Earwigs in the House in Ontario: Why They Come Inside and How to Stop Them | Sani IQ

Quick answer: Earwigs are showing up in Ontario homes in massive numbers this August 2026 because a mild 2025–26 winter and a wet spring left more of these moisture-loving insects alive and breeding across the GTA. While Health Canada notes earwigs typically start wandering indoors in June and July, populations are now at their absolute peak.

If earwigs are turning up in your bathroom, basement or kitchen right now, the season has shifted. Through June and July earwigs live outdoors in mulch, leaf litter and damp soil. From late August onward, as overnight temperatures start dropping and outdoor moisture becomes less reliable, they begin moving toward the warm, damp margins of your house — and then into it. This is the same seasonal driver that pushes spiders and mice indoors at exactly this time of year, and it runs through to first frost.

Why they show up in basements and bathrooms first

Earwigs are moisture-seeking, and they enter at ground level. That is why the first sightings are almost always in the same three places: a basement floor near the perimeter, a bathroom (around the tub base or under the vanity), and a laundry or utility room. If you are finding them upstairs in a dry bedroom, they are strays that wandered — not an indication the problem has spread.

The entry points are equally predictable: gaps under exterior doors and the garage door seal, window wells that hold damp leaf litter, the joint where a basement window frame meets the foundation, and utility line penetrations, which are common focus areas during pest control in Newmarket. Mulch or soil piled against the foundation and a downspout dumping beside the wall are the two outdoor conditions that reliably produce an indoor earwig problem.

Fixing moisture does more than any spray. Homes backing onto farmland and open field — common through Bradford and the Holland Marsh — see the heaviest late-summer migrations, because there is more outdoor habitat drying out at once. Pull mulch back six inches from the foundation, clear window wells, extend downspouts away from the wall, and run a dehumidifier in a damp basement. Do those four things and most earwig calls resolve themselves.

Earwigs don’t infest — they wander

This is the most useful thing to understand about earwigs, and it is the opposite of how most pest coverage frames them. Earwigs do not establish breeding colonies inside your house the way cockroaches, ants or mice do. They cannot sustain themselves indoors; it is too dry. What you are seeing is migration from outside, one insect at a time, continuously.

That has two practical consequences. First, killing the ones you find indoors accomplishes very little — more will follow the same path tomorrow. The work that matters is at the perimeter: sealing entry points and removing the damp outdoor harbourage against the foundation. Second, an earwig problem ends on its own with the first cool, wet weather in fall, which means an August treatment is buying you six to eight weeks of relief rather than solving something permanent. That is often worth it — but you should know that is what you are buying.

They also do not crawl into ears, they are not venomous, and the pincers cannot break skin on an adult. They are a nuisance and an occasional garden pest, not a health risk.

What’s happening / What to do

What’s happening	What to do
Earwig numbers are up across the GTA after a mild winter and wet spring	Cut moisture indoors and out — fix leaks, run a dehumidifier in basements
Earwigs are at their peak indoor migration now (following their June–July arrival)	Seal gaps around doors, windows, and the foundation
They gather in damp mulch, leaf litter, and debris near foundations	Clear a dry, debris-free perimeter at least 30 cm (1 ft) from the foundation
DIY traps help but rarely clear a heavy infestation	Call Sani IQ to treat the outdoor source and seal entry points

Why are there so many earwigs in Ontario this year?

Earwigs are surging in Ontario in 2026 because the mild 2025–26 winter let more overwintering adults and eggs survive, and an unusually wet spring created the damp conditions earwigs need to thrive. GTA pest control operators are reporting a much more active summer season than in recent years, leading to massive August populations. With warm, humid weather settling in, populations that built up outdoors are now pushing into homes.

Earwigs spend the day hiding in cool, dark, moist spots — under stones, in mulch, in garden debris — and forage at night. After a rainy stretch, those outdoor hiding places get crowded, and the insects start exploring foundations, fences, and walls. That’s when they slip indoors through small cracks.

Late summer is when earwigs stop being a garden problem

The indoor migration is not random. Earwigs need moisture, and as the outdoor sources dry out and cool down they follow humidity gradients toward foundations, window wells, and any point where your house leaks warm damp air.

Where they get in, in order of how often we find it:

- Gaps under exterior doors, especially where a weather sweep has worn thin
- Window wells with accumulated leaf litter sitting against a basement window
- Unsealed gaps around hose bibs, utility penetrations and dryer vents
- Mulch, groundcover or firewood stacked directly against the foundation
- Downspouts discharging within a foot or two of the wall
- Basement floor drains and sump pit lids that do not seal

The fix window is now, not October. Exclusion work done in the last week of August and the first two weeks of September intercepts the migration before it happens. The same work done after they are already inside means you are treating an indoor population and sealing at the same time — more effort, worse result.

Practical order of operations: pull mulch and organic debris back six inches from the foundation, clear window wells, correct any downspout discharging against the wall, replace worn door sweeps, then treat the exterior perimeter. Interior sprays alone do not solve an outdoor population that keeps arriving.

Why September is the worst month, not June

Earwig numbers do not spike in the spring — they build all season. Eggs laid in early spring produce nymphs that mature through July and August, so the population outside your foundation is at its annual maximum right now, in the last week of August and through September.

What changes in September is not the number of earwigs. It is the moisture. Through the summer they live comfortably in mulch, leaf litter, under flowerpots and along damp foundation edges. As the season turns and outdoor humidity becomes unreliable, that habitat stops holding water — and the nearest reliably damp environment is the gap under your basement door, the window well, or the space behind your bathroom baseboard.

That is why homeowners across Ajax, Oshawa and the rest of Durham report the same thing every year: they saw earwigs in the garden all summer and thought nothing of it, then found a dozen inside in one week at the start of September.

The practical consequence is that the useful work is outside, not inside. Killing the ones you find on the bathroom floor changes nothing about the population at your foundation, which is where the next dozen are coming from.

When do earwigs come into Ontario homes?

According to Health Canada, earwigs may begin to wander into homes in June or July as they search for food and shelter. By late summer, as overnight temperatures start dropping, sightings increase as outdoor conditions become less reliable and earwigs move toward homes.

This timing is the key takeaway for homeowners: the bugs you’re seeing now are at the height of their predictable seasonal push, and acting now in August — while populations are at their absolute peak — is critical to bringing the infestation under control.

Are earwigs dangerous to people or pets?

No — earwigs are not dangerous to humans or pets. Health Canada states plainly that, “despite their scary appearance and reputation, earwigs are not directly harmful to humans.” They don’t spread disease, and while their pincers look menacing, they can’t meaningfully harm a person. In gardens they’re often beneficial, eating aphids, slug eggs, and other pests.

The main problems earwigs cause are the “ick factor” of finding them indoors and occasional damage to garden plants, flowers, and soft fruit. They can nibble tender shoots and blossoms, but they’re not a structural or health threat the way some pests are.

How do I get rid of earwigs in my house?

The most effective fix is to treat the outdoor source, not just the bugs you see indoors. Health Canada notes that, “a more effective and long-term solution is to find and treat the outdoor source of the infestation.” That means drying out and clearing the perimeter around your home, sealing entry points, and trapping or treating where earwigs gather — combined with indoor spot treatment for the ones already inside.

DIY traps can knock down numbers, but a heavy or recurring infestation usually needs a professional to locate harbourage sites, seal gaps, and apply registered products safely. Our pest library has more on common Ontario insects.

Steps to keep earwigs out of your Ontario home

These Health Canada–aligned steps target the moisture and shelter earwigs depend on:

1. Dry out the perimeter. Trim back vegetation and create a clean, low-moisture band around your foundation by removing mulch, leaf litter, and debris.
2. Fix the water. Repair leaky taps and downspouts and direct drainage away from your foundation; run a dehumidifier in damp basements.
3. Seal entry points. Caulk gaps around door and window frames, the foundation, and where utilities enter the home.
4. Set simple traps. Roll up corrugated cardboard secured with an elastic, or sink a shallow tin of oil into the soil; check daily and drop captured earwigs into soapy water.
5. Tidy the yard. Don’t let grass clippings, fallen leaves, and old wood pile up near the house.
6. Treat at the right time. Applying control products during warm, dry August evenings when mature earwigs are most active is crucial for knocking down peak populations.
7. Call a pro for persistent problems. A licensed technician can treat the source, seal entry points, and apply products safely around children and pets.

What this means for GTA homeowners in 2026

For Ontario homeowners, the August 2026 earwig peak is a reminder that this summer’s pest pressure is running incredibly high after the mild winter. The good news: earwigs are one of the more manageable pests once you remove their moisture and shelter. Tackling it now — during this late-summer peak — stops a few startling sightings from turning into a steady indoor stream. Sani IQ serves communities across the GTA; see local service details for Barrie and beyond.

Why choose Sani IQ for earwig control

Sani IQ is a licensed, science-based Ontario pest control company with deep local expertise and more than 100 five-star reviews. Rather than just spraying the bugs you can see, our integrated pest management (IPM) approach finds and treats the outdoor source, seals entry points, and uses products registered with a Pest Control Products (PCP) number by the Government of Canada — applied safely around your family and pets. Explore our residential pest control services or view plans and pricing.

Don’t let earwigs settle in

Earwigs may look frightening, but they’re harmless, seasonal, and very beatable — especially when you act decisively to shut down their peak August migration. Dry out the perimeter, seal the gaps, and treat the source, and you’ll keep this summer’s surge outdoors where it belongs.

Seeing earwigs around your home? Call Sani IQ at (705) 302-1887 or request a quote at /contact/. For more seasonal Ontario pest alerts, visit our blog.

Getting ahead of it instead of chasing it

A one-time treatment clears what is here now. It does not change the fact that the same migration happens again next August, and the one after that — the conditions around your foundation are what drive it.

That is why we frame the one-time visit as the starting point and year-round protection as the actual fix. Our General Insect Control plan is $845 per year and is the recommended path, covering scheduled exterior treatments timed to the seasons that matter, including this one. A one-time General Insect Control service starts at $395 exterior or $475 interior and exterior, with a $95 inspection, credited when you book the treatment. One-time services carry a 60-day guarantee.

See how the annual coverage compares on our plans and pricing page, or take the free quote quiz for a fast estimate. In the west end we cover Etobicoke and Oakville — call (705) 302-1887.

Frequently asked questions about earwigs in Ontario

Why are there so many earwigs in Ontario in 2026? A mild 2025–26 winter and a wet spring let more earwigs survive and breed, and GTA pest operators report a highly active summer season that has culminated in this late-August surge. Warm, humid weather is now giving way to cooler, drier outdoor conditions, pushing populations indoors as they seek moisture and shelter, which is why sightings are up across Toronto, Mississauga, Vaughan, and Barrie.

Are earwigs dangerous? No. Health Canada confirms earwigs are not directly harmful to humans. They don’t spread disease, and their pincers can’t meaningfully hurt people. They’re mostly a nuisance indoors and can occasionally damage garden plants, flowers, and soft fruit, but they pose no structural or health threat.

Do earwigs go in your ears? Despite the name and old folklore, earwigs do not crawl into people’s ears to lay eggs. It’s a myth. Earwigs seek cool, dark, moist hiding spots like mulch, debris, and household cracks — not human ears. The occasional rare encounter is purely accidental.

When are earwigs most active in Ontario? While earwigs may first wander into Ontario homes earlier in the season, according to Health Canada, their numbers peak right now through late August.

How do I keep earwigs out of my house? Remove the moisture and shelter they need: clear mulch and debris from the foundation, fix leaks and downspouts, run a dehumidifier, and seal cracks around doors, windows, and the foundation. Health Canada advises treating the outdoor source for a lasting fix; call a pro for heavy infestations.

Should I call an exterminator for earwigs? For a few stray earwigs, perimeter cleanup and traps often suffice. But if you’re seeing them indoors regularly, a licensed operator can find the outdoor source, seal entry points, and apply registered products safely — the most effective long-term solution Health Canada recommends.