If you’ve spotted ants marching across your kitchen counter, you might wonder if that box of baking soda in your pantry could fix the problem. Many homeowners reach for it when they first notice ant trails, especially in spring when ant activity picks up.
Does baking soda kill ants? The short answer is yes, but it’s not as simple as sprinkling some powder. While baking soda can kill individual ants under the right conditions, it rarely gets rid of entire colonies.
In my years helping homeowners with ant problems, I’ve noticed most people try DIY fixes before calling a pro. Kitchen and bathroom areas tend to be the first spots where ants show up, and many folks have already tried baking soda by the time they reach out to us. For more on this topic, see our article on whether baking soda will kill ants.
How Baking Soda Works Against Ants
Baking soda (sodium bicarbonate) affects ants in two main ways. Knowing these helps explain why results can be hit or miss.
pH Disruption
When ants touch baking soda, it throws off their body’s pH levels. This shift is lethal over time.
According to research from the Journal of Economic Entomology, fire ants exposed to sodium bicarbonate showed body pH jumps from 6.97 to 7.9. The study found it took about 7.11 mg per square centimeter to kill half the test ants within seven days. But this required the ants to stay in contact with the powder for a long time.
Gas Production Theory
Some sources say baking soda reacts with formic acid in ant stomachs, making carbon dioxide gas that damages them from the inside. While this idea appears in many DIY guides, there’s no peer-reviewed research to back it up.
What the Research Actually Shows
Lab tests showed 42-99% death rates in fire ants and Argentine ants within 6-7 days when they were trapped on treated surfaces. The key word is “trapped.” The ants couldn’t escape the treated area.
When researchers tested baits with 5-7% baking soda, the kill rate dropped to around 50%. This tells us that contact works better than eating it for baking soda ant control.
No published studies have tested baking soda in real homes. Most success stories come from blogs and magazines, not controlled research.
How to Make Baking Soda Ant Baits
If you want to try baking soda for ants, proper prep helps. Here are the best methods based on what we know.
Mix equal parts baking soda and powdered sugar, about 1 tablespoon of each per station. The sugar draws ants in while the baking soda does the killing.
Powdered sugar works better than granulated because it blends more evenly. Put the mix in shallow bottle caps or small dishes.
For ants that prefer liquids, mix 1 tablespoon each of sugar, water, and baking soda. Stir well and put it in shallow containers near ant trails.
This works better for some species, especially during hotter months when ants seek out moisture along with food.
Where to Place Baits
Put baits along ant trails, near baseboards, and around pipe openings. Kitchen areas need special attention since food prep happens there.
Look for trails behind appliances and near plumbing. These spots give ants easy access while keeping baits out of the way.
Checking and Replacing
Check baits every 3-4 days and swap them out when they clump or get wet. Baking soda stops working when it soaks up moisture.
Give it 5-10 days before judging results. Watch trails at night with a flashlight since many ants are more active after dark.
- Mix: Equal parts baking soda and powdered sugar (1 tbsp each)
- Placement: Along trails, near baseboards, around pipe gaps
- Keep Away: Place where ants can reach but pets and kids can’t
- Refresh: Replace every 3-4 days, especially if wet or clumped
- Wait Time: Allow 5-10 days before expecting any change
Baking Soda vs Other Methods
Knowing how baking soda stacks up against other options helps set realistic expectations.
| Method | Kill Rate | Time to Results | Colony Elimination |
|---|---|---|---|
| Baking Soda | 40-60% workers | 5-10 days | Rare |
| Boric Acid | Much higher | 5-7 days | Good |
| Professional Gel Baits | 90%+ | 3-5 days | Excellent |
Boric acid treatments generally outperform baking soda by a wide margin. Boric acid achieves strong colony suppression within 7-14 days when applied correctly. Baking soda typically kills 40-60% of worker ants in lab conditions, with worse results in real homes.
Commercial gel baits with fipronil, indoxacarb, or thiamethoxam reach over 90% effectiveness within 3-5 days. These non-repellent products spread through colonies as workers share food.
Why Baking Soda Often Falls Short
Several factors explain why homeowners often see early success followed by ants coming right back.
You’re Only Killing the Workers
The ants you see foraging are only about 10% of the colony. Even if baking soda kills every ant in sight, the queen and developing larvae stay protected in the nest. They just send out new workers.
Good ant control requires reaching the whole colony. Baking soda rarely gets into nest areas where the queen lives and new ants develop.
Ants Change What They Eat
Ants shift their food needs based on the season and species type. Spring colonies often want sugars, but summer needs may shift to proteins and fats.
If their tastes change, ants may skip your sugar-based baking soda baits entirely. Professional treatments account for these shifts by using different bait types.
Common Ant Species and How They Respond
The most common indoor ants in our area include odorous house ants, pavement ants, and carpenter ants. Each one responds differently to baking soda.
Odorous house ants prefer sweets and may take baking soda baits at first. But their multi-queen colonies make full removal tough without professional help.
Pavement ants often nest in foundation cracks and may not run into indoor baits enough for real control. Carpenter ants pose a risk to wood in your home that baking soda simply can’t address.
When to Call a Professional
Some cases need expert help rather than more DIY tries.
Carpenter ant activity is serious. These ants dig into wood to build nests, which can damage your home’s structure over time. If you see sawdust piles, hollow-sounding wood, or hear rustling in walls, you need professional treatment.
Trails that won’t quit after two weeks of proper baiting and cleaning point to nearby outdoor nests that need targeted treatment.
I often work with homeowners who’ve tried several DIY methods before calling us. Professional treatments address the root causes, like moisture problems and entry points, that keep drawing ants back.
Prevention Tips
Good ant control uses multiple strategies, not just one fix.
Clean up food: Wipe spills right away. Store sweet items in airtight containers. Even tiny crumbs can feed an ant colony.
Seal entry points: Caulk gaps around pipes, windows, and foundation cracks. Prevention often works better than reactive treatment.
Fix moisture: Repair leaky faucets, improve airflow, and clear standing water around your home. Ants need water and will seek it out.
Setting Realistic Expectations
Baking soda may cut down visible ant activity for a while, but full colony removal rarely happens. Most homeowners I work with report early decreases followed by ants returning within 2-3 weeks.
Professional treatments give faster, more complete results because they target whole colonies with proven methods. Licensed techs also find and fix the conditions that bring ants to your property in the first place.
Baking soda works best as a stopgap while you plan a more complete solution. It’s rarely enough on its own for lasting relief.
If you’re dealing with stubborn ant problems or want faster results, call us at 703-683-2000 or email info@bettertermite.com. We’ll inspect your home and build a plan that fits your needs.
