Does Diatomaceous Earth Kill Spiders? Find Out Now!

If you’re wondering whether diatomaceous earth can effectively kill spiders and keep your home free from these eight-legged creatures, you’ve come to the right place. Diatomaceous earth (DE) is a natural substance made from fossilized marine organisms that have sharp, microscopic edges. It’s not only effective against spiders but also pests like ants, fleas, and roaches.

When spiders, fleas, or other pests come into contact with DE, it cuts their exoskeleton, leading to dehydration and death. It’s a safe and non-toxic way to eliminate them without harming humans or animals.

To use DE for areas where spiders are likely to enter, such as around doors and windows or in cracks and gaps. The DE should be spread in a thin layer to encourage spiders to walk through it. It’s important to keep the DE dry for it to remain effective. Additionally, DE can be used in combination with other pest control methods, such as sealing cracks, decluttering, vacuuming eggs, and removing spider webs. Vinegar and essential oils can also be used as natural repellents.

While you’re dealing with spiders, you might also come across other pests in damp areas of your home, like little black worms in the shower. It’s essential to address all pest issues for a holistic approach.

Key Takeaways:

  • Diatomaceous earth is an effective and safe way to kill spiders.
  • DE is made from fossilized marine organisms with sharp, microscopic edges.
  • Spiders die from dehydration when they come into contact with DE.
  • To use DE for spider control, apply it in areas where they are likely to enter.
  • Keep the DE dry for it to remain effective.

Using Diatomaceous Earth for Spider Control

To effectively eliminate these invaders from your home using DE, it’s important to know the best practices for application and how to enhance its effectiveness in combination with other natural methods. Diatomaceous earth (DE) is a powerful natural remedy used to kill spiders. It works by cutting the exoskeleton of spiders, leading to their dehydration and eventual demise.

 Here are some tips for using DE to get rid of them and keep them at bay.

  1. Identify problem areas: Begin by inspecting your home for areas where spiders are likely to enter, such as cracks, gaps, windowsills, and doorways. These are the spots where you should focus your DE application.
  2. Proper application: Once you’ve identified the problem areas, sprinkle a thin layer of DE along the entry points and any other areas where they are commonly found. Be sure to wear a mask to avoid inhaling the dust. Remember, DE works when spiders come into contact with it, so applying it in a way that encourages their movement is crucial.
  3. Enhance effectiveness: While DE is effective on its own, you can further enhance its spider-repelling properties by combining it with other natural methods. For instance, vinegar is known to repel insects, so spraying it around your windows and door frames can complement the use of DE. Additionally, essential oils like peppermint, lavender, and tea tree oil can be mixed with vinegar or water and applied in areas where they are prevalent.

Maintaining a spider-free environment

The use of diatomaceous earth is just one part of an overall spider control strategy. To prevent spiders from returning, it’s essential to maintain a clean and clutter-free environment. Regularly vacuuming any eggs, removing cobwebs, and sealing any cracks or gaps can help ensure that they have limited opportunities to enter your home. By combining these practices with the use of diatomaceous earth and other natural repellents, you can effectively keep spiders at bay and enjoy a spider-free living space.

Natural Spider RepellentsBenefits
Diatomaceous EarthSafe, non-toxic, and effective against spiders
VinegarNatural spider repellent that can be used in combination with DE
Essential OilsPeppermint, lavender, and tea tree oil can be used to enhance the effectiveness of DE

How to Apply Diatomaceous Earth for Effective Spider Control

If you’re already acquainted with the formidable power of (DE) against spiders, you might be eager to know the most effective way to apply it. Utilizing DE properly can be the difference between a spider-infested and a spider-free home. Let’s dive into the specifics of the application.

  1. Safety First: Before you start, wear a mask to prevent inhaling DE dust. Although it’s non-toxic, breathing in any kind of dust can be uncomfortable.
  2. Pinpoint Problem Spots: Observe where you frequently spot spiders. Check for areas like corners, basements, or even spaces under furniture. Remember, the key is to target their hideouts and usual pathways. If you’re specifically dealing with a spider problem in your basement, you might want to check out these specialized tips on how to get rid of spiders in the basement.
  3. Application: Using a duster or your hand, sprinkle a fine layer of DE onto the identified spots. Ensure it’s a thin layer because a thick pile might deter spiders from walking through.
  4. Focus on Entry Points: DE isn’t just for inside your home. Sprinkle it around potential entry points like windowsills, door thresholds, vents, and cracks in walls. This acts as a preventative barrier.
  5. Maintenance: Reapply DE after cleaning or if it gets wet. Its effectiveness reduces when damp.
  6. Monitor: Over the next few days, observe the spider activity. If you still notice a significant number, consider reapplying in those areas. Remember, patience is key. It might take a few days to notice a drastic reduction.
  7. Complementary Strategies: While DE is potent, coupling its application with other spider deterrents, like essential oils or vinegar, can enhance its effectiveness. By creating an environment that’s not just harmful but also unattractive to spiders, you’re doubling down on prevention.
  8. Clean Up: Once you’re satisfied with the results, use a damp cloth or mop to clean up excess DE. Store any leftover in a dry place for future use.

Is Diatomaceous Earth Safe for Pets and Children?

The question of safety is always paramount, especially when we’re talking about the well-being of our little ones and furry friends. (DE) has gained considerable attention as a natural insecticide, but how safe is it for pets and children? Let’s delve into this.

Food Grade vs. Filter Grade

First and foremost, it’s essential to differentiate between the two main types of diatomaceous earth: food grade and filter grade.

  1. Food Grade DE: This is the type of DE most commonly recommended for pest control around the home. It’s considered safe for consumption by both humans and animals. In fact, some people even add small amounts to their diet or their pets’ diets for various purported health benefits.
  2. Filter Grade DE: This variant is processed differently and is used primarily for filtering, especially in pools. It contains added chemicals and has a much higher silica content. This type of DE is not safe for consumption or use around the home and should be avoided for such purposes.

Safety Concerns & Precautions

  1. Inhalation: While food grade DE is non-toxic, it is a fine powder and can be easily inhaled. If inhaled in large quantities, it could irritate the lungs. Always utilize DE in well-ventilated areas, and consider wearing a mask during application. Keep children and pets away during the application process to prevent them from inhaling the dust.
  2. Contact: DE can dry out the skin upon contact. If you or your pets get it on your skin, simply wash it off. If it gets into the eyes, it can be irritating, so rinse thoroughly with water.
  3. Ingestion: If pets or children accidentally consume small amounts of food grade DE, it’s generally considered safe. However, large amounts might lead to digestive tract discomfort. Always store DE out of reach of children and pets.
  4. Outdoor Use: If you’re employing DE in your garden or yard, know that it can impact beneficial insects as well. Apply it judiciously and try to target problem areas specifically.


For those with a fear of spiders, diatomaceous earth (DE) stands out as a natural and effective method for spider eradication in homes, offering a safer alternative to chemical treatments. Derived from fossilized marine life, DE’s microscopic sharp edges pierce spider exoskeletons, leading to their dehydration and death. Interestingly, lighting can also play a role in attracting or repelling spiders. Ever wondered if LED lights attract spiders? Find out more about it here.

For optimal results, apply DE in spider-prone areas, such as near doors, windows, or cracks, ensuring it remains dry. While DE alone is powerful, its effectiveness is amplified when combined with other pest control practices like sealing openings, cleaning, and using natural repellents like vinegar or essential oils. Although DE is non-toxic, always use caution during application to prevent inhalation.

In summary, diatomaceous earth offers a potent, eco-friendly solution to spider infestations, ensuring homes remain spider-free without the need for chemicals.

For more insights on dealing with various bugs in the house, check out our comprehensive guide.


1. What is diatomaceous earth?

Diatomaceous earth is a naturally occurring sedimentary rock that is made up of the fossilized remains of diatoms, a type of hard-shelled algae. It is commonly used in pest control for its ability to damage the exoskeletons of insects, including spiders.

2. How does diatomaceous earth kill spiders?

Diatomaceous earth works by making tiny cuts on the exoskeleton of spiders and other insects, which leads to dehydration and ultimately death. When spiders crawl through diatomaceous earth, the powder adheres to their bodies and causes damage, effectively killing them.

3. Can I use diatomaceous earth to get rid of spiders?

Yes, you can use diatomaceous earth to kill spiders and effectively eliminate them from your home. Sprinkle a thin layer of diatomaceous earth around areas where insects are commonly found, such as corners, baseboards, and entry points.

4. Do spiders develop resistance to diatomaceous earth?

They do not develop resistance to diatomaceous earth. Unlike chemical pesticides, diatomaceous earth works physically by damaging the exoskeleton and dehydrating them. Therefore, it remains an effective method of insect control and does not lose its potency over time.

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