Ant Control in Scarborough

Store spray never ends an ant problem for one reason: it drops the ants on the counter and never reaches the queen or the colony behind them. Scarborough homes see three regular indoor ants, pavement ants, odorous house ants, and pharaoh ants, and all three are beaten from the nest outward, using bait the workers haul back to the queen instead of a poison line at the threshold. A typical Scarborough ant job sits at $150 to $300, wraps up in a single visit plus a check-in, and carries our two-month guarantee. The season here runs April into September, and a trail crossing the counter in May is the cheap call to make.

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Why you have ants, and why it is almost always spring to summer

Two things pull ants indoors: food and water. In Scarborough the clock starts in April, as the ground warms and the colony stirs, and it stays busy right through September. A scout finds the crumbs behind the toaster or the damp under the sink, drops a scent trail, and the rest of the colony marches the line behind it. That "sudden invasion" is really one outdoor nest deciding your kitchen is the nearest corner store.

The species sets the plan. Pavement ants nest under walkways, driveways, and slab foundations, which describes half the postwar bungalows and back-splits across Bendale, Wexford, and Dorset Park, and they push up through cracks in the concrete. Odorous house ants throw off a rotten-coconut smell when crushed and chase moisture, so they surface near dishwashers and leaks. Pharaoh ants are the difficult ones: tiny, pale yellow, nesting deep inside wall voids and heated buildings, and common in the apartment towers and condos along Kingston Road, Eglinton East, and up at STC.

Spraying pharaoh ants makes them worse, because the colony splits and scatters new nests through the building, a process called budding. That single fact is why the store can of spray backfires on the one ant that most needs a professional.

The signs it is ants, and which kind

• A steady trail of ants along a baseboard, counter edge, or windowsill, running to and from one point. A trail means a nest, not a stray.
• Ants around water: under the kitchen sink, behind the dishwasher, near a bathroom pipe. Odorous house ants in particular follow moisture.
• A faint rotten smell when you crush one. That is the odorous house ant, named for exactly that.
• Tiny pale-yellow ants in a hospital-like spread through a condo or apartment, in bathrooms and kitchens at once. That points to pharaoh ants, and it needs baiting, never spray.
• Small piles of soil pushed up between paving stones or along the foundation, the sign of a pavement ant nest below.

If the ants are large and black and you are finding coarse sawdust, that is a different problem. Read the carpenter ant control page, because those nest in your wood and the treatment is not the same.

Why the store spray fails, and what actually works

Aerosol drops the foragers it touches and lays down a repellent line the survivors just walk around. Meanwhile the colony keeps pumping out hundreds of fresh workers and the queen never encounters the product. You wipe out the trail for an afternoon, and it is back by Saturday.

Bait flips that logic. Workers carry a slow-acting bait home and feed it to the queen and the brood before it kicks in, so the colony collapses from the centre out. It is meant to look slow for the first few days. Here is how we run it:

1. Inspection (free). We follow the trails to find where they enter and, where we can, the nest itself. We identify the species, because pharaoh ants and pavement ants are not baited the same way.
2. Targeted baiting. We place bait the workers will actually carry, matched to whether the colony wants sugar or protein at that point in the season. Health Canada's Pest Management Regulatory Agency registers these products and evaluates their risk to children and pets before approval, and we apply them to the label.
3. Perimeter and entry treatment where it fits. For pavement ants coming in from outside, we treat the exterior nest and entry points so the source is cut off, not just the indoor trail.
4. Follow-up. We come back to confirm the trails are gone and the colony has collapsed, and re-bait if a satellite nest is still active.

Do you need a pro, or can you do it yourself?

One short pavement-ant trail off a patio, caught early, is often something you can handle: wipe the line to break the scent, seal up the crumbs, and set a sugar bait station where you saw them. Give it a week. Bring in a pro when the trails keep coming back, when they show up in more than one room, when they are the tiny pale pharaoh ants, or when spray has already been tried and lost. Each of those means an established colony you will not out-bait from a hardware-store shelf. Our honest do-I-need-an-exterminator guide walks the line.

Keeping ants out through the season

Preventing ants in Scarborough comes down mostly to moisture and food. Fix the drip under the sink and the leaky hose bib, since odorous house ants track water straight to it. Keep counters wiped and store sugar, honey, and pet food sealed. Caulk the obvious entry cracks along the foundation and around door frames. Pull mulch and firewood back off the foundation, because that is where pavement and other outdoor ants nest before they work a way inside, and it is worth a look on the big treed lots out toward Highland Creek and Guildwood. None of this kills a colony already in the walls, but it decides whether a new one moves in after we clear the last.

Common questions

Reviewed August 2026.

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