How to Get Rid of Ants (and Why Spraying Makes It Worse)

You see a line of ants on your kitchen counter. You grab a can of Raid. You spray. They die. Problem solved, right?

Wrong. In about three days, you'll have two lines of ants instead of one. Maybe in a different room. Here's why that happens and what to do instead.

Why Ant Spray Makes the Problem Worse

Most ant species practice something called budding. When part of a colony is threatened -- say, by a burst of pyrethroid spray -- the surviving ants split off and form a new colony somewhere else. One colony becomes two. Spray again, two becomes four.

The ants you see on your counter are foragers. They represent maybe 10% of the colony. The queen and the brood are safely tucked away in a wall void, under a slab, or in the soil outside your foundation. Killing foragers doesn't touch the colony. It just triggers a defensive response.

Ant spray is the most popular product in the pest control aisle and it's the worst thing you can buy for an ant problem. That's wild if you think about it.

Bait Is the Only Real Answer

The goal isn't to kill the ants you see. It's to kill the queen you don't see.

Bait works because foragers carry it back to the nest and feed it to the queen, the larvae, and the rest of the colony. It takes 3 to 7 days. You'll actually see more ants at first because they're recruiting nestmates to the food source. That means it's working. Don't panic, don't spray, and don't wipe up the trail.

For the small brown or black ants in your kitchen (odorous house ants, Argentine ants, pavement ants), Terro liquid bait stations work great. About $7 for a 6-pack at any hardware store. They're sugar-based, which is what these species are after. Set them right next to the ant trail, not across the room. The closer to the trail, the faster they find it.

For a broader range of species, or if Terro isn't cutting it, step up to Advion Ant Gel ($25 on Amazon). It's the same product professionals use. Apply tiny dots along the trail and near the entry point. A single tube treats a whole house.

One weird thing about ants: their food preferences shift seasonally. In spring, they crave protein. In summer, they want sugar. If a sugar bait isn't working, try a protein-based bait like Advion. If neither works after two weeks, you may be dealing with a species that needs a different approach.

Kitchen Ants: The Quick Fix

Step one: find where they're coming in. Follow the trail backward. It usually leads to a tiny gap around a window frame, a crack where the backsplash meets the counter, or a hole where a pipe goes through the wall.

Step two: wipe the trail with a vinegar-water mix. This destroys the pheromone trail so new foragers can't follow it. Regular soap and water works too.

Step three: place bait right next to the entry point. Terro or Advion.

Step four: once the ants stop coming (give it 5 to 7 days), seal the entry point with caulk. A $4 tube of silicone caulk from Home Depot handles most gaps. For a full entry-point checklist, see our pest-proofing guide.

That's it. Whole process costs under $12 and takes about 10 minutes of actual work plus a week of patience.

Carpenter Ants: A Different Problem Entirely

Carpenter ants are large -- half an inch or bigger, usually black, sometimes reddish-black. If you're seeing big black ants inside your house, especially in spring or at night, pay attention. These aren't just annoying. They can cause real structural damage over time.

Quick clarification: carpenter ants don't eat wood. Termites eat wood. Carpenter ants excavate it to build nests. They chew tunnels and chambers, then push the sawdust out. That sawdust -- it's called frass -- looks like tiny wood shavings mixed with dead insect parts. Finding frass piles is the clearest sign you've got an active nest.

They're attracted to moisture-damaged wood. A leaky bathroom, a roof drip that's been soaking a wall stud, a deck board that stays wet -- that's where the nest usually is. Fix the moisture problem and you've removed what attracted them in the first place.

Finding the nest is the hard part. Carpenter ant nests can be in wall voids, floor joists, window frames, or porch columns. Pros tap along the wood and listen for a hollow rustling sound. They also watch ant activity at night with a flashlight since carpenter ants are most active after dark.

Carpenter ant treatment costs $500 or more because the exterminator needs to locate the nest, drill into the void, and inject dust or foam directly. Bait alone can work but it's slow -- we're talking 3 to 6 weeks to see results. If the nest is in a structural member, you don't want to wait that long.

Fire Ants: The Two-Step Method

If you live anywhere from Texas to the Carolinas, you already know about fire ants. If you don't, count yourself lucky. Their sting feels like someone touched a lit match to your skin, and they attack in groups.

Pouring boiling water on a mound is satisfying but pointless. The queen sits 2 to 3 feet deep. You'll kill some workers and she'll rebuild in a week, often just a few feet away. Same story with gasoline, grits, club soda, and every other home remedy your uncle swears by. None of it works long-term.

What does work is the two-step method, developed by Texas A&M entomologists:

Step one: Broadcast bait (Amdro Fire Ant Bait, about $18 for a bag that covers a quarter acre) across your entire yard. Don't put it on the mounds. Scatter it on the surrounding ground. Foragers pick it up, bring it back to the queen, and it kills the colony from the inside. Do this in the morning or evening when ants are actively foraging. Not during the heat of the day.

Step two: Wait 3 to 5 days, then drench individual mounds that are still active. Orthene Fire Ant Killer ($10 at Lowe's) mixed with a gallon of water, poured slowly over the mound so it saturates down to the queen.

Repeat the broadcast bait twice a year -- spring and fall. Fire ants are never truly gone in the South. The goal is suppression, not eradication. A colony queen can produce 1,500 eggs per day. You're managing a population, not winning a war.

What Does Professional Ant Treatment Cost?

Standard ant treatment (sugar ants, pavement ants, Argentine ants): $150 to $300 for a one-time service. This usually includes exterior perimeter treatment plus interior baiting. Most people don't need a pro for these species unless the problem keeps coming back.

Carpenter ant treatment: $500 to $1,000+. Higher because locating the nest requires inspection time, and treatment involves drilling and injecting voids. If there's structural damage, you'll also need a repair contractor.

Fire ant yard treatment: $150 to $300 per application. Many lawn care companies include fire ant treatment in their annual plans for $400 to $600 per year.

When to DIY and When to Call a Pro

Small trail of sugar ants in the kitchen? DIY. Terro bait, vinegar wipe, caulk the gap. Done.

Ants keep coming back after baiting for two weeks? Call a pro. You might have a larger colony or multiple entry points you're missing.

Big black ants and sawdust piles? Call a pro. Carpenter ant damage gets expensive if you let it go, and homeowners insurance won't cover it. Getting a $500 treatment now beats a $5,000 repair later.

Fire ant mounds across your whole yard? The two-step method works fine as a DIY project. But if you've got more than 20 mounds or they're near a playground where kids are at risk, a professional broadcast treatment is worth the money.