Does Diatomaceous Earth Kill Ants?

If you’ve been dealing with an ant problem and looking for a natural solution, you’ve probably come across diatomaceous earth (DE). But what is diatomaceous earth exactly? It’s a naturally occurring, soft sedimentary rock made from the fossilized remains of tiny aquatic organisms called diatoms. When crushed into a fine powder and applied around your home, it works by physically breaking down and drying out the exoskeletons of ants and other insects, with no harsh chemicals involved. That’s what makes it such an appealing option, especially in homes with kids or pets.

So does diatomaceous earth kill ants? Yes, but it works slowly and only under the right conditions. Ants have to walk directly through the powder for it to be effective, and it typically takes 48 to 72 hours to do its job. Moisture is its biggest enemy—in Florida’s humid climate, DE can clump up quickly and lose its effectiveness entirely. It also won’t do much against a large or established infestation.

If you do decide to try it, start outside—dust it around the foundation perimeter of your home near entry points before tackling the inside. Use insect-grade DE, not food-grade or pool-grade, and always wear a dust mask and gloves during application. Once the ants are gone, clean up the DE and wipe down the ant trails with a cleaning solution, since the invisible pheromone trails they leave behind will keep drawing more ants back if you don’t.

For a persistent ant problem that DE just can’t handle, it’s time to bring in the professionals. Florida Pest Control can identify the species, locate the colony, and apply targeted treatments that actually break the cycle for good.