Maine Tick Season Guide: Active Months, High-Risk Areas, and How to Stay Protected

Maine’s tick problem is no longer just a springtime concern — it has quietly grown into a year-round public health challenge that every resident and visitor needs to understand. The rate of Lyme disease in Maine has increased more than tenfold in the past 20 years, and it continues to rise. Whether you enjoy hiking the trails of Acadia, gardening in your backyard, or simply walking the dog, knowing when ticks are active, where they hide, and how to respond can make a meaningful difference for your health and your family’s well-being.

This guide walks you through everything you need to know about tick season in Maine — from peak activity windows and common species to disease risks, high-exposure habitats, and clear steps for protection and response.

Key Insight: Ticks remain active throughout the fall, with cases of tick-borne diseases in Maine continuing to climb — and current-year case counts are on track to break tick-borne disease records.

When Is Tick Season in Maine

According to the University of Maine, tick season in the state runs from early spring to late fall, with two distinct peaks — the first from April to May and the second from June to early July. However, thinking of tick exposure as a seasonal issue can give you a false sense of security.

Although most ticks are found during these peak months, it is important to note that ticks can remain active as long as the temperature does not drop below freezing. In fact, whenever the temperature rises above 40 degrees Fahrenheit, there’s a chance you could come across active ticks.

Adult deer ticks are active in the fall from late September through late November, and they can also emerge during winter whenever temperatures are above freezing. This extended window has become increasingly relevant in recent years.

Important Note: The habitat range for ticks has grown and will likely continue to expand as winters become warmer and shorter. Deer ticks may be active any time temperatures are above freezing, and experts say people should continue to take precautions even in winter, because ticks are now a year-round problem.

Here is a quick overview of tick activity in Maine by season:

Season	Months	Tick Activity Level	Primary Risk
Early Spring	March – April	Moderate (rising)	Adult deer ticks emerge
Late Spring / Early Summer	May – June	Very High (Peak)	Nymph deer ticks; American dog ticks
Summer	July – August	High	Nymph ticks; Lyme disease transmission risk
Fall	September – November	High (second peak)	Adult deer ticks re-emerge
Winter	December – February	Low but possible	Active on warm days above freezing

According to the Maine Medical Center Research Institute, about two-thirds of the cases of Lyme disease in Maine are reported in June, July, and August — because the peak season for deer tick nymphs is June and July. All life stages will bite humans, but because the nymphs are tiny and their bites painless, they often go unnoticed.

Types of Ticks Found in Maine

About 14 different tick species live in Maine, but not all of them bite people. The most common ticks seen in Maine are the deer tick (Ixodes scapularis), American dog tick (Dermacentor variabilis), and the woodchuck tick (Ixodes cookei). Understanding the differences between these species can help you assess your risk level after outdoor exposure.

Understanding how ticks reproduce can also help you appreciate why populations grow so quickly and why early-season vigilance matters so much.

Deer Tick (Blacklegged Tick)

The blacklegged tick, commonly known as the deer tick, is prevalent throughout Maine, but especially in southern and coastal areas. These ticks are notorious vectors of Lyme disease, anaplasmosis, babesiosis, and Powassan virus, making them a significant concern for public health.

Adults are active from early spring to late fall, peaking in April/May and October/November, while nymphs peak in June and July. This tick’s life cycle requires at least two years for completion. Following its first appearance in southern Maine in the 1980s, this tick has advanced along the coast and then inland, and may now occasionally be encountered in northern Maine.

American Dog Tick

The American dog tick is common across Maine, particularly in the southwestern region. Known for their resilience in drier habitats such as open fields and lawns, these ticks are active from April to August, with their peak in May and June.

The American dog tick is not a vector of Lyme disease. This tick is particularly abundant in southwestern Maine, but its range has been expanding in recent years. Immature stages feed on voles and other small rodents, but adults are often found on humans, dogs, and other domestic animals. Adults are found from May through July but rarely later in the season.

Woodchuck Tick (Squirrel Tick)

The woodchuck tick (Ixodes cookei) can transmit Powassan virus. It has not been associated with Lyme disease but is a vector of Powassan virus. It will only occasionally bite humans, and it can be found throughout much of Maine, but is primarily found within the nests of its hosts. It is also frequently found in abandoned or seasonal buildings where squirrels have taken up residence.

Brown Dog Tick

The brown dog tick, or kennel tick, thrives in environments associated with dogs, such as kennels. Rare in nature in Maine, these ticks are more commonly encountered indoors and can complete their entire life cycle within human homes. They primarily transmit diseases to dogs, including canine ehrlichiosis and babesiosis.

Pro Tip: After any outdoor activity, always do a full-body tick check on yourself, your children, and your pets. Nymph deer ticks are roughly the size of a poppy seed — easy to miss on skin and fur alike.

Tick-Borne Diseases in Maine

Tick-borne diseases have rapidly become a significant public health issue in Maine and throughout much of the United States. The incidence and distribution of these pathogens continues to increase. Of the multiple tick-borne diseases found in the U.S., five are known to occur in Maine: Lyme disease, anaplasmosis, babesiosis, Borrelia miyamotoi disease, and Powassan encephalitis — all of which can be transmitted by the deer tick.

Lyme Disease

Lyme disease is an infectious, inflammatory disease caused by the bacteria Borrelia burgdorferi. In 70–80% of infected individuals, a rash expanding from the tick bite and exceeding two inches in diameter will appear within a few days to three weeks after the bite. As the rash expands, it may develop paler bands, giving it a “target” appearance.

The initial symptoms of Lyme disease are fatigue, malaise, muscle aches and pains, headache, chills, and fever. Untreated, additional symptoms may occur including hot swollen joints, paralysis of one side of the face (Bell’s palsy), and shooting pains caused by disturbances in cardiac rhythm.

There were 3,218 reported cases of Lyme disease in Maine in 2024, nearly 300 more than in 2023. Maine consistently ranks among the country’s highest states in Lyme disease transmission, and it is estimated that up to 20% of Lyme cases may become chronic, with symptoms lingering for months or even years.

Anaplasmosis

Anaplasmosis is caused by the bacteria Anaplasma phagocytophilum. Though less commonly reported than Lyme disease, the number of reported cases has been increasing over the past twenty years — a trend especially pronounced in Maine, with cases nearly doubling annually from 2012 through 2017. Anaplasmosis is transmitted through the bite of an infected deer tick.

First symptoms occur within a few days of the tick bite and include chills, fever, headache, malaise, nausea, cough, and confusion. Lyme-typical rashes, inflamed joints, or neurological problems are not part of the symptom complex. There were 1,284 reported cases of anaplasmosis in Maine in 2024, a 65% increase from the year before.

Babesiosis

Babesiosis is caused by a protozoan parasite (Babesia microti) that infects red blood cells, potentially causing hemolytic anemia in infected patients. Signs of babesiosis range from no symptoms to serious disease. Common symptoms include extreme fatigue, aches, fever, chills, sweating, body aches, dark urine, and anemia.

In some patients, particularly those who have had their spleens removed, are immunocompromised, or are elderly, the disease can become rapidly fatal. There were 309 cases of babesiosis reported in Maine in 2024, a 59% increase from the year before.

Borrelia miyamotoi Disease

Borrelia miyamotoi is a spirochetal bacteria closely related to the Borrelia species that cause tick-borne relapsing fever. It was first identified and isolated from ticks in Japan in 1995 and has since been detected in deer ticks in the eastern United States. In Maine, cases have been reported since 2016, but have remained in the single digits. Unlike other tick-borne pathogens in Maine, Borrelia miyamotoi can be passed from mother to offspring through the eggs, making larval ticks a potentially important stage in the transmission cycle.

Powassan Encephalitis

Deer ticks are a vector for Powassan virus, a potentially deadly form of encephalitis. What makes Powassan particularly concerning is its transmission speed: Powassan virus transmission may take as little as 15 minutes of attachment. This is far shorter than the 24–36 hours typically associated with Lyme disease transmission, making prompt tick removal even more critical. You can learn more about tick-borne encephalitis and how it affects the nervous system.

Common Mistake: Many people assume that if a tick was attached for only a short time, there is no risk of disease. While Lyme disease typically requires 24+ hours of attachment, Powassan virus can transmit in as little as 15 minutes — so prompt removal always matters.

High-Risk Areas and Habitats in Maine

Maine’s dense forests, high grass, and abundant wildlife provide perfect habitats for ticks. But the risk is not evenly distributed across the state — some regions and microhabitats carry significantly higher exposure rates than others.

Geographic Hot Spots

In six years of operation, the University of Maine Cooperative Extension Tick Lab has tested more than 22,000 ticks from every corner of the state. They found ticks from Hancock, Knox, Lincoln, and Waldo counties are most likely to carry the pathogens that cause Lyme disease, anaplasmosis, and babesiosis. The Midcoast also has the most reported human cases of those illnesses and related hospitalizations.

Data from the Maine CDC show that the rate of tick-borne diseases is especially high among Mainers in the Midcoast. As explained by Griffin Dill of the University of Maine Cooperative Extension Tick Lab, “The deer tick is prone to drying out quite easily, so forested areas where it remains relatively humid — like it does along the coast — are really kind of perfect habitats for the ticks themselves.”

In contrast, pathogen prevalence is lowest in adult deer ticks from Maine’s northernmost counties: Aroostook (13.6%), Piscataquis (25.8%), and Washington (31.3%). That said, no county in Maine is entirely tick-free.

High-Risk Microhabitats

Habitat studies show that deer ticks are less associated with open fields and softwood forests and more associated with hardwood and mixed hardwood/softwood forests. They are especially associated with dense thickets of invasive plants, such as Japanese barberry or American bittersweet.

• Wooded edges and forest margins — transition zones between lawn and woods are prime tick territory
• Tall grass and brush — ticks stand on the ends of grass blades with their legs extended, ready to attach to whatever passes by
• Leaf litter — moist layers of fallen leaves retain humidity and shelter ticks
• Coastal and Midcoast areas — humid conditions near the shore support high tick survival rates
• Your own backyard — most Mainers sending diseased ticks to the state lab are finding them in their yards and gardens, not forests and fields

Animals that naturally prey on ticks can help reduce tick populations in certain environments. Learning about animals that eat ticks provides helpful context for understanding the natural checks on tick populations in Maine’s ecosystems.

How to Protect Yourself, Children and Pets During Tick Season in Maine

Protecting yourself and your loved ones during tick season in Maine requires a layered approach. The Maine CDC has developed a helpful acronym — TICKS — to summarize the key steps:

1. T — Take and use an EPA-approved repellent. Use DEET, picaridin, IR3535, or oil of lemon eucalyptus on skin. Use permethrin on clothing only.
2. I — Inspect your whole body for ticks daily and after any outdoor activities. Check family members and pets too.
3. C — Cover your skin. Wear light-colored long-sleeve shirts and pants, and tuck pants into socks.
4. K — Know when you are in tick habitat. Take precautions in areas where ticks may live.
5. S — Shower when you get home. Showering helps remove crawling ticks. Put clothes in the dryer on high heat for 15 minutes before washing to kill any ticks in your clothes.

Protecting Children

Children are most susceptible because they tend to play outdoors the most, and people who spend time outdoors are at a higher risk. Reported cases of Lyme disease in Maine have a bimodal age distribution, indicating the highest risk in youth (ages 5 to 14) and adults over age 45.

• Apply EPA-approved repellent to children’s skin and clothing before outdoor play
• Dress children in light-colored clothing so ticks are easier to spot
• Perform a full-body tick check on children after any time spent outdoors — pay special attention to the scalp, behind the ears, armpits, groin, and behind the knees
• Teach older children to do their own tick checks as part of their outdoor routine

Protecting Pets

Pets let outdoors can pose a risk, as they are likely to carry ticks back into the home. Dogs and other outdoor pets can get tick bites and tick-borne diseases. Vaccines are not available for all tick-borne diseases that dogs or other animals can get, and vaccines do not prevent your animals from bringing ticks into your home.

• Use veterinarian-recommended tick prevention products year-round
• Look thoroughly around the eyes and ears, between front and back legs, between toes, around the tail, and around the neck and shoulders when checking pets for ticks
• Keep grass trimmed and brush cleared in areas where pets play

For more detailed guidance on keeping your dog safe, see these tips for preventing tick-borne diseases in your dog.

Yard and Property Tips

Reducing tick habitat around your home is one of the most effective long-term strategies. Ticks love shady, moist areas with tall grass, dense brush, and fallen leaves — all things many Maine yards naturally have. Here are practical steps to reduce tick exposure on your property:

• Keep your lawn mowed short and trim brush along walkways and fences
• Clear out leaf litter, especially around the edges of your property
• Stack firewood neatly in a dry area away from your home
• Use gravel or wood chips to create a barrier between wooded areas and your lawn
• Discourage wildlife traffic by securing trash bins and cleaning up fallen birdseed

Pro Tip: Light-colored clothing makes it much easier to spot ticks before they attach. After coming indoors, toss your clothes in the dryer on high heat for at least 15 minutes — the heat kills ticks more effectively than washing alone.

What to Do If You Find a Tick in Maine

Finding a tick on yourself, a child, or a pet can feel alarming, but staying calm and acting quickly is what matters most. If you find a tick, the sooner you remove it, the less likely you’ll get a tick-borne illness. Finding a tick on you, even if it was attached, does not necessarily mean that it spread any germs to you.

How to Remove a Tick Safely

1. Use fine-tipped tweezers. To remove an embedded tick, use fine-tipped tweezers. Grasp the tick as close to the skin’s surface as possible, then pull upward applying steady, even pressure.
2. Do not twist or jerk. Do not grab the tick’s body, as it could cause the tick to regurgitate into the wound and cause infection. Once grasped, pull the tick straight out in a careful but consistent motion — making sure not to twist or wiggle.
3. Handle mouthparts carefully. If the tick’s mouthparts break off and remain in the skin, use your tweezers to remove them.
4. Dispose of the tick properly. Ticks cannot easily be crushed, so consider flushing the tick down the toilet or drain. Alternatively, place it in a sealed bag or container — especially if you plan to submit it for testing.
5. Clean the bite area. Wash the bite area and your hands thoroughly with rubbing alcohol or soap and water.
6. Monitor for symptoms. If a rash develops within 30 days, or if the bite area begins to resemble a bullseye with reddish rings, consult a medical professional.

Important Note: Do not use petroleum jelly, nail polish, heat, or other folk remedies to remove a tick. These methods can cause the tick to release more fluids into the bite wound, potentially increasing your risk of infection.

After Tick Removal: Watch for Symptoms

The most common symptoms of tick-borne disease include body aches, chills, fever, headache, and swollen lymph nodes. People who have Lyme disease may also find an expanding rash somewhere on their body. This rash can sometimes look like a bullseye, but not always. If you experience any of these symptoms, talk to a healthcare provider.

Early symptoms of tick-borne diseases are usually vague — fatigue, fever, headache — and are easily mistaken for flu-like symptoms. Delays in diagnosing tick-borne illnesses allow the disease to progress, which can lead to more serious complications.

Submit Your Tick for Testing

The University of Maine Cooperative Extension Tick Lab offers tick identification for free and tick testing to Maine residents for a $20 fee. Testing can take up to three days and should be used for surveillance purposes only, not for diagnosis. You can find more information and submit a tick at ticks.umaine.edu.

Reporting Tick Bites and Tick-Borne Illness in Maine

Maine has high rates of tick-borne diseases. Lyme disease, anaplasmosis, and babesiosis are the most commonly reported tick-borne diseases in Maine. Tracking the spread of tick-borne diseases allows communities, state officials, and healthcare providers to prepare strategies to prevent the spread of these diseases.

How Reporting Works in Maine

Anaplasmosis, babesiosis, ehrlichiosis, hard tick relapsing fever, Lyme disease, Powassan virus disease, and spotted fever rickettsiosis are all notifiable by both medical practitioners and clinical laboratories in Maine. Reporting clinicians must submit subsequent clinical and laboratory information following the initial report. Maine CDC also monitors tick-borne diseases through syndromic surveillance.

If you experience symptoms after a tick bite, your healthcare provider is responsible for reporting confirmed or probable cases to the Maine CDC. Your role is to seek care promptly and provide your doctor with as much detail as possible — including when and where you may have been exposed.

What You Should Tell Your Doctor

• When and where the tick bite occurred (or when you may have been in tick habitat)
• How long the tick appeared to be attached, if known
• The tick species, if you were able to identify it or saved the tick
• Your symptoms and when they began
• Mention any recent tick exposure even if you are unsure whether a bite occurred

Maine Tick Surveillance Resources

Maine offers several tools to help residents stay informed and contribute to statewide tick monitoring:

Resource	What It Offers	Where to Find It
UMaine Extension Tick Lab	Free tick ID; $20 tick testing	extension.umaine.edu/ticks
Maine Tracking Network	Near real-time Lyme, anaplasmosis, and babesiosis case counts	data.mainepublichealth.gov
Maine CDC Ticks Page	Disease info, prevention guidance, reporting resources	maine.gov/dhhs

This data helps individuals educate residents about the need for early detection and treatment to prevent the progression to the debilitating late stage of these diseases. Staying informed about tick activity in your county and submitting ticks for testing when you find them contributes to the broader public health picture across Maine.

Key Insight: So far in 2025, case numbers of some human tick-borne illnesses have surpassed incidence rates of earlier years. Health care providers are reminded to consider testing patients presenting with possible tick-borne disease at any time of the year, including fall and winter when deer ticks are active.

Tick season in Maine demands steady, year-round awareness — not just a few weeks of caution in spring. By understanding when ticks are active, which species pose the greatest risk, and how to respond after a bite, you put yourself in the best position to enjoy Maine’s outdoors with confidence. Use the resources available through the University of Maine Extension Tick Lab and the Maine CDC, stay consistent with tick checks, and never hesitate to contact a healthcare provider if symptoms develop after outdoor exposure.