Tick Season in Missouri: Timing, Species, Diseases, and How to Protect Your Family

Missouri is one of the most tick-active states in the country — and if you spend any time outdoors here, that’s something worth taking seriously. One dermatologist in Rolla, Missouri has described the state as “the tick bite capital of the nation.” That’s not meant to alarm you, but it is a strong reason to stay informed.

Whether you’re hiking the Ozarks, working in the yard, or letting your dog run through tall grass, ticks can find you in nearly every season. Tick season in Missouri generally spans from early spring through late fall, and adult-stage blacklegged ticks can even be active on warm winter days. Knowing when they’re out, which species to watch for, and what to do if you find one can make a real difference for your health and your family’s safety.

Key Insight: Not every tick bite leads to illness, but the risk is real and growing. Tick-borne diseases are increasing as Missouri’s climate becomes wetter and warmer, and the tick season is getting longer and more severe according to researchers.

When Is Tick Season in Missouri

Ticks are most reliably active from April through September in Missouri, but the full picture is more nuanced than that. Tick season runs from early spring to early winter, and mild weather can keep them active well outside those core months.

Many people think ticks are most active during summer, but fall is actually prime time for ticks — deer are primary hosts, and fall is when deer move due to mating season and to find vegetation to build fat reserves for winter. This increased deer movement brings ticks into areas where people and pets are more likely to encounter them.

Researchers have noted that “the seasons are extending on both sides” — you can expect ticks to be active all the way through Thanksgiving, and they are also becoming active much sooner in spring. People are reporting finding ticks earlier in the spring months in Missouri than in previous years, which aligns with broader climate trends.

Important Note: Ticks can be active anytime the ground is not frozen, so even a warm January day can bring them out. Don’t assume you’re safe just because it’s technically winter.

Peak risk for tick-borne illness falls in late spring and early summer. At least six different types of tick-borne diseases have been reported in Missouri residents, and the majority of cases occur in May, June, and July. With warm and wet weather, tick season is here, and the number of ticks will increase until a peak in late June to early July.

Types of Ticks Found in Missouri

Three species of hard ticks are commonly encountered in Missouri: the Lone Star tick (Amblyomma americanum), the American dog tick (Dermacentor variabilis), and the deer tick or blacklegged tick (Ixodes scapularis). Each has distinct habits, preferred habitats, and disease risks you should know about. To understand more about how ticks reproduce and why populations can grow so quickly, it helps to understand their life cycle.

Lone Star Tick: The lone star tick is one of the most common ticks in Missouri and one of the most likely to bite humans. All life stages of this tick are aggressive biters and are known to frequently target humans, making them a significant concern for people and pets active outdoors. These ticks have long, visible mouthparts, which means lone star tick bites tend to go deep and lead to infection more often than the bites of other ticks.

American Dog Tick: Newly hatched larvae are yellow. Adults have an ornate brown-and-white mottling on the dorsal side, and blood-engorged females turn gray. Despite the name, this tick readily bites people. The American dog tick has an oval body and eight legs, with males significantly smaller than females. Most bites on humans come from the female.

Deer Tick (Blacklegged Tick): Also known as the black-legged tick, adult deer ticks feed primarily on white-tailed deer. They are responsible for more bites than any other tick species in Missouri, and their bite can transmit serious bacterial infections. Though less common in Missouri than in northeastern states, this tick is a major carrier of Lyme disease and is found in wooded areas.

Brown Dog Tick: Unlike other species, the brown dog tick lives mainly indoors. You don’t have to worry about encountering it outside — as its name suggests, it feeds mainly on dogs and occasionally cats, and its bites can transmit several canine diseases. It is also a vector for Rocky Mountain spotted fever.

Pro Tip: Adult ticks may look like a new freckle or a seed, but larval and nymph-aged ticks are tiny — many no bigger than a sesame seed. Their small size doesn’t mean they can’t bite humans. Always check carefully after outdoor time.

Tick-Borne Diseases in Missouri

At least six different human tick-borne diseases have been reported in Missouri: Rocky Mountain spotted fever, ehrlichiosis, tularemia, Q-fever, Lyme or a Lyme-like disease, and Southern tick-associated rash illness (STARI). Newer threats like the Heartland and Bourbon viruses have also emerged in recent years.

Tick-borne diseases are a type of emerging disease, many of them first recognized in the last 30 years. Human case numbers per year are generally on the rise — an upward trend due to better recognition and disease reporting, but also a reflection of environmental changes that foster increased exposure and transmission to humans.

Here’s a closer look at the most significant diseases in Missouri:

• Ehrlichiosis: Missouri has the highest prevalence in the U.S. of ehrlichiosis, a tick-borne bacterial disease. The lone star tick is the primary vector of ehrlichiosis in the United States. Symptoms typically include fever, headache, muscle aches, and fatigue, appearing within one to two weeks of a bite.
• Rocky Mountain Spotted Fever (RMSF): RMSF can be deadly if not treated with antibiotics within five days of the first symptoms. Five states — including Missouri — are responsible for over 60% of RMSF cases nationwide. Children ages 5 to 9 are at the highest risk group by age for Rocky Mountain spotted fever.
• Alpha-Gal Syndrome: The lone star tick is the main culprit of alpha-gal syndrome, a disease that causes an allergic reaction to eating red meat. When a tick bites you, it can put a tiny molecule called alpha-gal into your body, and some people’s immune systems react by making antibodies.
• Heartland Virus: The lone star tick can spread Heartland disease, first found in Missouri in 2009. It causes flu-like symptoms and can be severe in older adults or those with weakened immune systems.
• Bourbon Virus: Lone Star ticks can also carry the Bourbon virus. Missouri residents have tested positive for this virus, which includes symptoms such as diarrhea, muscle aches, and fever, and in extreme cases it can cause death.
• Tularemia: Tularemia is uncommon in the United States, but 40% of all tularemia cases are reported in Missouri, Oklahoma, and Arkansas. Dog ticks and wood ticks are the primary vectors.
• Lyme Disease: Though less common in Missouri than in northeastern states, the deer tick is a major carrier of Lyme disease. You can learn more about tick-borne encephalitis and other serious neurological complications that can arise from tick bites.

Important Note: A tick bite is a good indication to watch for disease, but it’s not always the first symptom. Some studies quote up to 60% of people with a proven tick-borne disease don’t recall the tick bite, because the majority of tick bites go unnoticed due to anesthetics in tick saliva.

High-Risk Areas and Habitats in Missouri

In Missouri, where dense forests, grassy fields, and humid summers create ideal tick habitats, understanding the risks and taking preventive measures is critical for residents and their pets. Ticks are not randomly distributed across the landscape — they concentrate in specific environments.

Ticks forage using a strategy known as questing. They climb to the top of tall grass and wait for a mammal or a person to pass by, and they are most common in high animal traffic areas, including along the edges of hiking trails. Ticks are much more likely to die from heat and sun exposure than cold temperatures, making open fields — even with long grasses — relatively inhospitable to them. They prefer shaded, moist environments.

High-risk areas in Missouri include:

• Ozark forests and hiking trails: The Ozarks are prime habitat, with dense canopy cover, abundant deer, and moist leaf litter providing ideal conditions for all three common tick species.
• Wooded backyards and brushy edges: During hot, dry conditions, ticks seek refuge in leaf litter, tall grass, and other protected areas, which allows them to survive until conditions become more favorable.
• Rural and agricultural areas: A low human population density, a high white-tailed deer density, and greater proportions of deciduous forest cover are all positively correlated with elevated incidence of ehrlichiosis in Missouri.
• Areas near deer populations: Ticks are reported more frequently during hunting seasons, as hunters are closer to deer. Deer populations are expanding in Missouri, and deer are described as “nurseries” for ticks — there can be thousands of ticks on a single deer. If you’re planning a dove hunting season in Missouri, be prepared for tick exposure in field and woodland environments.
• Suburban parks and greenways: Missouri’s larger cities and recreational areas are not immune to ticks either, making it important for residents and visitors alike to take precautions, especially during peak tick season.

Pro Tip: Walk in the center of trails to limit exposure, and avoid areas with tall grass and leaf litter. Staying on maintained paths significantly reduces your contact with questing ticks.

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

Prevention is your most effective tool against tick-borne illness. Individual personal protection is absolutely necessary to defend against tick-borne diseases. Reductions in tick populations through host and habitat management alone may not significantly reduce disease incidence unless combined with personal protection practices — because just one undetected bite from a single infected tick can cause a tick-borne disease.

Here’s how to protect yourself and your family:

1. Dress strategically: Wear long-sleeve shirts and long pants before entering wooded or grassy areas, and tuck your shirt into your pants. Wear light-colored clothing to easily spot ticks. Light colors also make it easier to see ticks before they attach.
2. Use repellents: Use an insect repellent with a minimum of 20% DEET, picaridin, or IR3535 on exposed skin and clothing. Other companies offer permethrin-based repellents, but be sure to apply this kind only to your clothes and not directly to your skin.
3. Stay on the trail: When hiking in wooded areas, walk in the center of trails to avoid brushing against overhanging brush and tall grass. A questing tick will perch itself with front legs extended on the stems of grass, low brush, or on the edges of leaves on the ground.
4. Do a full-body tick check: When checking for ticks, pay special attention to your underarms, ears, belly button, behind knees, between legs, waist, hairline, and scalp. Prompt removal after being in areas of suspected tick activity is the best way to prevent infection — transmission of many diseases normally takes up to 24 hours of attachment and feeding.
5. Shower and wash clothing promptly: Perform a full-body tick check, shower within 2 hours, and dry clothes on high heat for 10 minutes to kill any ticks.

Protecting children: If your kids are outside for an extended period of time or around outdoor pets, check them at bath time that night. Be sure to inspect kids carefully, checking their heads and necks very carefully, as ticks often migrate upward on the body.

Protecting pets: Pets are particularly vulnerable to tick bites. Consult a vet about tick-preventative medication for your dog or cat, conduct thorough post-walk inspections especially on ears, under collars, and between toes, and consider keeping cats indoors during peak tick season. For more detailed guidance, see these tips for preventing tick-borne diseases in your dog. You might also want to learn about animals that eat ticks and how natural predators can help reduce tick populations in your yard.

Common Mistake: Don’t wait to feel a tick biting before you perform a tick check. Tick bites are usually painless. If you wait to feel a bite before checking for ticks, your risk of infection is considerably higher.

What to Do If You Find a Tick in Missouri

Finding a tick attached to your skin is understandably alarming, but staying calm and acting quickly is the right approach. If you find an attached tick, remove it promptly — the longer it is attached, the greater the risk of infection.

Follow these steps for safe removal:

1. Use tweezers to grab the tick as close to the skin’s surface as possible.
2. Pull straight up when removing the tick. Do not twist or jerk.
3. Do NOT use alcohol, matches, liquid soap, or petroleum jelly to remove a tick. These methods can cause the tick to release fluids into the bite site.
4. After removing, clean the area with rubbing alcohol or soap and water.
5. Save the tick in a sealed bag for possible identification if symptoms appear later.

Pro Tip: Grasp the tick as close to the skin as possible with forceps or a tick removal tool and remove with gentle, steady traction. This will help ensure that the tick’s mouthparts do not remain in the skin.

After removal, monitor yourself and your family members carefully. Monitor for symptoms like fatigue, fever, muscle aches, or rashes for 30 days after a tick bite. Symptoms of tick-borne diseases typically begin within two weeks of a bite by an infected tick and for most people include a sudden fever, body aches, and headache.

The signs and symptoms of tick-borne disease vary among individuals and differ according to the infecting agent. In general, consider consulting a health care provider whenever you experience a sudden high fever, severe headache, muscle or joint aches, nausea, vomiting, or diarrhea — especially if these symptoms occur following a tick bite or after exposure to a tick habitat.

If the tick bite itself starts to have a ring around the site that appears like a bullseye, see a doctor promptly, as this can be a sign of Lyme disease. The majority of Missouri’s tick-borne illnesses can be successfully treated if they are caught early, but sometimes they are deadly.

Reporting Tick Bites and Tick-Borne Illness in Missouri

Reporting your experience with tick bites and tick-borne illness isn’t just about your own care — it’s an important part of protecting public health across Missouri. Most tick-borne diseases, such as Rocky Mountain spotted fever, ehrlichiosis, tularemia, and Lyme or a Lyme-like disease, are reportable in Missouri. Reporting helps DHSS monitor disease trends, track unusual occurrences or clusters of diseases, and identify possible risk factors associated with diseases.

Here’s how reporting works and what you should do:

• Tell your doctor: An ill person should report any tick bites, removals, or exposure to a tick habitat immediately to their healthcare provider. Be specific about when and where the bite occurred.
• Physician reporting to DHSS: Local public health agencies and/or DHSS are notified by physicians, laboratories, and other reporters when diseases listed in Missouri’s reporting regulations are confirmed or suspected. DHSS, in turn, reports cases to the CDC.
• Contact DHSS directly: You can reach the Missouri Department of Health and Senior Services Bureau of Communicable Disease Control and Prevention at health.mo.gov or by calling 573-751-6113 for information and resources.
• Use the Missouri Tick Awareness Toolkit: The DHSS toolkit includes fact sheets, Facebook ads, and other useful free materials that can help your community learn how to avoid tick bites, use repellent, do tick checks, recognize symptoms of tick-borne illnesses, and know when to seek care from a medical professional.

Key Insight: The number of tick-borne illnesses in Missouri is on the rise — just like much of the country — but this could also be due to doctors’ growing awareness of tick-borne illnesses and the availability of better testing. Early reporting and diagnosis make a significant difference in outcomes.

Missouri’s tick season is long, active, and carries real health risks — but awareness and preparation go a long way. By knowing when ticks are most active, recognizing the species in your area, and following consistent prevention habits, you can safely enjoy everything Missouri’s outdoors has to offer. Check yourself, your children, and your pets every time you come in from outside, and don’t hesitate to contact a healthcare provider if you have any concerns after a bite.

This information is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before making health decisions or if you suspect a tick-borne illness.