The fastest way to get rid of ants yourself is to set out bait stations that worker ants carry back to the colony, killing the queen and collapsing the nest over one to eight weeks. Spraying or squishing the ants you see only removes a tiny fraction of the colony, which can number in the tens or hundreds of thousands. A successful DIY approach combines three things: identifying what type of ant you’re dealing with, using the right bait, and sealing off entry points so new colonies don’t move in.
Figure Out Which Ants You Have
Not all ants respond to the same treatment, and some species signal a more serious problem than others. The three types you’re most likely to find indoors are odorous house ants, pavement ants, and carpenter ants.
Odorous house ants are the most common kitchen invader. They’re tiny (about 1/8 inch), dark brown to shiny black, and give off a strong rotten-coconut smell when you crush them. They nest in shallow mounds in soil, under rocks, or inside wall gaps near warm spots like water pipes and heaters. They’re after sweets and sugary spills.
Pavement ants are slightly larger (3/16 inch), dark brown to black, and typically nest under patios, sidewalks, rocks, and along foundations. They eat both sweets and greasy or protein-rich foods, so you’ll sometimes find them around pet food bowls.
Carpenter ants are the ones to take seriously. At 1/4 to 5/8 inch long, they’re noticeably bigger, black or reddish-black, and they tunnel into wood to build nests. Look for small piles of fine wood shavings near baseboards, window frames, or in the garage. They don’t eat the wood like termites do, but they can cause real structural damage over time. If you see winged carpenter ants indoors, a nest is likely established inside your walls, and DIY methods may not be enough.
Why Bait Works Better Than Spray
When you spray a line of ants with a household insecticide, you kill those specific workers and nothing else. The queen stays safe deep in the nest, keeps laying eggs, and sends out new foragers within days. Worse, some ant species respond to a threat by “budding,” where part of the colony splits off to form a new nest nearby. So spraying can actually multiply your problem.
Bait takes advantage of how ant colonies function. Foragers find the bait, eat some, and carry the rest back to the nest. They share it with other workers, larvae, and the queen through mouth-to-mouth feeding. A slow-acting poison like borax gives them enough time to distribute the bait throughout the colony before it takes effect. Once the queen dies, the colony collapses.
How to Make a Borax Sugar Bait
You can buy commercial bait stations, but a simple homemade version works well for sugar-feeding ants like odorous house ants. The recipe from the University of Hawaiʻi’s agriculture program is straightforward:
- 1 teaspoon boric acid powder (sold as roach killer or in the laundry aisle)
- 3 tablespoons white sugar
- 1¾ cups warm distilled or bottled water (tap water can reduce effectiveness)
Stir until everything dissolves completely. Soak cotton balls in the solution and place them on small squares of wax paper or in shallow lids along the ant trails you’ve spotted. You can also place them near entry points like windowsills, door thresholds, and where pipes enter the wall.
The ratio matters. Too much borax kills ants before they make it back to the nest. Too little won’t do enough damage to the colony. The low concentration in this recipe (roughly 1% boric acid) is the sweet spot for slow colony elimination.
If your ants ignore the sugar bait, they may be in a protein-feeding phase. Ant food preferences shift throughout the year. Try mixing a small amount of borax into peanut butter or a dab of cooking grease instead. Setting out both sweet and protein baits at the same time gives ants a choice and improves your odds.
What to Expect and When
The timeline surprises most people because it starts by looking worse. In the first one to three days, you’ll see more ants around the bait, not fewer. That’s a good sign: workers are recruiting nestmates to the food source. By days three to five, trail activity starts dropping noticeably. Small colonies with a single queen are typically gone within one to two weeks. Larger or multi-queen colonies can take three to eight weeks of steady baiting. Keep refreshing the bait every few days so it doesn’t dry out or get depleted.
Diatomaceous Earth for Entry Points
Food-grade diatomaceous earth (DE) is a fine powder made from fossilized algae. Under a microscope, the particles have razor-sharp edges that scratch through an ant’s waxy outer shell, causing it to lose moisture and dry out. It’s a mechanical kill, not a chemical one, which means ants can’t develop resistance to it.
Apply a light, thin dusting along cracks, baseboards, behind appliances, and around any gap where ants are entering. Outdoors, target the foundation line and any visible trails leading toward the house. A common mistake is piling it on too thick. Ants will walk around a heavy mound of powder, but they’ll walk through a barely-visible dusting. DE loses effectiveness when wet, so reapply after rain or mopping.
DE works best as a barrier and secondary kill method alongside baiting. On its own, it only gets the ants that walk through it and won’t reach the queen.
Vinegar and Peppermint Oil as Trail Disruptors
Ants navigate using pheromone trails, invisible chemical paths that guide nestmates between the colony and a food source. Wiping down surfaces with a 50/50 vinegar-water solution disrupts those trails temporarily. Research at Texas A&M found that vinegar disorients ants by masking their pheromones, but the effect fades once the vinegar evaporates. It’s a decent short-term fix while you wait for bait to work, but it won’t solve the problem on its own.
Peppermint oil is more effective as a deterrent. The same research found that its strong scent completely blocked pheromone signals and caused ants to avoid treated areas entirely. Mix 10 to 15 drops of peppermint essential oil into a cup of water, put it in a spray bottle, and apply it around doorframes, windowsills, and known entry points. Reapply every few days as the scent fades.
Safety Around Pets and Children
Borax is low in toxicity for humans at the small amounts used in ant bait, but it can cause vomiting and diarrhea if a child or pet eats a significant quantity. Place bait stations in spots pets and toddlers can’t reach: behind the refrigerator, inside cabinets, under the stove, or in sealed bait containers with small entry holes.
Essential oils require more caution than most people realize. Concentrated essential oils are genuinely dangerous for pets. Dogs and cats that walk through spilled oil or ingest it can develop vomiting, diarrhea, unsteadiness, and in severe cases, dangerously low body temperature. As few as seven or eight drops of concentrated tea tree oil can cause problems. Keep all essential oil bottles stored out of reach, and avoid applying oils directly to surfaces where pets walk or groom themselves. If you have birds, skip essential oil diffusers entirely, as their respiratory systems are extremely sensitive.
Food-grade diatomaceous earth is generally safe around pets and children but can irritate lungs if inhaled in large amounts. Apply it in low-traffic areas and avoid creating dust clouds during application.
Cut Off Food and Entry Points
Bait works to kill the existing colony, but prevention keeps the next one from moving in. A few changes make your home far less attractive to scouts:
- Clean up immediately after meals. Wipe counters, sweep floors, and don’t leave dirty dishes in the sink overnight.
- Store food in sealed containers. Sugar, honey, cereal, and pet food are the biggest attractors.
- Pick up pet food bowls after feeding time rather than leaving them out all day.
- Seal entry points with caulk. Check where pipes and wires enter your walls, gaps around windows and doors, and cracks in the foundation.
- Fix moisture problems. Ants need water. Leaky faucets, dripping pipes under the sink, and poor drainage near the foundation all draw colonies closer.
These steps alone won’t eliminate an established colony, but without them, even a successful baiting campaign is just a temporary fix. A clean, sealed-up home gives scout ants no reason to recruit their nestmates inside.
When DIY Methods Won’t Be Enough
Most sugar ant and pavement ant problems respond well to consistent baiting over a few weeks. But there are situations where calling a professional is the faster and smarter move. Carpenter ants are the big one. Their nests inside wall voids and structural wood are difficult to reach with surface-level baits, and the damage they cause compounds over time. If you’re finding wood shavings, seeing large ants (especially winged ones) indoors, or hearing faint rustling inside walls, a pest control inspection is worthwhile. Winged ants indoors in particular suggest an established nest that’s producing new queens, and these can easily be confused with termites, which is another reason to get a professional eye on them.
Multi-colony infestations also tend to outlast DIY efforts. If you’ve been baiting consistently for more than eight weeks without significant improvement, or if ants keep reappearing from different locations around the house, the problem may involve multiple nests or a colony with access points you can’t find on your own.