Understanding Ant Attraction: What Attracts Ants Besides Food?

Written by Jacob Lander, owner and ODA-licensed applicator · Updated October 2026

What attracts ants into your house? Food, water and shelter. Ants come in for sweets, grease, crumbs and pet food, but also for leaky pipes and damp spots, and to get away from heavy rain or hot, dry weather. In Oregon, the usual kitchen invaders are odorous house ants and pavement ants. Once one ant finds something, its scent trail brings the rest.

Most people figure ants showed up because the kitchen is dirty. Often it’s the weather. A heavy rain floods their nests, or a hot, dry week sends them looking for water. Even a spotless kitchen has a dripping faucet and a dog bowl.

This guide covers what draws ants inside besides food, why they show up all at once, and what actually makes them leave.

What attracts ants besides food?

• Water. Leaky faucets, sprinkler heads, damp crawl spaces and sweating pipes. OSU Extension lists fixing moisture problems as a key step in keeping ants out.
• Shelter and warmth. Odorous house ants nest in wall gaps and warm spots around heaters and water pipes. Carpenter ants nest in wood, insulation, crawl spaces and attics.
• Bad weather. Heavy rain floods pavement ant nests underground and pushes them indoors. Very hot or cold weather does it too.
• Aphids on your plants. Aphids leave a sweet, sticky honeydew, and ants guard them to get it. Ants on a houseplant usually mean aphids.
• Plants touching the house. Branches and shrubs are bridges onto the roof and walls. Bark mulch piled against the siding is a doorway.
• Wet or rotting wood. Moisture ants live in decaying wood, and carpenter ants often start their nests there.

What food attracts ants?

It depends on the ant.

• Odorous house ants go mostly for sweets indoors, but they’ll also take spills, meat, fish, starches and dairy.
• Pavement ants eat almost anything and favor sugar.
• Carpenter ants eat protein, like dead insects, and sweets, especially aphid honeydew. They don’t eat wood. They only nest in it.

The usual draws in an Oregon kitchen: crumbs, grease on the counter, pet food, and unrinsed cans in the recycling.

Why do ants show up all of a sudden?

Because something changed outside. A storm floods their nest, a dry spell cuts off water, or the food they were eating outdoors runs out. UC Integrated Pest Management notes that ants may appear suddenly when weather or food sources change.

Spring is the other trigger. Colonies start growing in late winter and early spring. Carpenter ants come inside for water in early spring, before there’s much food outdoors, and you’ll often find them in kitchens and bathrooms.

Ants on the march in your kitchen? We treat homes all over Oregon. Get a free quote.

When are ants worst in Oregon?

Spring, then again in midsummer. Our own records show it. Over the last two years, March, April and May held 39% of our ant jobs across Oregon, and July was the single busiest month.

Odorous house ants are active outdoors from about April through October. A colony that moves inside stays active all year.

Why does spraying ants make it worse?

Store-bought sprays repel ants, and the PNW Insect Management Handbook warns they can scatter ants all through a house. Odorous house ants have another trick: disturb the colony and it can split into new colonies. Spraying inside also does nothing about the ants still coming in.

Wiping the trail with soapy water helps, because it breaks the scent trail. But ants rebuild it if the food or water is still there.

How do I keep ants out of my house?

• Clean up what they’re after. Crumbs, grease, pet food and spills. Rinse cans before they go in the recycling.
• Fix leaks under sinks, around toilets and at outdoor faucets and sprinklers.
• Wipe trails with soapy water.
• Give the house a gap. Trim plants at least a foot back from walls and the roofline, and pull bark mulch away from the siding.
• Seal entry points around window and door frames, and where pipes and wires come in.
• Use baits, not sprays. Ants carry bait back and share it with the colony. Baits can take a few weeks, so leave them out even when you don’t see ants.

Most ant control is keeping them out. An OSU Extension guide puts it at about 90%: sealing, cleanup and yard work, with treatment doing the rest.

When should I call a pro for ants?

• You think they’re carpenter ants. Watch for sawdust piles, big winged ants inside in late winter or spring, or a faint rustling in the walls. Both OSU and the PNW Handbook say carpenter ants are best left to professionals.
• They keep coming back after a few weeks of baiting.
• You see them all winter. That usually means a colony is living inside.

How Bug Zapper handles ants

We identify the ant first. The right treatment for one kind of ant can make another worse, so we don’t guess. Then we find where they’re getting in and where they’re nesting, and treat both.

On a plan, if ants come back between visits, so do we, at no extra cost. That’s our 1-year Pest-Free Promise. See how our ant control works, or our Portland ant control if you’re in the metro.

Not sure which ant you have? See our guide to the kinds of ants in Oregon.

Ants on the counter? Ants in the bathroom? We should talk. Call 541-636-0146 or get a free quote.

Sources

• Oregon State University Extension: Solve Pest Problems: Ants
• Oregon State University Extension, Ask Extension: How to control household ants
• OSU/PNW Extension: Integrated Pest Management for Ants in Schools (PNW 761)
• Pacific Northwest Insect Management Handbook: Nuisance and household pests: Ant and Wood-infesting pests: Ant
• UC Statewide Integrated Pest Management Program: Ants
• Bug Zapper service records, October 2024–September 2026 (ant jobs, all of Oregon)