Why do ants come inside when the weather warms up?
As the ground thaws, colonies that slowed down for winter restart and send out workers to find food and water. A kitchen with crumbs or a damp spot is easy to find. The timing is a general pattern for cold climates and not a measured date for Euclid.
A long, snowy lake-effect winter pushes ant colonies deep into the soil or into the warmth of a wall. When the first warm days arrive, scouts begin to explore, and once one finds a sweet spill it lays a scent trail that the rest of the colony follows. That is why a house with no ants all winter can have a line of them by the first week of spring.
Rain matters as well. A heavy storm can flood a nest in a lawn edge and send workers looking for dry ground, which sometimes means your basement. Check the seams around basement windows and the places pipes enter the wall.
Are the ants in my kitchen a sign of a dirty house?
No. Ants follow food and water, and a clean kitchen can still have a sticky patch under the toaster or a drip under the sink. They also come in simply because a crack exists. Good housekeeping helps, but it does not by itself keep out ants that live outside.
What helps is removing the easy rewards: wipe up sweet spills, store sugary food and pet food in sealed containers, rinse recycling and take trash out before it overflows. Fix any slow drip, since water pulls ants in as much as food does.
Tidying is only half the answer, because the colony is somewhere else. If ants return within a week of a thorough cleaning, they are being drawn from a nest that needs to be treated.
What is the difference between pavement ants and carpenter ants?
Pavement ants are small, dark brown to black, and nest in soil under pavement and slabs. Carpenter ants are large and nest in damp wood. The first is mostly a nuisance, the second can damage wood, so telling them apart changes the treatment.
Pavement ants are often seen at driveway cracks with small heaps of soil. They come indoors for food but do not tunnel into the house. They are among the ants people most often describe when they say they have ants in the kitchen.
A big ant, shavings under a sill or a rustling inside a wall means you should read the page on carpenter ant control instead. If you are not sure, a photo shown to a technician is a quick way to find out.
Can I get rid of ants with store-bought spray?
A spray kills the ants it touches and can leave the colony untouched. It may also make some species split into new nests. Bait generally does more for a persistent problem, because workers carry it back. If ants keep returning, a technician's inspection is the next step.
Sprays are useful for a quick clean-up of a trail, but they also destroy the scent trail that a bait would use. People often spray, then set a bait, then wonder why the ants ignore it. The order matters: bait first where ants are gathering, and leave the trail alone.
Read the label on anything you use, keep it away from food and children's play areas and do not spray near pet bowls or fish tanks.