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What Kills Fleas Outside?

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Fleas are more than just a nuisance – they can cause serious health problems for your pets and even infest your home if left unchecked. If you’re dealing with a flea problem outdoors, you’ll want to know how to eliminate these pests effectively. Here’s everything you need to know about what kills fleas outside, how to protect your pets, and what preventative measures you can take to avoid a flea infestation.


Fleas outside can be effectively killed by regular lawn maintenance, application of diatomaceous earth, spraying environmentally friendly insecticides, spreading cedar mulch, introducing nematodes, and even flooding the yard. Commercial products like Talstar PL Granules and Vet’s Best Flea and Tick Yard Spray can also be used. Natural remedies include homemade sprays from cedar oil and water, diatomaceous earth, and citrus-based sprays. Regularly checking and treating pets for fleas is also essential.

Understanding Fleas

Fleas are tiny, flightless insects that feed on the blood of mammals and birds. They thrive in warm, humid environments and can lay up to 50 eggs a day. This means a few fleas can quickly turn into a full-blown infestation if not addressed promptly.

Effective Methods to Kill Fleas Outside

There are several ways to kill fleas outside, each with varying degrees of effectiveness. Here are some of the most effective methods:

Regular Lawn Maintenance

Mowing your lawn regularly and removing excess water can make your yard less inviting to fleas. This is because fleas prefer long grass and humid environments.

Diatomaceous Earth

This is a natural powder that kills fleas by damaging their exoskeletons. Simply spread a thin coat of diatomaceous earth all over your lawn to help control flea populations.


Spray your yard with environmentally friendly insecticides to kill fleas. These products work by disrupting the flea’s life cycle, preventing them from reproducing and killing them off over time.

Cedar Mulch

Spreading cedar mulch in your yard can also help repel fleas because they dislike the scent of cedar.


These are beneficial insects that can help control flea populations by feeding on their larvae. You can purchase nematodes from a garden supply store and introduce them to your yard to help control fleas.


Believe it or not, flooding your yard with water can help drown fleas and their eggs. This is a great method to use if you have a severe infestation.

Commercial Products for Flea Control

There are also several commercial products available for outdoor flea control. These include Talstar PL Granules, Cutter Backyard Flea Control Spray, Ortho Home Defense Insect Killer for Lawns, Vet’s Best Flea and Tick Yard Spray, and Black Flag Flea and Tick Killer, among others. These products are effective at controlling flea populations and preventing infestations in your yard.

Natural Remedies for Flea Control

If you prefer a more natural approach, there are several remedies you can try. These include using a homemade flea and tick killer spray made from cedar oil and water, spreading diatomaceous earth in your yard, or even using a citrus-based spray. While these methods may not be as effective as chemical treatments, they can still help control flea populations.

Preventative Measures

Prevention is always better than cure. To limit flea infestations outdoors, you can take several preventative measures such as regularly mowing your lawn, avoiding over-watering, treating dog runs with insecticides, keeping rodents and animals away from your home, and maintaining your yard.

Protecting Your Pets

Finally, don’t forget about protecting your pets. Regularly check your pet’s coat for fleas, use flea and tick preventatives on your pet year-round, limit the amount of time your pet spends outdoors, and bathe and brush your pet regularly.

In conclusion, while fleas can be a nuisance, there are several effective methods and products you can use to kill and control them outdoors. With a bit of effort and regular maintenance, you can keep your yard flea-free and protect your pets and home from these pesky pests.

Frequently Asked Questions

How often should I mow my lawn to deter fleas?

Mowing frequency can vary depending on the growth rate of your grass, but generally, it’s recommended to mow your lawn once a week during peak growth periods. This can help deter fleas by removing their preferred habitat.

How do I apply diatomaceous earth to my yard?

Diatomaceous earth can be applied by spreading a thin layer across your yard, focusing on areas where fleas are likely to inhabit such as shady spots, pet resting areas, and near structures. Always wear a mask when applying to avoid inhalation.

How safe are insecticides for pets and children?

Many insecticides are safe for pets and children once they’ve dried, but it’s important to always follow the manufacturer’s instructions. Keep pets and children away from the treated area until it’s completely dry.

How often should I flood my yard to kill fleas?

Flooding your yard can be an effective method to kill fleas, but it should not be done too frequently as it can damage your lawn and plants. You can flood your yard once or twice a year if you have a severe infestation.

How effective are natural remedies for flea control?

Natural remedies can be effective at controlling fleas, but they may not be as potent as chemical treatments. They are best used as a preventive measure or in conjunction with other methods for optimal results.

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