A simple mix of baking soda and powdered sugar is one of the most popular DIY ant killers, and it does work on individual ants. The standard recipe is a 1:1 ratio: equal parts baking soda and powdered sugar, placed along ant trails or near entry points. The sugar draws ants in, and the baking soda kills them after ingestion. But how well this actually works depends on your expectations, your placement strategy, and the size of the colony you’re dealing with.
The Basic Recipe
Mix equal parts baking soda and powdered sugar in a small bowl. Powdered sugar works better than granulated because the fine texture blends evenly with the baking soda, making it harder for ants to pick out the sugar and leave the baking soda behind. Ants are surprisingly good at separating particles of different sizes, so a uniform mixture matters.
You can also make a liquid version by dissolving the same 1:1 mixture into a small amount of water or mixing baking soda with honey or maple syrup to form a paste. Liquid and paste baits can be more attractive to ant species that prefer wet food sources over dry ones. If you’re not sure which type your ants prefer, set out both and see which gets more traffic.
Where to Place the Bait
Put bait directly in the path of ant activity. Look for trails along baseboards, under sinks, behind appliances, near windowsills, and around doorframes. If you’ve spotted ants near a specific cabinet or piece of equipment, place bait nearby rather than across the room. Ants follow chemical trails, so the closer your bait is to their established route, the faster they’ll find it.
Indoors, tuck bait stations in less visible spots where you’ve still noticed ant movement: behind the fridge, under the dishwasher, along the back edge of counters near the wall. Never place bait directly on food prep surfaces or anywhere it could get into a sink drain or pet water bowl. Small jar lids, bottle caps, or pieces of cardboard work well as disposable bait trays.
Outdoors, keep bait sheltered from rain and direct sunlight. Heat, moisture, and UV exposure break down bait quickly, making it unappealing to ants. Check your bait stations every day or two and replace any that look wet, crusty, or ignored.
What to Expect: Timeline and Results
Don’t panic if you see more ants in the first few hours. That’s actually a good sign. It means foragers have found the bait and are recruiting nestmates to the food source. Within about a day, you should notice significantly fewer ants. Over the course of a few days, visible ant traffic typically drops off.
Here’s the catch: the ants you see foraging represent only about 10% of the colony. The queen and developing larvae stay deep in the nest, protected and continuously producing new workers. Even if baking soda kills every ant you can see, the colony itself often survives. This is why ant problems frequently return a week or two after a seemingly successful baking soda treatment. The queen simply sends out a fresh round of workers.
Why It Won’t Eliminate a Colony
Effective ant control requires reaching the queen and the brood inside the nest. Baking soda rarely gets that deep. Unlike commercial ant baits, which use slow-acting toxins specifically designed to be carried back and shared throughout a colony before killing, baking soda tends to kill individual workers relatively quickly. That speed actually works against you. Workers die before they can distribute the substance to nestmates, the queen, or larvae.
For small, seasonal ant problems (a handful of ants wandering into your kitchen on a warm day), baking soda bait can be enough to manage the visible issue. For established colonies, especially species like carpenter ants that nest inside walls, or fire ants with large underground networks, baking soda alone is unlikely to solve the problem long term.
Baking Soda vs. Borax
Borax (sodium borate) is the more commonly recommended DIY ingredient for ant bait, and for good reason. Borax kills more slowly than baking soda, which gives worker ants time to carry the bait back to the nest and feed it to other colony members, including the queen. This slow-kill mechanism is the same principle commercial bait stations use. A borax bait made with sugar water follows the same basic approach: mix borax with a sweet attractant and place it along ant trails. The timeline is similar (noticeable reduction within a day or two), but borax has a better chance of reaching deeper into the colony.
The tradeoff is toxicity. Borax is more toxic to pets and children than baking soda, so if safety is your primary concern, baking soda is the gentler option, even if it’s less effective at colony elimination.
Safety Around Pets and Children
Baking soda is far safer than most pest control products, but it’s not completely harmless in large amounts. For dogs, toxic effects can appear at roughly 2 to 4 teaspoons per kilogram of body weight. In practical terms, a very small dog (under 10 pounds) could show symptoms after ingesting as little as 0.3 tablespoons, while a 50-pound dog would need to consume around 12 tablespoons before reaching a toxic dose. For most cats, the threshold is similarly low at around 0.3 tablespoons for an average-sized cat.
Symptoms of baking soda toxicity in pets include vomiting (usually the first sign), diarrhea, lethargy, tremors, and disorientation, and these can show up within three hours of ingestion. The small amounts used in ant bait stations are unlikely to cause problems for a medium or large dog, but small dogs, cats, and young children could feasibly eat enough from an accessible bait tray to cause trouble. Place bait stations behind or under furniture and appliances where pets and kids can’t easily reach them.
Tips for Better Results
- Keep bait fresh. Stale, dried-out bait gets ignored. Replace it every two to three days, or sooner if it looks degraded.
- Don’t kill the trail. Resist the urge to spray or wipe away the ant trail leading to your bait. You want ants to follow that chemical path straight to the baking soda mixture.
- Remove competing food sources. Clean up crumbs, wipe down sticky surfaces, and store food in sealed containers. Ants won’t bother with your bait if there’s an easier meal nearby.
- Use multiple stations. Place several small bait points rather than one large pile. This increases the chance of intercepting different foraging routes.
- Try different attractants. If ants ignore the powdered sugar mix, switch to honey or peanut butter. Some ant species prefer proteins or fats over sweets, especially at certain times of year.
Baking soda ant bait is a low-cost, low-risk starting point. It works best for minor infestations and as a stopgap while you figure out where ants are entering your home and seal those gaps. For persistent or large-scale ant problems, you’ll likely need a bait with a slow-acting ingredient like borax, or a commercial bait station designed to reach the queen.