Why Ants Invade Manitoba Homes Every Spring

Every spring, as soil temperatures climb, dormant ant colonies across Manitoba become active again, and scouting ants start fanning out in search of food and moisture. Homes with easy entry points and reliable food sources become prime real estate almost overnight.

Carpenter ants are especially active this time of year, often nesting in moisture-damaged wood around windows, decks, and rooflines before moving into structural framing. Argentine ants, by contrast, form massive interconnected colonies that can overwhelm a kitchen or bathroom in days once a single trail is established.

Small cracks in foundations, gaps around utility lines, and overhanging tree branches that touch the roofline are the most common entry points. Trimming vegetation back from the house and sealing obvious gaps before the spring thaw goes a long way toward keeping colonies from ever finding a way in.

If you're already seeing trails indoors, treating only the ants you can see rarely solves the problem: the colony and queen are almost always somewhere out of sight. A targeted inspection identifies the nest itself, not just the foraging trail leading to it.