Does Baking Soda Kill Ants? What the Evidence Says

Every few years a natural remedy goes viral online, and baking soda as an ant killer has had its moment. The claim usually involves mixing baking soda with powdered sugar to attract ants, with the theory that baking soda reacts with the acid in their digestive system to produce lethal carbon dioxide gas. It sounds plausible. But does it actually work?

For a comprehensive overview, see our Complete Guide to Ants.

The Claim

The popular claim: ants ingest baking soda (sodium bicarbonate), which reacts with formic acid or other acids in their digestive tract to produce carbon dioxide gas, killing them. The most common formulation suggests mixing baking soda with powdered sugar to attract ants to the mixture.

Does Baking Soda Actually Kill Ants?

The short answer is: weakly at best, and not in any way that addresses the colony.

The Digestive Chemistry Problem

The chemistry premise has a significant flaw. Ants do not have a highly acidic digestive environment. Some ants produce formic acid as a venom or defensive spray, but that's external — the digestive system of an ant doesn't contain strong acid concentrations sufficient to trigger a meaningful reaction with ingested baking soda.

Research on insect physiology, including resources from NIH, does not support the idea that sodium bicarbonate produces lethal gas reactions inside ant digestive tracts. The ant's gut simply doesn't provide the acidic environment the claim requires.

Limited Desiccant Properties

Baking soda may have minor desiccant (drying) properties when applied directly to insects, but it's far weaker in this regard than diatomaceous earth, which physically damages the ant's waxy cuticle to cause fatal moisture loss. As a contact desiccant, baking soda is not a reliable control tool.

Colony vs. Individual Kill

Even if baking soda killed individual foraging ants that consumed it, this would not address the colony. Worker ants are expendable — a healthy colony replaces hundreds of killed workers without any impact on overall population. Effective ant control must reach the queen. Without a mechanism that brings lethal material back to the nest and queens, contact kills of individual workers are cosmetic, not curative.

Comparison: Baking Soda vs. Proven Methods

What Actually Works

Borax-Based Bait

Borax is the natural alternative most similar in premise to the baking soda claim — but it actually works. A mixture of borax (5–10%) with powdered sugar or a sugar-water solution is ingested by workers, who carry it back to the colony. Borax disrupts digestive enzyme function after ingestion, slowly enough that workers have time to return to the nest and share the bait before dying. This colony-level delivery is what makes borax effective where baking soda is not.

According to UC IPM, borax-based baits are among the most studied and effective DIY options for common household ants, provided the concentration stays low enough — below roughly 5% for most species — that workers don't die before returning to the nest.

Diatomaceous Earth

Diatomaceous earth is a physically-acting insecticide that damages the waxy cuticle of ants, causing fatal dehydration. Most effective as a dry barrier powder at entry points, it doesn't reach the colony but suppresses forager populations at specific crossing points.

Commercial Baits

Commercial ant baits with slow-acting active ingredients (indoxacarb, hydramethylnon, fipronil) are the gold standard for colony-level control. They're formulated to be attractive to target species at concentrations that allow workers to return to the nest before dying. See how to kill ants for a full comparison of available products and which species each targets.

Other Viral Natural Remedies: A Quick Reality Check

While baking soda gets the most attention, several other household substances regularly circulate online as ant killers. Most share the same fundamental limitation: they kill individual foragers without affecting the colony.

Dish soap and water: A soapy water spray kills ants on contact by disrupting their exoskeleton's surface tension and blocking spiracles (breathing pores). It's genuinely lethal to workers on contact — but has no residual effect and reaches nothing back at the nest. Use it to clear a surface quickly, not to solve an infestation.

Coffee grounds: Widely claimed to repel ants, but field evidence is mixed. Some species avoid fresh coffee grounds temporarily, but the effect is unreliable as a control measure. Grounds near an entry point may redirect a trail for hours; they won't stop a motivated colony.

Peppermint oil: Peppermint disrupts pheromone trails when applied directly to them and deters ants in treated areas for short periods. It can serve as a temporary entry-point deterrent applied to door thresholds and window sills. See our essential oils for ants guide for what has documented support.

Cinnamon: Ground cinnamon and cinnamon oil can disrupt trail pheromones and deter ants from crossing treated areas for hours to a day. Like vinegar and peppermint, it's a disruption tool, not a control method. See cinnamon for ants for practical application details.

The common thread: disruption tools have a role in temporarily redirecting foraging behavior. None of them reach the colony — which is the only thing that matters for lasting results. Use them as supplements to bait, not replacements for it.

Is Baking Soda Useful for Anything in Ant Control?

There is one legitimate use of baking soda adjacent to ant control: topical relief for ant stings. A paste of baking soda and water applied to fire ant stings can reduce itching and some of the burning sensation by neutralizing venom acids on the skin surface. This is a comfort measure, not a control strategy — but it's worth knowing. Baking soda paste is also a low-risk option for children or individuals who react badly to commercial hydrocortisone creams. Mix a small amount with water to form a thick paste, apply directly to the sting site, and let it dry. The alkaline pH helps counteract the acidic components of fire ant venom and reduces the burning sensation. Reapply as needed for the first few hours after stinging. See our ant bites guide for a full treatment overview.

According to the EPA, integrated pest management — combining exclusion, habitat modification, and targeted treatment — produces the best results for household ant infestations. DIY remedies that don't address the colony consistently underperform compared to baits that do.

In my 15 years of pest management work, I've been asked about baking soda for ants more times than I can count. My standard answer: save it for the sting relief paste and get a proper borax bait or commercial gel bait for the infestation itself. The baking soda claim is appealing because it uses a household product, but the mechanism doesn't hold up under scrutiny — and more importantly, even if it worked as claimed, it would only kill the ants you can see, not the tens of thousands you can't.

Addressing the colony is the only path to lasting control.

How to Identify

Before applying any baking soda treatment, identify the ant species and its food preference. Small brown or black ants trailing to sweet food sources in the kitchen respond to sweet-based attractants, making them candidates for a baking soda and powdered sugar mixture. Larger ants near wood, or tiny pale yellow ants distributed throughout multiple rooms, indicate carpenter ants or pharaoh ants respectively, and neither responds effectively to baking soda mixtures. Observe where the trail enters the wall or foundation: this shows you where to place the bait mixture for maximum effectiveness rather than applying it to open surfaces where it dries out quickly and loses attractiveness.

Risk and Severity

Baking soda mixed with sugar is non-toxic to people and pets in the concentrations used for ant control, making it a low-risk option in households with children and animals. However, its effectiveness is limited: the CO2 produced when baking soda contacts ant digestive acid may kill individual ants, but the mechanism has not been validated at colony-killing concentrations in field conditions. If baking soda mixtures are used as the primary treatment for a significant infestation, the main risk is delayed control while the colony continues growing and becoming more thoroughly established inside the structure.

Prevention

No baking soda application prevents ants from entering or establishing; it is a reactive treatment, not a preventive one. True prevention requires removing food and moisture attractants, sealing entry points, and applying perimeter insecticide or bait before an infestation begins. Clean kitchen surfaces daily, store all food in sealed containers, fix leaky pipes, and caulk foundation cracks and gaps around utility penetrations. Apply fresh perimeter caulk each spring. If baking soda treatments are your preference during an active infestation, pair them with sanitation and exclusion to address the conditions sustaining the colony alongside the surface treatment.

Main Causes

Indoor ants activity typically traces to outdoor colonies in mulch beds, lawn soil, decking voids, or wall cavities near the foundation. Scouts enter through gaps under doors, foundation cracks, utility penetrations, and damaged weatherstripping when food residue, water from leaks, or warmth from heating runs is available inside. Pheromone trails reinforce within hours of a successful foraging trip, drawing dozens to hundreds of workers along the same route. Heavy rain, drought, or disturbance to an outdoor nest pushes whole colonies inside in pulses. Sweet residue on counters, unsealed pantry items, pet food bowls left out overnight, and leaking pipes are the most common triggers, and the closer an outdoor colony sits to the structure, the harder the pressure becomes to manage.

Solutions and Actions

Effective ant control combines bait, perimeter exclusion, and sanitation rather than relying on contact sprays. Identify the species first because bait selection depends on the colony's current dietary preference — sweet baits for odorous house ants and Argentine ants, protein-based or grease baits for thief ants, multi-bait stations for opportunistic species. Place bait stations directly on active trails, not in random locations, and allow workers to carry the slow-acting active ingredient back to the colony untouched — avoid spraying anywhere near bait. Treat outdoor satellite nests within twenty feet of the structure with a non-repellent residual. Seal entry points only after bait has had time to reach the colony, otherwise foragers seal their access while the colony continues producing replacements.

Frequently Asked Questions

Why do people think baking soda kills ants?

The claim circulates because the theoretical mechanism (acid-base reaction, carbon dioxide production) sounds plausible, and it has surface similarities to borax bait, which genuinely works. The key difference is that borax is a proven digestive disruptor at the colony level; baking soda lacks documented effectiveness against ant digestive biology.

Is baking soda safe to use around pets?

In the small quantities used in ant bait mixtures, baking soda is non-toxic to dogs and cats. This is one of the few scenarios where a baking soda mixture is safer than commercial bait products — though also less effective. Keep all bait, natural or commercial, away from pets and children regardless of active ingredient.

What is the safest effective ant killer?

Borax-based bait is among the safest effective options for indoor ant control. Boric acid (closely related) is widely available in gel bait form. Both have low toxicity to mammals at the concentrations used in ant baits. For persistent or difficult infestations, a licensed professional pest control technician can apply targeted treatments not available over the counter.

Why do baking soda ant recipes often fail in real kitchens?

Baking soda mixtures depend on ants accepting and carrying enough of the bait, which is unreliable because colonies shift between sugar, grease, and protein needs. Even when workers feed on it, the mixture may not reach the queen in a dose that affects the colony.