Baking soda and cinnamon work against ants in two very different ways. Baking soda acts as a killer when mixed with a sweet bait, while cinnamon works purely as a repellent that drives ants away from treated areas. Using them together gives you a simple one-two approach: cinnamon to block entry points and baking soda bait to reduce the population.
How Baking Soda Kills Ants
Ants won’t eat plain baking soda, so you need to disguise it. The standard method is mixing equal parts baking soda and powdered sugar. The sugar draws ants in, and the baking soda does the damage. When ingested, the sodium reacts with acids inside the ant’s body, causing a chemical reaction that dehydrates its exoskeleton and kills it.
To set up the bait, place the mixture in shallow dishes, jar lids, or bottle caps near ant trails or wherever you’ve spotted activity. Adding a few drops of water to make a paste can help, though a dry mix works fine too. Ants will carry some of the mixture back to the colony, which can kill additional ants beyond the ones feeding directly at your bait station.
There’s an important limitation here: baking soda bait kills individual ants but typically won’t wipe out an entire colony. The queen, buried deep in the nest, may never get a lethal dose. You should start seeing fewer ants within a couple of days, but expect to maintain bait stations for a week or more to make a real dent.
How Cinnamon Repels Ants
Cinnamon doesn’t kill ants. Instead, it overwhelms their scent trails. Ants navigate by following chemical signals left by other colony members, and the strong smell of cinnamon disrupts that communication. When ants encounter a line of cinnamon, they’ll typically turn around rather than cross it.
Sprinkle ground cinnamon along windowsills, doorframes, baseboards, and any cracks where ants enter your home. You can also use it outdoors around the perimeter of your house or near visible ant nests. The main downside is that cinnamon loses its potency as the oils evaporate, so you’ll need to reapply every few days indoors and after any rain or watering outdoors.
Cinnamon essential oil works too, often more potently than ground spice. A few drops on a cotton ball placed near entry points can hold ants off for longer than a dusting of powder.
Using Both Together
The most effective strategy is to use cinnamon as a barrier and baking soda as a trap, but keep them in separate locations. This part matters: if you sprinkle cinnamon right next to your baking soda bait, you’ll repel the ants before they ever reach the poison. Place your baking soda and sugar mixture directly on active ant trails where ants are already foraging. Then use cinnamon to seal off the entry points you want to block, like gaps under doors or cracks in walls.
This creates a funnel effect. Ants that find their usual paths blocked by cinnamon will search for alternatives, and if your bait stations are positioned along those alternative routes, more ants encounter the baking soda mixture.
Safety Around Pets and Children
Both ingredients are safe for households with pets and kids. Baking soda does not harm pets in the small amounts they might encounter from a bait station. Cinnamon is also considered safe for dogs and cats when used as a surface repellent. That said, keep bait stations in spots where pets won’t lick them clean, partly because the sugar will attract curious animals and partly because you want the bait available for ants, not your dog.
This safety profile is the main reason people reach for baking soda and cinnamon instead of commercial ant baits, which often contain borax or synthetic insecticides that require more caution around animals and small children.
When These Remedies Fall Short
Baking soda and cinnamon work best for small-scale ant problems, like a trail of sugar ants heading toward your kitchen counter. They’re less effective against large, established colonies, carpenter ants causing structural damage, or fire ants in your yard. In those cases, the colony’s size and the queen’s reproductive rate outpace what a passive bait station can handle.
If you’ve been running bait stations for two weeks and the ant activity hasn’t changed, the colony is likely too large or too far from your bait for this approach to work. Outdoor nests can house hundreds of thousands of ants, and a dish of baking soda and sugar simply can’t process enough of the population to matter at that scale. Professional treatment or commercial bait systems designed to reach the queen become more practical options for infestations that don’t respond to home remedies.