Crickets in the Basement: Why They Move In Every Ontario Fall (and How to Get Them Out)

Quick answer: Crickets move into Ontario basements in September and October because outdoor nights drop below about 10°C and your foundation is the warmest, dampest shelter within hopping distance. The one most Ontario homeowners actually find is the camel cricket — humpbacked, long-legged, silent, and drawn to moisture. Getting rid of them is a two-part job: dry the space out (dehumidifier, downspouts, grading) and seal the ground-level gaps they came through. Sprays alone fail because they don’t touch the entry points. Sani IQ starts every basement job with a $95 inspection, credited when you book the treatment — call (705) 302-1887.

There is a specific week in an Ontario fall when the basement stops being yours. Nights slide under 10°C, the furnace hasn’t really kicked in, and suddenly there is something long-legged sitting on the concrete beside the laundry tub that jumps at you instead of away from you. That is almost always a cricket, and it is almost always a camel cricket.

It is one of the most-searched pest questions in Ontario every September and October — and one of the few where nearly every article a homeowner finds was written for a basement in Ohio or Surrey. Ontario basements are their own problem: unfinished concrete block, a sump pit, a cold room, a window well that fills with leaves, and a grade that settled toward the house sometime in the last thirty winters. Here is how it actually works here.

The three crickets you might be looking at

Getting the ID right changes what you do next.

Camel cricket (also called a spider cricket or cave cricket). This is the basement one. Humpbacked, tan to mottled brown, no wings, absurdly long back legs and even longer antennae. It does not chirp — camel crickets have no sound-producing wings at all. It jumps toward movement, which is a defensive reflex and the single reason most people describe finding one as an event rather than an observation. It wants damp and dark: sump pits, crawl spaces, cold rooms, the underside of stored cardboard.

House cricket. Lighter, yellowish-brown, with three darker bands across the head, and fully winged. This is the one that chirps all night from behind the water heater. It tolerates dry warmth better than a camel cricket and is the species most likely to be found upstairs.

Field cricket. Big, glossy black, the cricket you see on the driveway at dusk. Field crickets are outdoor insects that wander indoors by accident in the fall and generally do not establish — they die off in the house within a couple of weeks without breeding. Finding one is not an infestation.

The University of Maryland Extension and NC State Extension both have clean side-by-side identification photos if you want to confirm what you’re holding a jar over. If it has no wings and a humped back, it’s a camel cricket, and moisture is your real problem.

Why they move in every Ontario fall

Crickets are not trying to get into your house. They are trying to not freeze, and your foundation is the nearest place that qualifies.

Through the summer, camel crickets live under mulch, in leaf litter, beneath woodpiles and landscape timbers, along the damp strip of soil against the foundation where the sprinkler and the roof runoff keep things permanently humid. When overnight lows start hitting single digits in late September, that outdoor habitat cools and dries faster than the ground-floor perimeter of a heated house. Everything in that strip of soil starts moving toward the warm, humid gap — which is the same reason earwigs, centipedes, springtails and millipedes all arrive in the same three-week window. Crickets are a moisture pest first and a cold-weather pest second. Cornell’s IPM program groups them exactly that way, with the other moisture pests.

That’s the useful part: if you have crickets in the basement, you have a moisture reading you didn’t know you had. Homes in older Barrie and Orillia neighbourhoods with block foundations and original grading get them worst. So do newer Vaughan and Oakville subdivisions where the builder’s grading has settled and the downspout discharges eighteen inches from the wall. Different housing stock, same physics.

Do crickets actually damage anything?

Mostly no — with one real exception.

Field and house crickets indoors are a nuisance and a noise. They don’t bite, they don’t carry disease of consequence to people, and they don’t damage structure.

Camel crickets are the exception worth knowing about. They are opportunistic chewers and in a basement with stored fabric they will feed on cardboard, paper, and natural-fibre textiles — the classic finding is small irregular holes in stored clothing or a box of photographs, blamed on mice or moths. In a damp storage room with a large population, that damage is real and it accumulates quietly over a winter. The “crickets eat your clothes” line gets repeated online in a much more alarming form than reality supports, but “camel crickets in a damp storage room will chew stored paper and fabric” is accurate.

The other honest answer: a large cricket population in a basement is a food supply. Cellar spiders and centipedes build up around it. Most of the time, people call us about the spiders.

What the chirping means

Only male crickets chirp, and only house and field crickets — they rub a scraper on one wing against a file on the other to attract females. Camel crickets are silent. So a chirp behind the furnace means house crickets, which means a somewhat drier situation and usually a smaller, more localized problem. Silence plus sightings means camel crickets, which means moisture.

Chirp rate rises with temperature, which is why the sound gets faster and more insistent as the furnace runs harder through October. That is not more crickets. That’s the same ones getting warmer.

Getting them out — and keeping them out

In order of what actually works:

1. Drop the humidity. A dehumidifier in an unfinished basement, run to hold relative humidity around 50%, makes the space inhospitable to camel crickets faster than any spray. This is the step people skip and the reason crickets come back in November after a treatment.

2. Fix the water outside before you fix the bugs inside. Extend downspouts at least six feet from the foundation. Clear leaf litter, mulch and stacked firewood back from the wall. Re-grade any spot where soil slopes toward the house. Clean out window wells — a leaf-packed window well is a cricket nursery pressed directly against a basement window.

3. Seal the entry points. Ground-level gaps are the whole game: the gap under a basement door, an unsealed sill plate, the sleeve where the AC line or hose bib enters, torn window-well screens, and cracks in block or parge. Backer rod and sealant for gaps, copper mesh or coarse steel wool packed into utility penetrations, new sweeps on basement and garage doors.

4. Clear the harbourage inside. Cardboard on a concrete floor is the ideal camel cricket habitat — damp underside, dark, edible. Move storage to sealed plastic bins on shelving off the floor.

5. Then treat. A perimeter application of reduced-risk product along the foundation exterior and interior ground level intercepts what’s still moving in while the exclusion work holds. Treatment after exclusion works. Treatment instead of exclusion is money you spend again next fall.

The part that matters more than crickets

Everything in that list is also mouse-proofing. The gap a camel cricket walks through is the leading edge of a gap a mouse can work open, and mice are moving on the exact same calendar — Ontario’s rodent ingress window runs from the first cold nights through early December. If you’re sealing a basement perimeter in late September, you are either doing it once for crickets and mice together, or doing it twice. Our cottage closing pest checklist covers the same perimeter work for seasonal properties, and the full range of fall pests we treat shows how much of this overlaps.

That’s the honest argument for a plan rather than a one-off. A single cricket treatment solves September. It does nothing for the mice arriving in October, the cluster flies in the south-facing walls in November, or the crickets that repopulate from the same damp soil next fall. Sani IQ Essentials at $1,195 covers the perimeter year-round — every seasonal pressure point, scheduled, with the exclusion work maintained rather than done once and forgotten. General Insect Control at $845/year is the narrower version if crawling insects are the whole concern.

One-time service is the right entry point when you need the current population gone this week. It just isn’t a prevention strategy, and we’d rather say that plainly than sell you the same visit every September.

What it costs

Every Sani IQ job starts with a $95 professional inspection, credited in full when you book the treatment. The inspection is where we find the actual entry points and the moisture source — with crickets, that’s most of the value.

• General Insect Control: from $395 exterior, $475 interior and exterior. Covers crickets along with the rest of the fall crawling-insect group.
• General Insect Control plan: $845/year.
• Sani IQ Essentials: $1,195/year — broader coverage, scheduled seasonal visits.
• VIP: from $1,395/year.

One-time services carry a 60-day guarantee. There is no initiation fee, no setup fee and no monthly billing.

Sani IQ is owner-operated, BBB Accredited, licensed under the Ontario Pesticides Act, registered with the Ministry of the Environment, Conservation and Parks, carries $5M liability coverage, and holds a 5.0 rating across 126 Google reviews. Our technicians are employed, licensed and background-checked — never subcontracted.

We handle basement and foundation work across Barrie, Vaughan, Oakville and the wider GTA and Simcoe region. See our full residential pest control services, or call (705) 302-1887.

FAQ

Are camel crickets dangerous? No. They don’t bite people, sting, or transmit disease. They’re startling because they jump toward movement rather than away from it, and in large numbers in a damp storage area they’ll chew cardboard and natural-fibre fabric.

Why do I only see crickets in the fall? Because that’s when outdoor temperatures drop below what they can tolerate and your foundation becomes the warmest humid shelter available. They’ve been living in the soil and mulch against your house all summer.

Will a dehumidifier alone get rid of them? It will substantially reduce the population over a few weeks by making the space unsuitable, but it won’t stop new ones entering through open gaps. Dehumidifier plus sealing is the combination that holds.

Do ultrasonic repellers work on crickets? No. There’s no credible evidence ultrasonic devices repel crickets or any other structural pest. Moisture control and physical exclusion are what change the outcome.

Is one cricket in the basement a problem? One field cricket in October is an accident. Repeated camel cricket sightings over a week or two mean there’s an established population in a damp area and an open route in.

How fast can you come out? Most of our service area gets same-week scheduling, and same-day is often available. Call (705) 302-1887 or use the free quote quiz to get a real price in about a minute.