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Why Fleas Surge in the Fall

The "dog days" of summer are almost behind us, but that doesn't mean your pets can get by without flea protection. In fact, in most areas, fall is the worst season for fleas. Dr. Michael Dryden, professor of Veterinary Parasitology in the Department of Diagnostic Medicine and Pathobiology at Kansas State University College of Veterinary Medicine, Manhattan, calls it "the fall flea surge."

Dryden discovered that the number of fleas on animals in the fall were 70 percent higher than in the spring! He theorized that the "flea surge" occurs because in the fall there is generally an increase in precipitation and the temperatures stay around 70 degrees. Fleas thrive in these conditions. In fact, in the fall, pet owners tend to believe that their flea prevention program isn't working because the fleas are so abundant!


Fleas reproduce very efficiently. They start feeding on the blood of your pet within fifteen minutes upon their arrival and within 24 hours, they begin to breed. Each female flea will lay approximately 28-50 eggs per day.

The eggs are sticky at first but after a short time, they dry and fall off your pet into the environment and can hatch within 2-5 days. While it's possible to bring a flea into our environment on our clothing, unprotected pets are most likely the ones that deliver them—several at a time. "This is another reminder that cats that go outdoors at all also require protection," Dryden notes.

It is also important to remember in order to effectively eliminate fleas, you must treat the environment as well as the pet. This includes the carpet, furniture, beds and yards. Dryden also notes that home infestations occurring in the fall may exceed those in spring. Flea eggs that have fallen off the pet eventually hatch into larvae. Since larvae do not like light, they burrow down into the carpet or into fabric fibers where they remain for the next 7-14 days, preparing to become pupae.

Pupae are protected by a cocoon that the larvae spin, and they remain dormant until the conditions are right for the adult flea to emerge. The hatch can be stimulated by vibration such as vacuuming, walking or running, changes in light, carbon dioxide or the ideal temperature. Temperatures above 85 degrees encourage the dormant state, but when the temperature hovers around 70 degrees, fleas will begin hatching in very large numbers. They can live in a warm house all year round.

In the fall, pets begin getting their winter coats making them ideal homes for fleas to feed and breed. The thicker coat also makes it more difficult to groom fleas off.

For tips on how to treat your pet, home and environment, read Three Step Flea Prevention Plan.

If you need help, call us at 1-800-786-4751.

-Dr. B
Don Bramlage, DVM, Director of Veterinary Services at Revival Animal Health

The materials, information and answers provided through this website are not intended to replace the medical advice or services of your personal veterinarian or other pet health care professional. Consult your own veterinarian for answers to specific medical questions, including diagnosis, treatment, therapy or medical attention.

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