Every summer and into early fall, ant activity peaks in and around Montreal homes — and once a colony finds a reliable food source inside, it can be tough to shake without professional help.
Why ants show up in Montreal kitchens
Ants are drawn indoors by three things: food, moisture, and shelter. Montreal’s older housing stock — with its shared walls, aging foundations, and mix of triplexes and single homes — gives ants plenty of small gaps to exploit, from cracks in foundations to gaps around windows and pipes. Once a scout ant finds crumbs, spilled juice, or pet food, it lays a scent trail back to the colony, and within days you can have a steady line of ants moving through your kitchen or bathroom.
Signs you have an ant problem (not just a few strays)
- A visible trail of ants, usually along baseboards, countertops, or window sills, especially near a food or water source.
- Small piles of dirt or wood shavings near baseboards or window frames, which can indicate a nest nearby.
- Ants reappearing in the same spot day after day, even after cleaning — a sign of an established trail, not a one-off.
Why DIY ant treatments often fall short
Store-bought sprays kill the ants you can see, but they don’t reach the nest — and if the colony has multiple satellite nests (common with certain species in Quebec), spraying can actually scatter the colony and make the problem harder to solve. Bait-based approaches, when used correctly, work better because worker ants carry the bait back to the queen, but shelf products are often not formulated to fully collapse a colony.
What effective ant control looks like
Optima Extermination treats ant infestations at the source with targeted bait and barrier treatments designed to eliminate the colony, not just the ants you can see. Every inspection is free when treatment is required, and we back every job with unlimited follow-up service calls at no extra charge if ants return before the problem is fully resolved.
Preventing ants from coming back
- Seal cracks around windows, doors, and foundation gaps.
- Store food (including pet food) in sealed containers.
- Wipe up spills and crumbs promptly, especially sugary or greasy residue.
- Trim vegetation and mulch away from the foundation, which ants often use as a highway indoors.
If ants keep coming back no matter what you try, it’s worth having a professional identify the entry points and nest location rather than fighting the trail all summer. Optima Extermination offers same-day inspections across Greater Montreal, with treatment plans that get to the source. Book a free inspection or call (514) 458-0805.