How to Get Rid of Ants: What Actually Works

If you want to know how to get rid of ants for good, the single most important thing to understand is this: bait beats spray. Spraying the trail kills the ants you can see but leaves the nest, and the queen, fully intact, so the line of ants is back within days. Slow-acting bait works the opposite way, turning the ants into couriers that carry poison home to the colony. Done right, baiting plus a little cleanup and sealing is how you actually eliminate an ant problem rather than just interrupting it.

Why does spraying ants never seem to work?

Reaching for a can of spray is the natural reflex, and it is exactly why so many people fight the same ants month after month. A contact spray kills the workers it hits. But in most common house-invading species, the workers you see on the counter are a tiny fraction of the colony, which lives hidden in a wall void, under a slab, in the yard, or beneath the floor. The queen, the brood, and the vast majority of workers never touch the spray. Within a few days the colony simply sends out new foragers, and the trail returns.

There is a second, less obvious problem. Many over-the-counter sprays are repellent — ants detect the residue and avoid it. That sounds helpful, but it backfires. Repellent chemicals can scatter the colony into multiple smaller nests (a behavior sometimes called “budding”), turning one ant problem into several. University of California IPM guidance is blunt on this point: ant baits are a key tool for managing ants, and in most indoor situations they are the only type of insecticide recommended. Spraying can actively interfere with baiting, because foragers avoid the treated zone and never pick up the bait you placed for them.

So the mental model to adopt is not “kill the ants in front of me” but “kill the colony I cannot see.” That reframing is the whole game.

What kills ants permanently — how bait actually works

Ant baits pair a food the ants want (sugar, protein, or oil, depending on the species and season) with a slow-acting insecticide. The slowness is the entire point, and it is counterintuitive: a bait that killed foragers instantly would be a failure. Because the toxicant acts slowly, a worker has time to carry the bait back to the nest and share it, through a mouth-to-mouth food exchange called trophallaxis, with other workers, with the brood, and ultimately with the queen. Colonies survive almost any assault as long as the queen keeps laying eggs; once the queen is poisoned and dies, the colony collapses.

This is why patience matters. You may actually see more ants in the first day or two after setting bait, because you have handed them a food source and they recruit nestmates to it. That surge is a sign the bait is working, not failing. Resist the urge to wipe them out with spray at that moment — you would be killing your own couriers.

Baits come in three main forms:

• Liquid and gel baits — often the most attractive to sweet-feeding ants like the odorous house ant. The ants drink and carry it in their crop. Liquids tend to work fast on sugar-loving species and are easy to place in bait stations.
• Granular baits — small pellets usually combining a protein or oil carrier with the toxicant; often used outdoors or for protein-seeking species. They can dry out and lose appeal, so freshness matters.
• Solid/paste baits in stations — enclosed stations keep the bait fresh, contained, and away from children and pets while still letting ants in.

Common slow-acting active ingredients in consumer baits include borax and boric acid, fipronil, hydramethylnon, indoxacarb, and abamectin. Different products use different ones; the concentration is deliberately low so the ants survive long enough to spread it. If one bait is ignored, the issue is usually the food type (sweet vs. protein) rather than the poison, so switching bait formulations is often the fix.

How do I figure out which ant I actually have?

Identification matters more than beginners expect, because the correct bait and the seriousness of the problem both depend on the species. Most of the ants invading U.S. homes fall into a handful of groups. A cheap jeweler’s loupe or your phone’s macro mode, plus a clear look at the ant’s waist (the narrow segment between thorax and abdomen) and its size, gets you most of the way there.

Odorous house ants

The classic “tiny ants in house” culprit. Tapinoma sessile workers run about 2.5 to 3.5 mm long and are uniformly brown to black. The giveaway is the smell: crush one and it gives off a distinctive rotten-coconut or “blue cheese” odor, which is why they are also called stink ants or coconut ants. They do not sting and are ineffective biters — they are a nuisance, not a danger. They love sweets, which is why they so often show up as ants in the kitchen around spills, fruit, and sugary residue. Under a lens, the single node on the waist is low and flattened, often hidden by the abdomen.

Argentine ants

To the naked eye, Argentine ants look much like odorous house ants — small and brownish. The difference is in the waist: the Argentine ant has a single, pointed node, while the odorous house ant’s node is flat. Argentine ants form enormous, interconnected “supercolonies” with many queens, which makes them especially stubborn and especially well suited to baiting (spraying just splinters them further). They tend to displace other species, so in areas where Argentine ants are established, odorous house ants are less common.

Pavement ants

Medium-small, roughly 1/10 to 1/4 inch, dark brown to blackish, and relatively slow-moving. As the name says, they nest under sidewalks, driveways, slabs, and foundations, pushing out little piles of excavated soil at pavement cracks. They come indoors foraging for both greasy and sweet foods. They can sting but rarely bother people.

Carpenter ants — the one you must not ignore

Carpenter ants are different, and getting the ID wrong here can be expensive. They are large — often 1/4 to 1/2 inch — and usually black, sometimes reddish-black. Critically, they do not eat wood the way termites do. Instead they excavate galleries in wood to expand their nest, leaving behind a smooth, almost sandpapered surface and kicking out piles of sawdust-like “frass” mixed with insect fragments. Most importantly, carpenter ants nest in moisture-damaged, soft, or rotten wood. Extension specialists stress that they rarely destroy sound lumber and, in the short term, rarely cause major structural failure on their own — but their presence is a red flag that there is a water leak or chronic moisture problem somewhere in the structure. Indoor carpenter ant activity is frequently a satellite nest connected to a larger parent colony outdoors in a tree, stump, or woodpile.

Do not confuse carpenter ants with termites. Carpenter ants have bent (elbowed) antennae, a clearly pinched, narrow waist, and, when winged, two pairs of unequal-length wings. Termites have straight bead-like antennae, a thick waist with no pinch, and equal-length wings. If you see large black ants indoors in winter, or winged ants emerging from a wall, treat it as a possible carpenter ant or termite issue and get it inspected.

A note on getting a confident ID

If you are unsure, extension offices across the country will identify specimens for you. Collect a few ants with clear tape or drop them in a small vial, and send or bring the dead specimens to your local Cooperative Extension office. A correct species ID tells you whether you are dealing with a simple sweet-feeding nuisance or a structural warning sign.

How do I get rid of ants in the kitchen?

The kitchen is ground zero for most infestations because it offers the three things ants want: sugar, grease, and water. What attracts ants is rarely mysterious — it is a sticky ring under the honey jar, crumbs behind the toaster, an unrinsed recycling bin, pet food left out overnight, or a dripping faucet. Before you place a single bait, think like a forager and remove the competition, because bait only works if it is the most appealing thing in the room.

Here is the practical sequence for ants in the kitchen:

1. Follow the trail to the entry point but do not destroy it yet — the trail tells you where to place bait and where ants are getting in.
2. Clean up competing food. Wipe counters with soapy water or a vinegar-water solution, which also erases the invisible pheromone trail the ants follow. Store sugar, syrup, honey, and pet food in sealed containers, and wash the outside of sticky jars.
3. Place bait near the trail, not on it. Set bait stations or a dab of gel a few inches off the active trail, between the ants and their entry point. Place several small bait points rather than one.
4. Leave it alone. Do not spray, do not wipe up the ants swarming the bait, and do not move the station. Give it one to two weeks.
5. Seal the entry only after activity drops, so you are not trapping foragers inside before they have delivered the bait.

If ants swarm one bait and ignore another, you have learned something useful about what they want right now — switch between a sugar-based and a protein/grease-based bait accordingly. Colonies shift their preference seasonally.

How to get rid of ants naturally (and what that can and can’t do)

If you want to know how to get rid of ants naturally, it helps to separate two goals: disrupting trails and eliminating the colony. Natural methods are genuinely good at the first and mostly weak at the second.

For breaking up trails and deterring foragers:

• Soapy water or a vinegar-and-water spray wiped along counters and baseboards kills ants on contact and, more usefully, dissolves the scent trail so stragglers lose their way.
• Diatomaceous earth (food-grade) dusted in dry cracks and along foundations abrades the ants’ exoskeleton; it only works while dry.
• Caulk, petroleum jelly, or tape over entry cracks physically blocks the path.

The one “natural” approach that can actually kill a colony is a homemade borax (or boric acid) sugar bait — because that is still a slow-acting bait that gets carried home, just a DIY one. A common starting mix is roughly 1 part borax to about 3 parts sugar dissolved in warm water to a syrup, soaked onto cotton balls in a shallow lid; some recipes go as lean as 1 part borax to 8 or 9 parts sugar. Ratios vary widely across sources, so treat exact numbers as approximate. The guiding principle from extension specialists is important: use only a small amount of borax, because too much kills foragers too fast or repels them, and then it never reaches the queen. Less toxicant, more patience.

Safety is non-negotiable here. Borax and boric acid are genuinely poisonous if ingested — boric acid is generally considered the more toxic of the two — and homemade syrup baits look and smell like food. Keep any borax bait completely out of reach of children and pets, ideally enclosed in a taped-over container, and skip the DIY route entirely in homes with crawling infants or pets that forage. Commercial enclosed bait stations exist precisely to solve this exposure problem.

What natural methods will not do: essential oils, coffee grounds, cinnamon, chalk lines, and cucumber peels may annoy ants briefly but do nothing to the nest. They are trail disruptors at best.

What works vs. ant myths

A lot of popular advice is actively counterproductive. Sorting it out:

• Myth: “Spray the whole trail to kill them.” Reality: contact spray kills visible workers only and can scatter the colony. It is the single most common reason an ant infestation keeps coming back.
• Myth: “If the bait doesn’t kill them fast, it’s a dud.” Reality: slow is by design. Fast death stops the poison from reaching the queen.
• Myth: “A seeing a few more ants after baiting means it failed.” Reality: the short-term increase is recruitment to the bait — a good sign.
• Myth: “One bait station will do it.” Reality: place several, close to trails, and keep them stocked for weeks.
• Myth: “Cinnamon / coffee grounds / essential oils get rid of ants.” Reality: these may briefly disrupt a trail but do not touch the colony.
• Myth: “Caulking first will solve it.” Reality: sealing a busy entry too early can trap foragers inside before they deliver bait; clean and bait first, seal last.
• Fact: removing food and water is half the battle. Bait competes with whatever else is available, so a clean kitchen makes bait far more effective.
• Fact: the species determines the strategy. Sweet vs. protein bait, nuisance vs. structural — ID first.

The step-by-step plan to get rid of ants permanently

If you want to know how to get rid of ants permanently, understand that “permanent” means colony elimination plus closing off the conditions that invited them. Here is the full plan, in order:

1. Identify the ant. Check size, waist shape, and whether crushed ants smell. Rule out carpenter ants (large, black, wood/moisture-associated) before anything else — if that is what you have, jump to the professional section.
2. Find the trails and entry points. Watch where ants travel and where they disappear into walls, outlets, window frames, and plumbing gaps. Note them; don’t seal yet.
3. Remove food and water. Deep-clean counters, sweep crumbs, seal sugar and pet food in airtight containers, take out food waste, fix leaky faucets and condensation. You are making the bait the best meal in the house.
4. Erase the scent trails. Wipe known trails with soapy or vinegar water so new foragers can’t follow the chemical road map.
5. Place slow-acting bait. Set several bait stations (or gel points) a few inches off active trails, between ants and their entry. Offer both a sweet and a protein/grease bait if you’re unsure of preference.
6. Wait — and don’t spray. Give baits one to several weeks. Expect an initial increase. Keep baits fresh; replace dried-out bait.
7. Treat the nest if you can find it. Outdoor nests (under stones, mulch, pavement) can be baited directly; granular bait around the foundation can help intercept foragers.
8. Seal entry points. Once activity has dropped, caulk cracks around windows, doors, pipes, and wires; repair torn screens. Use petroleum jelly or tape as a temporary stopgap.
9. Harden the perimeter. Keep plants, grass, and organic mulch at least a foot back from the foundation, trim branches touching the house, and move woodpiles away from walls.
10. Monitor and maintain. Re-bait at the first sign of return. Persistent sanitation and sealing are what make elimination stick.

Which method should I use? A side-by-side comparison

Why do ants keep coming back?

If ants return again and again, it is almost always one of four reasons. First, you sprayed instead of baited, so the colony was never eliminated. Second, there is still an easy food or water source — a leaky pipe, pet food, or a sticky pantry — that out-competes the bait. Third, open entry points let fresh foragers from an outdoor colony keep streaming in. Fourth, the species is a multi-queen supercolony former (like the Argentine ant), which simply takes longer and more consistent baiting to grind down. Fixing recurrence means being honest about which of these is still true and closing it.

A quick prevention checklist

Once the colony is gone, these habits keep a new ant infestation from taking hold:

• Wipe counters and sweep floors daily; clean spills immediately.
• Store sugar, honey, syrup, cereal, and pet food in sealed containers; wash sticky jar exteriors.
• Don’t leave pet food or dirty dishes out overnight.
• Take out food waste often and rinse recycling and trash bins.
• Fix leaky faucets, pipes, and condensation — many ants come inside hunting water.
• Caulk cracks and gaps around windows, doors, pipes, and electrical/plumbing entries.
• Repair torn window and door screens.
• Keep plants, grass, and mulch at least a foot from the foundation.
• Trim tree and shrub branches that touch the house (ant highways).
• Move firewood, lumber, and debris away from exterior walls.
• Address damp or rotting wood promptly — it is what carpenter ants look for.

When should I call a professional?

Most sweet-feeding nuisance ants in the house can be handled with patient baiting and cleanup. Call a licensed professional when:

• You have (or suspect) carpenter ants. Because they signal moisture damage and can enlarge nests in structural wood, the right move is an inspection that finds both the nest and the underlying leak. This is a building problem, not just a bug problem.
• You see winged ants indoors or can’t tell ants from termites — termite swarmers demand urgent, separate treatment.
• The infestation is large, spreading, or multi-room, suggesting a big or multi-queen colony (such as Argentine ants) that home baits are only slowly denting.
• Baiting and sanitation for several weeks haven’t worked, which usually means the species, nest location, or bait type needs expert diagnosis.
• You can’t identify the species and want a confident ID plus a targeted plan.
• Anyone in the home is medically vulnerable (stinging species, allergies) or you’re uncomfortable handling insecticides around children or pets.

A good pro does exactly what this guide describes — just with correct species ID, access to professional baits, and the experience to locate the nest. The underlying logic never changes: find what attracts them, cut it off, bait the colony to the queen, seal the house, and be patient. That is how you get rid of ants and keep them gone.