Does Borax Kill Ants?

Bill Swank
First Published: | Updated: February 27, 2024

Is there anything more annoying than an ant invasion in your house? These tiny creatures don’t come alone; they follow the trail and invite their entire colony over. If you’ve been struggling with these unwelcome guests, then it might be time for a better solution. You probably have a potent weapon against ants right in your laundry room — borax! Now, you might wonder, “Does borax kill ants?”.

The short answer is yes, and in this piece, we delve into how borax works to slay these pests, how you can create your own borax baits, and important safety measures when using it at home.

  • Borax, also known as sodium borate, is a mineral that’s toxic to ants. While usually used for cleaning, when mixed with an attractant, ants ingest the borax and eventually die.
  • Borax doesn’t kill ants instantly but disrupts their digestion progressively. This slow-acting property allows worker ants to carry the borax back to the colony, where other ants ingest it and die, helping in eliminating the entire colony.
  • The effectiveness of borax baits depends on mixing it with the right attractant, based on the dietary preferences of the specific ant species you are trying to control.
  • While borax is effective, it should be used cautiously, as it can cause harm to humans or pets if ingested or touched. Always place baits out of reach of children and pets.
  • Apart from borax baits, borax can also be used as a spray or solution to effectively deal with ants. Commercially available products tailored for ant control also exist which use borax as a key ingredient.

Table of Contents

Borax as an Ant Control Solution

What is borax and how is it commonly used?

Borax, also known as sodium borate, is a mineral and salt of boric acid. Frequently utilized in cleaning and laundry products , borax is hailed for its powerful antiseptic, fungicide, and disinfecting properties.Whether it’s giving your laundry a fresh boost or deep-cleaning your preferred cookware, borax remains a top choice. But did you know that this versatile compound can double down as a potent ant killer?

What makes borax a candidate for ant control?

Borax’s efficacy as an ant control agent lies in its effect on the insects’ digestive system. This commonly found household item is toxic to ants. When consumed, borax disrupts their digestion, which eventually causes them to die. The perfect blend of poison and slow-acting ability ensures that worker ants have ample time to take the borax back to the colony, thereby eliminating others, including the queen ant. Be advised, though; ants aren’t attracted to the borax per se. You will need to mix it with an attractant like sugar or honey to lure these pesky critters.

How Does Borax Act as an Ant Killer?

Does borax kill ants?

Yes, borax does indeed kill ants. The primary ingredient of many commercial ant baits, borax, possesses the ability to wipe out a whole ant colony. Its efficacy stems from being both a stomach poison and a desiccant, causing dehydration in ants.

How does borax affect ants?

  • Ingestion: When ants consume the borax-laced bait, it acts as a stomach poison and causes them to die slowly.
  • Transmission: Borax works slowly, which ensures the affected ant carrying the borax bait gets ample time to return to the colony and transfer the poison to others before it dies.
  • Secondary Kill: Other ants in the colony, who did not directly feed on the initial bait, consume the poisoned ants and get affected by the borax within them. This leads to a secondary kill effect.
  • Elimination of the Queen Ant: All these actions lead to the biggest prize: the queen ant. When the worker ants bring the borax back to their nest, the queen ant also consumes it. This consumption ultimately leads to her death and a subsequent collapse of the colony, as new ants are no longer being produced.

Bear in mind though, ants aren’t naturally attracted to borax alone. You’ll need to mix it with an attractant such as sugar or honey for them to take the bait. Consider borax as the secret weapon in a dish that seems irresistible to the ants but is, in reality, a lethal trap.

How Can Borax be Effectively Used to Control Ants?

How to use borax to kill ants?

If you’re thinking of using a borax-based bait, here’s some easy recipes you can make at home:

Borax and Sugar Mixture

  1. Mix equal parts borax and powdered sugar (e.g., 1 tablespoon of each).
  2. Sprinkle the mixture near areas where you observe ant activity. Alternatively, mix the borax and sugar with a small amount of water to create a paste, and place the paste on a piece of cardboard or in a shallow dish where ants can access it.
  3. Be patient. It might take some time for ants to find the bait and for the borax to affect the colony.

Borax and Honey Mixture

  1. Combine equal parts borax and honey (again, let’s say 1 tablespoon of each).
  2. Heat up this mixture for 30 seconds in the microwave to get a more liquid consistency.
  3. Use a dropper to apply the bait drops in corners, along ant trails, or other areas of ant activity.

Borax and Peanut Butter Recipe

  1. Mix together equal parts borax and peanut butter (you could possibly start with 1 tablespoon of each).
  2. Add in just a little bit of water, enough to get a dough-like consistency.
  3. Roll this mixture into tiny bait balls and place them where ants visit.

Why should borax be mixed with an attractant?

Ants aren’t naturally attracted to borax. They tend to navigate towards sweet things or protein-based foods which is why mixing borax with an attractant such as sugar or honey is crucial. This combination creates a sweet treat that ants find hard to resist.

Can I kill tiny ants in the kitchen with borax?

Absolutely! A common sight during warmer months, these tiny ants can be quite a nuisance in the kitchen. They too will be attracted to the sweet concoction of borax and sugar or honey. Just like with other ants, the borax will slowly take effect, eventually eliminating the entire colony.

How to deploy the borax and bait and what to expect in terms of results?

You can place your borax bait where you observe ant trails or visible nests, either in a sprinkled form or as a paste. Be mindful, if you have pets or kids, place the bait where they can’t easily reach.

Little by little, ants will begin consuming the bait, and you may even see an increase in the number of ants. Don’t panic! This is a sign the bait is working. It’s essential to resist squashing them; this is part of the process. The worker ants are carrying the bait back to the colony.

After using the borax bait for two weeks to a month, you can expect to see a major reduction in the number of ants. If not, consider switching the bait type or ingredient proportions. Remember, the ultimate goal is to eliminate the queen ant, so be patient and wait for the borax bait to take full effect!

What Types of Ants are Susceptible to Borax?

Does borax kill carpenter ants?

Yes, borax does kill carpenter ants. These ants are drawn to sweet foods, making the borax and sugar mix an effective bait. While it may take longer to kill a carpenter ant colony due to their size and complex colony structure, with patience, the borax bait can exterminate the entire colony.

Is borax effective against fire ants?

While borax can kill individual fire ants, it may not be effective at eliminating an entire fire ant colony. Fire ants are known for their unique food-hunting habits and may not bring enough borax back to the colony to kill the queen.

Can borax kill all types of ants?

Borax is effective in killing every single species of ants that you’re likely to find in your home, including fire ants, carpenter ants, and sugar ants. However, every ant species has different food preferences. Borax mixed with sweet bait should work for most common types of household ants who prefer sugary foods. For other ant species that prefer protein or fat-based foods, borax will need to be combined with a different type of bait. Determining the right attractant is crucial in baiting and killing the targeted ant species.

Are there specific ant species resistant to borax?

As mentioned above, borax proves effective on all types of ant species found in your home, but some species might just not attracted to the bait. Remember, the key to an effective borax bait is to pair it with the right attractant that appeals to the specific species of ants you are trying to control.

Why Might Borax Sometimes Fail to Control Ants?

Why might borax not work on certain ant species or situations?

Even though borax is a potent ant killer, it may not work as effectively in certain circumstances. Here’s why:

  • Wrong Bait Choice: Different ant species have diverse dietary preferences. Some prefer sweet treats, while others are keen on grease or protein. If the bait you’re using doesn’t appeal to them, they likely won’t ingest the borax.
  • Too Much Borax: There’s a bit of a Goldilocks principle here. If you use too much borax in your bait, the ants may die before reaching the colony and transferring the poison to others, especially to the queen ant.
  • Rainy or Humid Weather: Humidity or rain can dilute your borax bait or wash it away, making it less potent.
  • Avoiding Infested Places: Sometimes, borax may not reach the queen if the ants have source to the food or their preferred food outside the bait stations or houses.

How do ants react to different bait preparations?

Ants have specific dietary cycles that vary between proteins and sugars. One strategy that works well is to offer two baits: one sweet and one protein-based. By having their choice of bait, you’re more likely to entice the ants regardless of their current dietary cycle.

What to do if borax is not working on ants?

If you’re not seeing success with borax, it may be time to reassess the situation. You may try changing your bait substance or the ratio of borax to bait. But if all else fails, calling a professional pest control service might be the best route. They utilize strong pesticides and other methods to manage ants and other pest issues.

What alternatives can be used if borax is not effective?

There are endless alternative methods to control and eradicate ants if borax is not proving effective. For instance, diatomaceous earth is a natural powder consisting of fossilized aquatic organisms and is lethal to ants. The powder sticks to the ants’ exoskeleton and absorbs the oils, causing them to dehydrate to death.

Another option is food-grade insecticides. These products will kill ants without any harm to humans or pets. Then, there is the option of using commercially available ant traps or baits, which can be effective.

If your ant problem is particularly large or stubborn, it might be best to engage a professional pest control service to tackle it.

Available Borax Products for Ant Control

Are there specialized borax products tailored for ant infestations?

Yes, there are numerous products in the market made specifically for ant control using borax as a key ingredient. These come in the form of baits, both in solid and liquid forms, that you can easily deploy around your home.

Are there any differences between regular borax and those marketed for ant control?

The major difference lies in the effectiveness. Ant killer products containing borax are already in a formulated bait, meaning you don’t have to mix them with an attractant yourself. They also often come in easy-to-use packaging that allows for strategic placement, making your job a lot easier.

Where can one buy borax specifically for ant control?

Borax products for ant control are widely available. You can find them in various physical stores, including supermarkets, home improvement stores, and gardening centers. They are also widely available online via e-commerce platforms like Amazon and eBay.

Additional Borax-Based Solutions for Ant Control

Borax sprays and solutions: How to prepare and use them to kill ants?

Borax sprays and solutions are easy to prepare and can be an effective method to deal with ants. Here’s a simple recipe you can make:

  1. Dissolve 1 teaspoon of borax and 1 cup of sugar in half a gallon of warm water. Stir until everything is thoroughly dissolved.
  2. Fill a spray bottle or a squirt bottle with the solution.
  3. Spray it or squirt it on the areas where you see the ants.

However, be cautious when using borax sprays or solutions around food and drink areas.

How effective is a borax spray or solution compared to dry bait?

Borax sprays and solutions can eliminate ants on contact but unlike borax baits, they may not always reach the ant colony’s root. That’s why using borax baits is often more effective at wiping out an entire ant colony.

You might see an immediate reduction in ants with the spray, however this could simply mean it’s killing the foraging ants and not eradicating the entire colony. The dry bait is slower but tends to be more effective over the long run.

Is Borax a Safe Solution for Ant Control?

How safe is borax as a method to kill ants for humans and pets?

While borax is a natural substance, that doesn’t mean it’s entirely safe. If ingested by pets or humans, it can cause harm especially in larger amounts. It can irritate the skin and eyes, and also can cause upset stomachs if ingested. As such, it’s crucial to use borax with care, particularly making sure it’s out of reach of pets and small children.

Where to place borax baits to avoid accidental ingestion?

Maintaining safety when using borax baits is paramount. Place baits in areas where children and pets don’t frequent. Some safe areas can include:

  • Under the refrigerator
  • Under the sink
  • Inside kitchen cabinets that the kids can’t reach
  • Garden areas where pets don’t venture

Remember to use borax responsibly and to always keep an eye on where the baits are placed.

What are the potential drawbacks of using borax for ants?

While borax is a practical, cost-effective solution for ant control:

  • It may take a little while to see results.
  • It requires proper handling and safe placement to avoid risks to non-target organisms.
  • It may not be as effective on some species of ants or large colonies.
  • It cannot prevent future infestations.

What are the safety measures to consider when using borax to kill ants?

When using borax for ant control, keep these safety tips in mind:

  • Store borax and borax baits out of reach of children and pets.
  • Don’t use borax sprays near food or food preparation areas.
  • Always wash your hands after handling borax.
  • Don’t spread borax powder loosely if there’s a risk of contamination with surfaces used by people or pets.

Always use caution when handling chemicals, even those found around the house like borax, and read any warnings or instructions on the packaging.

How Effective Is Borax Against Ants?

How effective is borax for killing ants?

Borax proves to be highly effective for killing common household ants. It’s important to remember its efficiency does not yield immediate results. Unlike some pesticides, borax doesn’t kill on contact. Instead, ants carry the borax bait back to the colony, ensuring its distribution among other ants. This slow kill allows the poison to reach the heart of the colony, including the queen, and wipe it out over time.

How does borax compare to other natural ant killers?

Compared to other natural ant killers, such as vinegar or essential oils, borax stands out for its effectiveness over a longer period. While natural alternatives may repel ants and temporarily disturb their trails, they don’t typically provide a long-lasting solution and will not eliminate the colony.

Borax, however, divided the ants’ exoskeletons and digestive systems making it a more effective and lethal option.

Does borax kill ants instantly?

No, borax doesn’t kill ants instantly. While this might seem like a drawback, it’s actually to your advantage. The slow-acting property ensures that ants remain alive long enough to carry the bait back to their colony. There, it’s shared with other ants, eventually leading to the demise of the whole colony, including the queen ant.

Can borax completely eradicate an ant infestation?

Yes, borax can completely eradicate an ant infestation due to its slow-acting nature. Worker ants have the time to take the bait back to their colony, which is shared with other ants, leading to a large-scale, effective kill off. However, remember that while the borax bait may destroy one colony, it may not deter new colonies from forming. For a long-term solution, partner the pest control efforts with deterrent measures to repel ants initially.

How can I use borax to kill ants effectively?

To best use borax for ant control, follow these steps:

  • Identify the areas where ants are active.
  • Create a borax-based bait using sugar or a food source that appeals to the specific species of ants you are dealing with.
  • Apply the bait in the areas where you’ve seen ant activity. Remember to use proper proportions of borax to avoid killing ants before they can bring the poison back to the nest.
  • Be patient. It may take a bit of time to see the results as the ants carry the bait back to the colony.
  • Monitor the areas for continued activity and reapply bait as needed.

Just remember that while borax is highly effective at killing ants, it might not always be enough to control larger or multiple infestations. In those cases, a combination of pest control methods might be needed and it might be time to call in the professionals.


Borax is an effective, affordable, and accessible solution for combating ants in your home. While it doesn’t provide an instant kill, its slow-acting nature ensures that it reaches all the members in a colony, including the queen, effectively eradicating the entire ant infestation. Remember, success may not be immediate, but it’s usually worth the wait.

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