Ants keep coming back after spraying because a colony's worker ants are replaceable, but the queen is not. A single queen can produce hundreds of eggs a day, and a colony can hold anywhere from a few hundred to several hundred thousand ants. Killing visible workers does nothing to stop her, the only permanent fix is eliminating the queen herself.
Why Killing the Ants You See Never Works
Many kitchens reach the point where someone has already gone through half a can of Raid, a bottle of vinegar and a shaker of cinnamon. They wipe the counter, kill five ants, and twenty minutes later there are ten more. That's not five ants, that's a colony sending replacements.
Worker ants are sterile. They can't reproduce. Worker ants can't have babies, which means when a queen dies, the colony usually dies a few months later. Until that happens, the workers you kill on the counter are simply replaced by the next batch she's already laid.
How the Colony Actually Communicates
Ants don't wander randomly. Ants rely heavily on pheromone signals to communicate within their colony, and when a worker ant finds a food source, it releases pheromones to create a trail that other ants can follow. Every ant behind that scout follows the exact same invisible path.
This is why wiping down a counter accomplishes almost nothing. The chemical trail is still active on your baseboard, your window track, or your foundation crack, and more workers are already on the way. Some species even physically clear debris to reinforce a strong trail, which tells you how committed the colony is to a good food source once it's found one.
Colony size varies a lot depending on species and maturity. The colony size can range from a few hundred individual ants to millions, depending on the species. Either way, the workers you're spraying represent a tiny fraction of the total population.
Why Ants Suddenly Show Up After Spring Rain
Ant activity in Ontario homes spikes hard in spring, and it's not a coincidence. Colonies overwinter underground or inside wall voids where it's insulated and dry. Once the ground warms and spring rain saturates the soil, moisture pushes them upward, through foundation cracks, weep holes, and gaps around windows and doors you'd never notice otherwise.
That's also when new reproductive ants tend to disperse to start new colonies, which is part of why an ant problem can seem to multiply overnight even in a home that had zero activity the year before.
Key tip: If you're finding ants at the same spot on your counter every single day at roughly the same time, that's an active pheromone trail, not a random invasion. Don't wipe it and forget it; that trail will get reused within hours.
Related full guides: Pharaoh Ants in Ontario: Identify and Get Rid of Them
How AstraHive Pest Control gets rid of ants
The goal with ants is the queen, not the workers on your counter. We combine bait that workers carry back to the queen with a weatherproof barrier around the outside of the house, and treat the inside when ants are active there.
How an AstraHive ants treatment works
Inspect and follow the trails
We follow the ant trails to find where they come in and where the nest is likely to be, so the bait and the barrier go in the right places.
Granular bait in the yard
We spread professional granular bait across the front and back yard around the nesting areas and colonies, and along the perimeter of the building. Workers carry it back to the queen, the queen dies and the colony collapses.
Liquid bait in bait stations
We set Scorpio liquid bait in bait stations around the exterior perimeter, near the nest and wherever ants are active. Ants feed and carry it back to the nest, and the stations keep working after we leave.
Weatherproof exterior perimeter spray
We spray a barrier around the foundation, windows, doors and entry points, applied according to the product label. It stays active for about 90 days, so ants coming from outside cross the treated zone before they get in.
Interior treatment if needed
If ants are already active inside, we treat the interior as well as the exterior, never the inside alone: a residual spray along the interior perimeter, baseboards and known travel routes, and gel bait along the trails, out of reach of children and pets.
Document everything
Where we found ants, what we found and every product used goes in the service report, along with what to change around the property, such as moisture and wood-to-soil contact.
Back it with a 90-day warranty
If ants come back within 90 days, we re-treat at no charge.
We also dust into the accessible wall voids and cracks where ants travel and nest, with a professional dust that keeps working in places a spray cannot reach. That, together with the bait and the outside barrier, is how we keep ants from coming back, rather than trying to seal every gap, because ants find another way in.
Our products are Health Canada approved and safe for kids and pets, and we apply every product according to its label. AstraHive is licensed by the Ontario Ministry of the Environment, Conservation and Parks. Ontario requires a ministry-approved certification course before it issues an exterminator licence, and that training is delivered through the University of Guelph, Ridgetown Campus.
Bait and the outer barrier are applied in different places on purpose: the bait stays on the routes ants forage along so workers can carry it home, and the barrier sits at the building's edge. That is also why we ask you not to spray the ants you see or wipe their trails before we arrive: killing the workers stops the bait reaching the queen.
Where Most Ant Treatments Fall Short
Most companies show up, spray the baseboards inside, and leave. That kills the ants that were already in your kitchen, but the queen is still alive underground or in the wall void, still laying. Two weeks later, the ants are back, because nothing about that visit ever reached the actual colony.
A thorough treatment has to work outside-in: yard, perimeter, entry points, and only then the interior if it's still needed. Skipping the yard and bait stations is the single biggest reason DIY sprays and quick-spray competitors fail long-term.
Species You're Likely Dealing With in Ontario
Not every ant behaves the same way, which affects bait choice and treatment timeline:
- Carpenter ants: nest in moisture-damaged wood, often only one queen per colony, but a mature nest can grow for years before you notice damage.
- Odorous house ants: frequently have multiple queens (polygyne), which makes them harder to fully eliminate with a single treatment round.
- Pavement ants: typically nest under slabs, driveways, and foundations, usually with one queen per colony.
Some species of pest ants have multiple queens in a colony, such as Pharaoh ants, little black ants, Argentine ants, crazy ants, odorous house ants and thief ants. That single fact is why some ant jobs need a second bait cycle, you're not dealing with one target, you're dealing with several.
Frequently Asked Questions
Typical cost: Starting at $350 CAD, with final cost depending on property size and severity of infestation - there is no fixed upper limit. Call 905-925-8427 for an exact free quote.
Why Choose AstraHive
- Licensed & Insured: Certified by the Ontario Ministry of Environment, Conservation and Parks.
- Fast response: Same-day service available, with a callback within 5 minutes.
- 90-Day Warranty: If pests come back within that window, we re-treat at no additional charge.
- Proven track record: 5.0 stars on Google across 200+ reviews.
- Family & pet safe: Health Canada approved products on every job.
Frequently Asked Questions
Why do ants keep coming back after I spray them myself?
Store-bought sprays only kill the workers you can see, not the queen producing new ants deep in the nest or wall void. As long as she's alive, she keeps laying eggs and replacing every worker you kill, so the trail reactivates within hours or days.
How long does professional ant treatment take to work?
Granular bait and bait stations need time to reach the queen because worker ants carry the product back to the nest rather than dying instantly on contact. Most homeowners see a sharp drop in activity within the first 1-2 weeks, with the exterior perimeter spray providing an immediate barrier that stays active for 90 days.
Why do I suddenly see more ants after it rains in spring?
Ant colonies overwinter underground or inside wall voids to stay insulated through winter. When spring rain saturates the soil, moisture pushes them upward through foundation cracks and gaps around windows and doors in search of drier ground, which is often your home.
How much does ant treatment cost in Ontario?
Every job includes a 90-day warranty covering free re-treatment if activity returns.
Are the products used for ant treatment safe for kids and pets?
Yes, all products AstraHive uses are Health Canada approved and formulated to be safe for households with children and pets once applied according to label directions.
Sources
- Health Canada: Ants (Pest control tips) — Bait systems must work slowly enough for the whole nest to be fed; place bait stations in the path of foraging ants and keep baits available at least two weeks; do not spray while baiting; scouts find food and ants favour sugary and greasy foods; look for a Pest Control Products number.
- Ontario.ca: Pesticide licences and permits — Ontario's Ministry of the Environment, Conservation and Parks issues exterminator licences after a ministry-approved certification course, delivered through the University of Guelph, Ridgetown Campus.
- Pest World for Kids — Worker ants cannot reproduce, so a colony typically dies out within a few months after the queen dies.
- Western Exterminator — Ant colonies communicate via pheromone trails laid down by workers who find food, and colony sizes can range from a few hundred to millions of ants depending on species.
- Pest Control Technology (Fascinating World of Ants) — Some pest ant species, including odorous house ants, have multiple queens per colony (polygyne), making full elimination more complex.
Areas We Serve
AstraHive Pest Control proudly serves 75+ communities across the following regions:
- Toronto: Toronto, North York, Scarborough, Etobicoke, East York, York, Leslieville, Lakeview
- Durham Region: Oshawa, Whitby, Ajax, Pickering, Clarington, Bowmanville, Courtice, Newcastle, Port Perry, Brooklin, Uxbridge, Scugog, Brock, Seaton
- York Region: Vaughan, Markham, Richmond Hill, Aurora, Newmarket, Thornhill, Woodbridge, Kleinburg, Maple, Stouffville, Unionville, Keswick, Holland Landing, East Gwillimbury, Georgina, King City, King Township, Nobleton, Berczy Village, Cathedraltown, Commerce Valley, Cornell, Wismer, Whitchurch-Stouffville, Sutton, Schomberg
- Peel Region: Mississauga, Brampton, Caledon, Malton, Port Credit, Streetsville, Meadowvale, Cooksville, Bolton, Palgrave
- Extended Service Area: Peterborough, Lindsay, Port Hope, Barrie, Bradford, Innisfil, Collingwood, Wasaga Beach, Orillia, Burlington, Oakville, Milton, Hamilton, Grimsby, St. Catharines, Welland, Niagara Falls
Don't see your city listed? Call us — we likely cover it.
Got a pest problem right now?
Call AstraHive for a free consultation. Licensed & insured, serving the GTA, Durham, York, Peel and Simcoe County.
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