Does diatomaceous earth kill ants? If you find yourself asking this question, you’re in the right place. The short answer is – yes. Diatomaceous earth is very effective at killing ants and other crawling insects. It’s so effective, the Canadian government has suggested diatomaceous earth as an alternative to chemical pesticides for ant control. It not only gets the job done, but it’s not toxic to humans or pets. Let’s take a closer look at exactly how diatomaceous earth kills ants and the best practices for outdoor and indoor applications.

How To Eliminate Ants With Diatomaceous Earth?

Time needed: 30 minutes.

Be sure to clear weeds, debris, and anything else on the ground around the 1 foot radius at the foundation of the home.

  1. Apply around the foundation

    Apply diatomaceous earth so that is visible and uniform. Please do not apply it thick, just enough to see it.  Go about 1 foot out from the start of the foundation

  2. Apply to door & window frames

    Apply to door frames and window frames on the outside using our Pest Pistol Powder Duster

  3. Apply to yard (optional)

    (Optional) Apply Diatomaceous Earth using a fertilizer spreader to your yard.  Be sure you mix some sand or fine dirt in with the product to make flow correctly through the spreader.  Apply an application that is visible and be sure to reapply every week for 1 month.

  4. Apply to baseboards

    On the inside of the home take our Pest Pistol Powder Duster and apply to all the cracks and crevices along the baseboards of your home and also focus on the window sills and door frames. It doesn’t hurt to place an even and visible line of the product in front of the baseboards also.

How Diatomaceous Earth Kills Ants

If you’re wondering how a fine powder-like substance can effectively control ants, you’re not alone. Ants and other crawling insects have a waxy outer layer that covers their bodies. The sharp microscopic particles that make up diatomaceous earth pierce through the waxy coating and cause the insect to die from dehydration. The ant must come in contact with diatomaceous earth for it to work, so strategic placement is key.

Indoor Diatomaceous Earth Ant Treatment

Ants are one of the most common insects to invade homes. They generally enter your home looking for food. The first thing to do is identify areas around your house where you have seen ants crawling. Also, look for possible entrance areas like cracks around doors. Once you have identified ant traffic areas apply diatomaceous earth in an even and light application using a Pistol Powder Duster, available in our Crawling Insect Pest Control bundle. Baseboards, window sills, and doorways are the best places to apply diatomaceous earth for indoor ant control. Leave the application for seven days then clean up the dust. In most cases, the ant problem will be eliminated. If you see more ants try a second application. The ants will eventually realize there’s no food and move on.

Outdoor Diatomaceous Earth Ant Control

If you want to stop ants before they enter your home, you can also use diatomaceous earth outdoors. First, start by clearing weeds, debris, and anything else on the ground around the one-foot radius of your home’s foundation. Apply a light dusting application of diatomaceous earth around the entire perimeter of your home’s foundation – make sure to apply it one foot in width for optimal coverage. After you’ve covered your home’s perimeter apply diatomaceous earth to your home’s door and window frames using the Pest Pistol Powder Duster. If you have discovered several ant piles throughout your yard, you can mix some fine dirt with diatomaceous earth and spread it with a fertilizer spreader to larger area applications.


Diatomaceous earth has been proven to be a very effective treatment for ant control. Because diatomaceous earth is non-toxic and safe for children and pets, you can use it indoors as well as outdoors without any worries.