroaches are large insects, typically 1-1.5 inches long. Their dark mahogany color sets them apart from other household pests. These nocturnal creatures prefer warm, humid areas with plenty of food sources.
Unlike their cousins, smoky browns need higher moisture levels to survive. They often enter homes during dry spells, searching for water. You’ll find them in attics, crawl spaces, and around plumbing fixtures.
These pests breed fast! A female can produce up to 32 offspring every time she reproduces. Their eggs develop inside protective capsules called oothecae, with each containing about 20 eggs.
Outdoors, smoky browns hide in mulch, woodpiles, and tree bark. Inside, they gravitate toward damp areas. Leaky pipes or humid bathrooms? That’s prime real estate for these critters!
“My garage became a cockroach hotel last summer,” jokes pest control expert Tom Wilson. “They checked in but wouldn’t check out!”
Keep your home dry. Fix water leaks promptly. Store food in airtight containers. Seal cracks around windows and doors to block entry points.
Remove leaf piles and wood debris near your house. Trim branches that touch your roof or walls. These simple steps make your property less attractive to these unwanted guests.
For serious infestations, professional cockroach pest control offers the best results. The right treatment can stop these pests in their tracks.
The following is a list of pests In Southern & Middle Latitude US states whose habitat isn’t expected to expand inside Canada in the near future. But something to watch out for as climate change continues.
The brown recluse spider prefers dark, quiet places. These small arachnids hide in closets, under furniture, and in cluttered garages. You’ll spot them by the violin-shaped mark on their back—earning them the nickname “fiddle-back” spiders.
Don’t let their modest size fool you. Brown recluse venom packs a punch. Their bite can cause tissue death in a process called necrosis. The skin around the bite might turn blue-purple, then form an open sore.
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These spiders aren’t aggressive hunters. They’d rather run than fight. Bites typically happen when someone accidentally presses against one hiding in clothing or bedding. Most folks never see the spider that bit them.
Prevention beats panic. Shake out stored clothes and shoes. Keep beds away from walls. Clear clutter from storage areas. Seal cracks in your home’s foundation.
If bitten, clean the area with soap and water. Apply ice to reduce swelling. Seek medical help right away, especially if symptoms worsen.
Despite scary stories, deaths from brown recluse bites are extremely rare. These shy creatures just want to be left alone—like that odd neighbor who never comes to block parties. With basic precautions, humans and brown recluses can share space without drama.
Maize weevils are tiny, but don’t let their size fool you. These little pests can wipe out an entire grain stash faster than you can say “cornbread.” They attack stored grains like maize, rice, and wheat. Once inside, they chew through kernels and leave behind powdery mess—kind of like finding sawdust in your cereal box.
Females lay eggs inside the grain itself. That’s right—inside! The larvae grow safe and hidden, feeding until they’re ready to break free. By the time you spot them, the damage is often done. If you’ve ever opened a bag of rice to find holes and dust, you’ve probably met one.
Signs of Infestation: Look for tiny holes in grains, fine powder, or even live weevils crawling around. These pests are great at hiding, so a close look is worth it—think of it like playing detective in your pantry.
Control Tips: Keep grains in airtight containers. Regularly check stored food. If you find weevils, toss the infested grains and clean the storage area well. Sometimes freezing the grains for a few days helps too—nature’s way of hitting pause.
No one wants to share dinner with a weevil, so staying alert can save your pantry—and your appetite!
Dark rover ants are tiny, sneaky invaders. About the size of a grain of sand, these ants slip into homes through the smallest cracks. You may spot them marching along windowsills or kitchen counters, especially near sinks. They love moisture, like that leaky faucet you’ve been meaning to fix.
Unlike other ants, dark rover ants don’t care much for your crumbs. They’re more interested in sweet liquids—think soda spills or syrup drips. And once they find a food source? Good luck. They’ll keep coming back like uninvited guests who never take the hint.
Distribution of Brachymyrmex patagonicus Mayr
in the United States as of 2008. Primary Source
One reason these ants are hard to control is that they build nests almost anywhere—under mulch, in wall voids, or even potted plants. If you’ve ever wondered why spraying them only makes them scatter, it’s because their nests are scattered too.
Dark rover ants don’t bite or sting, but they can drive you up the wall with how persistent they are. Like a bad song stuck in your head, they just won’t quit.
If you’re dealing with dark rover ants, don’t wait. Get proper ant control before they make themselves too comfortable. Because once they settle in, they’re harder to kick out than a freeloading roommate.
Tawny crazy ants didn’t get their name for nothing. These little pests move fast and wild, like someone dropped a bag of marbles. Unlike fire ants, they don’t sting, but they do bite — and in swarms. If you’ve ever watched a horror movie where bugs take over, you’ve got the right idea.
They love moisture and electricity. Yep, they’ve been known to short out air conditioners and fry circuits. Imagine calling an electrician, only to hear, “Looks like ants chewed your wires.” Not exactly a fun day. These ants also outcompete other ants, even fire ants. So if you think, “Hey, at least they’re getting rid of fire ants,” think again — they bring a bigger problem.
You’ll often find them in walls, under floors, or crawling out of sockets. They build huge colonies with multiple queens, which makes wiping them out a nightmare. Spraying a few won’t solve it — they’ll bounce back fast.
If you’re seeing them indoors, it’s time to act. Baits and sprays need careful placement. And yes, calling a pro might be your best bet. Because when ants go wild, you need a plan — and maybe a sense of humor to survive it.
Ever walked into a room and thought, “Great, now I’m Indiana Jones, dodging cobwebs”? You might have a Southern House Spider nearby. These spiders are big, sometimes stretching over two inches with their legs. But here’s the kicker — despite their size and dark brown color, they’re harmless to people.
Females like to stay put. They build thick, messy webs in window corners, attics, or under eaves. Males, though, roam around like they’ve got places to be. This is usually when people spot them — crawling up walls or hanging out in bathtubs. They’re just looking for love, not trouble.
Southern House Spiders look like brown recluses, but don’t let that fool you. They don’t have the violin-shaped mark on their backs, and they aren’t venomous to humans. If you squish one out of fear, you’ll probably feel worse than the spider did.
They help control pests like flies, roaches, and moths. So, if you can stand a roommate with eight legs, they’re actually doing you a favor. Still, if webs everywhere aren’t your style, sealing cracks and keeping outdoor lights off at night can help keep them away.
While these three pests are found in Canada. We still felt compelled to mention them because of their destructive nature, and impending climate induced habitat expansion.
While there are at least three termite species who are Canadian natives—several additional termite species in the USA have not yet entered Canada—and warmer temperatures will expand activity of current Canadian pests.
Subterranean Termites (Genus: Reticulitermes) with three (3) Canadian species included. Eastern Subterranean Termite (Reticulitermes Flavipes), Western Subterranean Termite (Reticulitermes Hesperus), Pacific Dampwood Termite (Zootermopsis angusticollis).
Secondary info Source – Primary info Source
Subterranean termites are silent destroyers that can wreak havoc on your home without you noticing until serious damage occurs. These pests chew through wood 24/7, potentially causing structural failure and thousands in repair costs. They build mud tubes to access your home and can slip through cracks as thin as a credit card. Once established, colonies can contain millions of termites, making elimination difficult and expensive.
A single colony can devour several pounds of wood per week. Your homeowner’s insurance likely won’t cover termite damage, leaving you with the full financial burden. Their presence also significantly decreases property value and can complicate home sales.
On the flip side, these insects do play important ecological roles. They break down dead wood in forests, recycling nutrients back into soil. Their tunneling activity aerates soil, helping plant growth. In nature, termites actually contribute to biodiversity by creating habitats for other organisms.
But let’s be honest—you don’t want these tiny wrecking crews anywhere near your biggest investment. The risks far outweigh any environmental benefits they provide elsewhere.
Powder post beetles are tiny wood-boring insects that can cause significant damage to homes and furniture. These pests, belonging to the subfamily Lyctinae, earned their name from their habit of reducing wood to a fine, flour-like powder.
The subfamily Lyctinae is a group of seventy species, many of whom are currently American exclusive. The most common species of powderpost beetle native to Canada is Lyctus brunneus.
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Adult beetles measure only 1/8 to 1/4 inch long. They’re reddish-brown to black and have elongated bodies. Don’t let their small size fool you! These critters pack a destructive punch.
These beetles attack hardwoods with high starch content. Oak, ash, hickory, and bamboo top their menu. They avoid softwoods like pine and cedar.
The lifecycle begins when females lay eggs in wood pores. After hatching, larvae tunnel through the wood, creating extensive galleries. This feeding frenzy can last 1-5 years. The damage often goes unnoticed until adults emerge, leaving tell-tale exit holes.
Signs of infestation include:
Prevention beats cure to control these beetles. Keep wood moisture below 20%. Apply varnish or paint to seal wood surfaces. This blocks egg-laying sites. For active infestations, treatments include heat, fumigation, or borate solutions.
Regular home inspections offer the best protection against these silent destroyers. Check wooden items carefully before bringing them home. These beetles might be small, but they’re mighty household foes!
While the old house borer is not native to Canada, over the years it has achieved worldwide domination. Pinky and the Brain would be proud! Records confirm its presence in British Columbia, Ontario, and Quebec.
These beetles are black to brown with distinctive gray hairs forming two patches on their thorax. Adults grow to 1/2 to 1 inch long. Despite its name, it often attacks newer structures, not just old houses. With a particular taste for softwoods in buildings.
The larvae cause the real damage. These cream-colored grubs chew through wood for 3-12 years before becoming adults. They create oval exit holes about 1/4 inch wide when they emerge. If you press your ear against infested wood, you might hear them munching away – like tiny carpenters working overtime!
Wood damage appears as tunnels filled with powdery frass (bug poop). The beetles prefer roof timbers, floor joists, and other structural pine or spruce.
Treatment options include:
Prevention beats treatment every time. Keep wood dry and sealed. Check lumber before bringing it home – those beetles hitch rides! Professional inspection during home buying can save massive headaches down the road.
Remember: that creaking might not be your house settling. It could be these tiny tenants remodeling without permission!
Terminix Canada is one of the most trusted pest control service providers in the nation. With over 90 years of experience, our teams work 24/7 across Canada to keep homes and businesses pest-free.
Our government-licensed technicians don’t mess around. They use proven methods to eliminate pests and prevent them from coming back. We’re so confident in our work that we offer a 100% satisfaction guarantee.
From ants to cockroaches, birds to rodent pests – we handle it all. Our protection covers creatures that threaten both property and health. With branches in 10 Canadian provinces, we’ve got you covered no matter where you call home.
Size doesn’t matter – whether your problem is big or small, we have solutions. Our team consists of skilled problem solvers who’ve seen and fixed every type of infestation imaginable. Each situation gets personalized attention and an eco-friendly approach that minimizes environmental impact.
When pests move in, your peace of mind moves out. Let Terminix Canada bring it back. Remember, with us on watch, those unwanted guests have nowhere to hide!
Got pests? Don’t sweat it. Terminix Canada stands ready to tackle your pest problems with speed and precision.
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99 Locke St Unit #1
Concord, ON L4K 0J2
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