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When is Flea Season: Map by State

Medically Reviewed by

Tracy Isenberg, LVT

Fleas and ticks are a few of the many pests that can wreak havoc on your pets and household. So when is flea & tick season and where are they the biggest threat to both you and your beloved dog or cat?

Explore this article to find out:

  • When fleas are the largest threat in your state
  • What are fleas and ticks and where do they live
  • How to prepare and protect your pet from unwanted diseases
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Are fleas and ticks seasonal

Fleas and ticks have impeccable fighting power. Even in colder months, they will do anything to stay alive. While these pesky parasites tend to increase as temperatures rise, they aren’t completely seasonal.

What time of year are fleas most active

Temperature and humidity play a big role in creating the perfect climate for fleas and ticks. The ideal temperature ranges from 75° to 85° F and around 90% humidity. Both thrive in warmer climates and fleas are particularly favorable to humid conditions.

Fleas are most active in the early spring, summer, and fall. Adult fleas may have a hard time surviving harsh winters. But flea eggs, flea pupae, and larvae can survive all year. Common hiding spots include your attic, floorboards, and furniture.

So when do you need to worry about protecting your pets? Here’s what you need to know about the seasonality of parasites in your area.

When is flea season#

Flea season can last anywhere from 6-9 months to all year round in some states. Fleas love warm temperatures, so your season can start early in spring and last until September, October, or November.

What months do fleas and ticks thrive

In the United States, they are prevalent all year long in warmer climates. Besides the winter months, the most common include:

  • March
  • April
  • May
  • June
  • July
  • August
  • September

Flea & tick season map by state

flea and tick season by state

Source: American Kennel Club, 2023

When does flea & tick season start in each state

Year-roundAlabama, Arizona, California, Georgia, Florida, Hawaii, Louisiana, Mississippi, Nevada, North Carolina, Oregon, South Carolina, Texas, Washington
MarchDelaware, Idaho, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, New Mexico, Ohio, Oklahoma, Pennsylvania, Tennessee, Utah, Virginia, West Virginia
AprilColorado, Connecticut, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, Nebraska, New Hampshire, New Jersey, New York, Rhode Island, South Dakota, Vermont, Wisconsin
MayAlaska, North Dakota, Wyoming

When is flea & tick season over in each state

Year-roundAlabama, Arizona, California, Georgia, Florida, Hawaii, Louisiana, Mississippi, Nevada, North Carolina, Oregon, South Carolina, Texas, Washington
NovemberIowa, Maine, Michigan, Minnesota, Montana, Nebraska, New Hampshire, North Dakota, South Dakota, Vermont, Wyoming
DecemberArkansas, Colorado, Connecticut, Delaware, Idaho, Illinois, Indiana, Kansas, Kentucky, Maryland, Massachusetts, Missouri, New Jersey, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Utah, Virginia, West Virginia, Wyoming


Flea Season in California

California is a vast area that spans the entire west coast. This geography makes for a variety of climates and temperatures depending on where you live.

While most of California is warm and dry, there are some areas that are far more humid and wet. Mild temperatures make California the perfect home for fleas, ticks, mosquitoes, and more.


Flea and Tick Season in Florida

If you’ve ever visited Florida you know how humid it can be no matter the time of year. Florida is part of the humid subtropical climate zone which makes for long, hot summers and mild, wet winters. Because of this, fleas and ticks can be big issues for your pets year-round.

New York

Flea and Tick Season in New York

New York is part of the humid continental climate zone. Bordered by several large bodies of water, New York has warm summers and cold winters. Large urban areas also make it easier for your dog to host fleas even as temperatures drop. These are ideal conditions for fleas to survive cold weather.

Large urban areas also make it easier for your dog to host fleas even as it gets colder. These are ideal conditions for fleas to survive cold weather.

Michigan and Ohio

Tick and Flea Season in Michigan and Ohio

Unlike other midwestern states, Michigan and Ohio get hit a little harder by pests. This is due to large bodies of water and tall grasses nearby. Both states are part of the humid continental zones and experience mild to hot summers with rain all year.


Flea and Tick in Pennsylvania

Like much of the northeastern United States, Pennsylvania falls in the humid continental climate zone. Similar to New York, this area suffers from hot, wet summers and tons of rain. Mild, damp conditions are great for fleas, ticks, and mosquitoes..


Tick and Flea Season in Texas

Texas’ size ensures there are several climate zones represented throughout. Hot semi-arid climates are prevalent along the border of Mexico. And in the eastern part of the state, you might experience humid subtropical climates. Either way fleas and ticks are a year-round threat to your pets.

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What are ticks and where to find them

There are over 200 types of ticks in the United States. Ticks transmit diseases (like Lyme disease) when they feed on the blood of animals like dogs, cats, and rodents. Most species of ticks live east of the Rocky Mountains.

Common types of ticks in the United States

Tick speciesTick-borne diseases
American dog tickEhrlichiosis, Rocky Mountain spotted fever, Tularemia
Blacklegged tickLyme disease, Babesiosis, Anaplasmosis
Brown dog tickRocky Mountain spotted fever
Lone star tickEhrlichiosis
common types of ticks

But, even if you live on the West Coast you aren’t entirely out of the woods. Ticks can be an even bigger problem if you live in more rural areas (i.e. tick-infested regions). Hiking in tall grass and wooded areas are other ways you can encounter ticks.

What are fleas and where to find them

Finding fleas on dogs or cats isn’t fun. They are easy to pick up from places like the dog park or kennel. And, they can become an even bigger issue if they remain active in your home.

Common types of fleas in the United States

Flea speciesFlea-borne illnesses
Cat fleasCat scratch disease (CSD), Murine typhus
Dog fleasTapeworm
Ground squirrel fleaBubonic plague
Oriental rat fleasBubonic plague, Murine typhus
types of fleas

Fleas are extremely common in indoor or outdoor cats and dogs, and they live all over the world. Fleas tend to find an animal host (like your pets) to feed on and reproduce. Their itchy bites can cause hair loss, bacterial infection, and disease.

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How to prepare your pet for fleas and ticks

By now you know that these disease-ridden parasites are a nuisance every year. But do dogs need flea and tick prevention in the winter? What about cats? How can your veterinarian help you and your pet?

No matter where you live, it’s best to use preventive medication to avoid tick bites or an active flea infestation. Even in the winter months, continuous treatments can be helpful for year-round flea prevention for your pet. The best strategy is to at least start in your state’s peak month.

Here are some other ways you can prepare for the warmer months ahead.

Learn where to check your pet for pests

There are common areas where parasites like to nest on your pet. Know the signs of fleas and where to look for ticks.

Understand how to remove ticks on dogs

There are lots of myths about tick removal. Be sure you know the right way to remove them from your pet and what tools you need (like a flea comb).

Know how to treat flea eggs and fleas found on pets

Just like tick removal, there's a lot of misinformation about getting rid of a flea infestation. Do your research and make sure you're taking care of every life stage on your dog or cat.

Clean and safeguard your house

Infestations don't stop at your pet. They can also infest your home. In the spring and summer, keep the grass short to discourage bugs in your yard. Use a household spray with an insect growth regulator (IGR) to protect against future flea infestations.

Consult with your veterinarian

Not every dog or cat responds the same to preventative medication. Check with your vet if you're unsure of the right flea treatment for your pet.

Monitor your pet's health

Keep up with your pet's vaccination schedule and nutrition. If your dog or cat exhibits new or odd behavior, contact your vet for a check-up. They can assess their diet and overall health to determine if a supplement is right for them.

Protect your pet year-round

The right preventative flea and tick treatment will kill ticks and fleas. This includes all life cycle stages (eggs, larvae, and adults).

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