How to Get Rid of Black Ants | Stop Them at the Source

Kill black ants by placing bait on their trail so workers carry poison back to the nest and destroy the colony.

Dealing with black ants in your home usually means one thing: a colony is nesting nearby, and workers are foraging for food and water. The fastest way to stop the problem is to stop killing the ants you see and start feeding the ones you don’t. Ant baits let foraging workers carry poison back to the nest, which eliminates the entire colony instead of just the few dozen ants marching across your counter.

Why Sprays Fail and Baits Work

Contact sprays kill the ants they touch, but that only removes the scouts and foragers. The colony itself stays hidden in a wall void, under a slab, or in the yard, and new workers keep coming. Baits work differently: workers eat the slow-acting poison and carry it back to the nest, where it spreads through the colony and kills the queen. That is why the most effective black ant control always starts with baiting.

TERRO, a leading ant control brand, states that ant bait is the most reliable way to eliminate little black ants both indoors and outdoors. Their guidance is clear: place bait directly on active trails, leave it undisturbed while ants are feeding, and remove competing food sources so the workers choose the bait.

How to Get Rid of Black Ants: Step by Step

Follow the trail first. Ants leave pheromone paths that lead from the nest to their food source. Trace the line of ants to find where they enter your home and where they are traveling, then use that same trail to place your bait.

1. Clean the area. Wipe up crumbs, spills, and sticky residue. Store food in sealed containers and keep garbage covered. Remove pet food between feedings so ants have no other food source.
2. Fix moisture problems. Repair leaks and reduce standing water, since ants are attracted to damp areas as much as food.
3. Place bait on active trails. Set commercial liquid bait stations on countertops, in corners, and near entry points. For outdoor control, use perimeter baits around the house foundation.
4. Leave the bait undisturbed. Resist the urge to spray or wipe the area while ants are feeding. Spraying trails too early can reduce bait effectiveness by killing workers before they carry poison back to the nest.
5. Wait days to weeks. Colony collapse takes time. One pest-control source notes that results may take days to weeks depending on the colony size.
6. Seal entry points after activity drops. Once ant activity has stopped, caulk cracks and gaps around windows, doors, pipes, baseboards, and exterior walls. Sealing too early can trap ants inside your walls and cut off their access to bait.

DIY Bait Recipes and Product Options

If you prefer a homemade approach, a boric acid and sugar-water bait is the most commonly recommended recipe. Mix 1 cup of warm water, 8 teaspoons of sugar, and 1/2 teaspoon of borax, then soak a cotton ball in the solution and place it where ants are active. Keep boric acid baits out of reach of children and pets.

For quick knockdown of visible ants, a contact spray works on nests, cracks, crevices, and baseboards, and TERRO Ant Killer Spray covers those spots. But direct-contact sprays are not a standalone solution for whole-colony control. If you see large black ants or evidence of wood damage, one pest-control source recommends calling a professional exterminator, since those signs can point to carpenter ants or a bigger infestation.

When you are ready to buy, our tested roundup of the best pest control for black ants covers which products actually work.

Common Mistakes That Keep Ants Coming Back

The biggest error is spraying every visible ant immediately instead of letting workers carry bait back to the nest. Another is leaving food exposed, pet food unsealed, or garbage open, which gives ants a reason to keep foraging. And sealing cracks before the colony is controlled can trap ants inside walls and reduce bait access, so wait until activity stops before you caulk.