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How to Kill Fleas in My Yard

By Greg Lindberg ; Updated September 21, 2017

If you have pets and notice fleas in your home, then most likely there are fleas living in your yard. It’s important keep fleas off of your pets and eliminate them from your home, as they can carry worms and diseases. Once you’ve killed any fleas that are on your pet or in your home, you should inspect your yard for any infestations of fleas. Once you’ve removed the fleas from your yard, you should still take preventative methods such as using a flea control for your pets in case fleas return.

Locate the area in your yard that you think the fleas are infesting. Fleas live in areas of shade, such as in weeds, under porches, within bundles of wood and places where your pet may often lay down. If the infestation is large, you will easily see several fleas bouncing around--and where there are a few there are usually many close by.

Purchase a flea-killing chemical that is safe for outdoor pets, like silica aerogels, boric acid and diatomaceous earth. These chemicals often slowly kill the fleas and demobilize them. Apply such pet-safe chemicals by spraying the liquid or shaking the powder over the flea-infested areas and non-infested areas of your yard as instructed on the label.

Allow for the chemical to set in the areas you sprayed for up to two to three days, when the fleas should then be dead. You shouldn't need to reapply the chemical if it rains since it makes contact with the fleas quickly. Monitor your pets during this time and check them for fleas. Give your pets a bath using flea shampoo, if necessary.

Apply a product containing nematodes as directed. Nematodes are small, nontoxic bugs that eat fleas, and they are contained inside pump sprayers that can be sprayed over the areas where fleas are. Nematodes sprayers can be found at many home and garden stores.

Purchase an insecticide that contains chlorpyrifos if any flea infestations still occur in your yard. This is a stronger chemical that will kill the fleas directly upon contact. Apply as directed on the label and keep children and pets away from the areas you spray as long as possible since this is an extremely toxic chemical. This amount of time varies for different insecticides, but is often no longer than 24 hours.


Things You Will Need

  • Gardening gloves
  • Nontoxic flea killer
  • Flea shampoo (optional)
  • Nematodes sprayer
  • Chlorpyrifos insecticide


  • Make sure to wear protective gloves and clothing when looking for and killing the fleas.