Minnesota is home to 13 known tick species, but two cause the vast majority of human encounters: the American dog tick (commonly called the wood tick) and the blacklegged tick (also known as the deer tick). The deer tick is the bigger concern because it transmits Lyme disease, the most common tickborne illness in both Minnesota and the entire United States. In 2022, Minnesota reported 2,685 probable Lyme disease cases alone. Knowing which ticks live here, when they’re active, and how to protect yourself makes a real difference in your risk.
The Two Ticks You’ll Actually Encounter
The American dog tick, or wood tick, is the one most Minnesotans recognize. Unfed adults are dark brown with whitish or yellowish markings. On females, those markings cover about half the body; on males, they cover nearly the entire body. These ticks are large enough to spot fairly easily, especially before they’ve fed. Wood ticks can transmit Rocky Mountain spotted fever and tularemia, but both diseases are extremely rare in Minnesota.
The blacklegged tick, or deer tick, is smaller and harder to notice. Adult females are reddish brown with a black head, black legs, and a small black plate behind the head. They lack the conspicuous markings of wood ticks. Deer ticks are responsible for transmitting Lyme disease, anaplasmosis, babesiosis, ehrlichiosis, Powassan virus, and hard tick relapsing fever. If you find a tick on yourself in Minnesota, identifying which of these two species it is tells you a lot about your actual risk.
One key detail for identification: adult females of both species are noticeably larger than males. Males have a hard plate covering most of their body, while females have a much smaller plate, which allows their bodies to expand dramatically when feeding. You may also encounter ticks in their earlier life stages. Larvae have six legs, while nymphs and adults have eight.
When Ticks Are Most Active
Tick season in Minnesota follows a predictable pattern tied to temperature and snow cover. Adult ticks typically emerge right after snowmelt and hit their peak spring activity during May. They stay active throughout June, then become less common during the hottest summer weeks. Activity picks up again in fall, usually from late September through October, until freezing temperatures arrive or snow covers the ground.
Nymphs, which are the immature ticks most likely to transmit Lyme disease because they’re tiny and easy to miss, follow a slightly different schedule. They start becoming active in mid-May and peak from late May through June. Larvae are most active in June. This means late May and June represent the highest-risk window, when adults, nymphs, and larvae are all active simultaneously.
Don’t assume winter means zero risk. On warm days with little or no snow cover, adult ticks can emerge and search for a host even in the middle of winter.
Diseases Carried by Minnesota Ticks
Lyme disease dominates the tickborne disease picture in Minnesota. It’s caused by bacteria transmitted through deer tick bites and produces a range of symptoms. The characteristic bull’s-eye rash is well known, but it doesn’t always appear. Among Lyme cases reported in low-incidence Minnesota counties in 2022, only 24% had a physician-diagnosed bull’s-eye rash. Symptoms that appeared without early treatment included joint swelling, facial nerve paralysis (Bell’s palsy), and heart conduction problems. Most cases had symptom onset between May and September, matching peak tick activity.
Anaplasmosis is the second most common tickborne disease in the state. It was first recognized in Minnesota in the early 1990s and is also transmitted by deer ticks. Symptoms typically include fever, headache, muscle aches, and fatigue, and they tend to appear one to two weeks after a bite.
Several less common but notable diseases round out the list. Babesiosis is a parasitic infection transmitted by deer ticks that occurs infrequently. Ehrlichiosis caused by a specific strain first reported in 2009 has so far been identified only in Minnesota and Wisconsin. Powassan virus, first reported in a Minnesota resident in 2008, has appeared nearly every year since and is particularly concerning because it can cause serious neurological illness and can be transmitted within minutes of a tick attaching, unlike Lyme disease, which generally requires a longer attachment period.
Hard tick relapsing fever, caused by a bacterium distantly related to the Lyme disease bacterium, has been reported in small numbers in the Upper Midwest. Rocky Mountain spotted fever and tularemia, both transmitted by American dog ticks, remain extremely rare in Minnesota.
Who Gets Sick and Where
Lyme disease in Minnesota skews slightly male: 57% of the 2,685 probable cases reported in 2022 were in men. The median age was 52, with cases ranging from age 1 to 96. The vast majority of cases, 93%, occurred in counties already considered high-incidence for tickborne diseases, concentrated in the central and northern forested regions of the state. But 7% of cases occurred in counties classified as low-incidence, meaning tick exposure can happen in parts of Minnesota where people might not expect it.
The Minnesota Department of Health is also monitoring the lone star tick, a species historically found in the southeastern United States that has been reported in several Minnesota counties. Lone star ticks are associated with alpha-gal syndrome, an allergic reaction to red meat that develops after certain tick bites. The state is actively tracking lone star tick distribution and assessing how many Minnesotans may be affected.
How to Protect Yourself
Prevention works on two levels: keeping ticks off your skin and killing or repelling them on contact with your clothing.
For clothing, the most effective option is treating your gear with 0.5% permethrin, an insecticide that kills ticks on contact. Spray both sides of your clothing for 30 to 45 seconds per area and let everything dry completely before wearing it or bringing it indoors. A single application lasts about six weeks or six washes. Permethrin is safe for people, including children and pregnant women, but it is toxic to cats. Never apply it directly to skin.
For exposed skin, DEET and picaridin are the most effective repellent options. DEET at 20% to 35% concentration works well for most outdoor activities. Concentrations above 30% aren’t more effective, they just last longer, with higher-concentration products protecting against ticks for up to eight hours. DEET at 10% to 30% is safe for children over 2 months old. Picaridin at 20% concentration provides 8 to 14 hours of tick protection and is also safe for children. Another option, IR3535, provides 9 to 11 hours of protection depending on formulation and is safe for infants and pregnant women.
Oil of lemon eucalyptus is a registered repellent but is less effective against ticks and shouldn’t be used on children under 3. Products that don’t work include citronella, botanical oils like cinnamon and peppermint, vitamin supplements, herbal remedies, and repellent bracelets.
Simple clothing choices also help. Wear light colors so you can spot ticks more easily. Wear long sleeves and long pants, and tuck your pants into your socks to block ticks from climbing up your legs. After spending time outdoors, do a thorough tick check. Pay attention to hidden areas: behind the ears, along the hairline, in the armpits, behind the knees, and around the waistband. Showering within two hours of coming indoors can help wash off unattached ticks and gives you a chance to check your whole body. Tossing your clothes in a hot dryer for 10 minutes kills any ticks that hitched a ride.
If You Find an Attached Tick
Use fine-tipped tweezers, grasp the tick as close to the skin surface as possible, and pull upward with steady, even pressure. Don’t twist, jerk, or squeeze the body. If mouth parts break off in the skin, try to remove them with tweezers, but if you can’t get them out easily, leave them alone and let the skin heal. Clean the bite area with rubbing alcohol or soap and water.
Skip the folk remedies. Coating the tick with nail polish, petroleum jelly, or heat from a match doesn’t make ticks detach and can actually increase your risk by causing the tick to regurgitate into the bite. The goal is to remove it quickly and cleanly. If you want the tick identified, the Minnesota Department of Health accepts ticks by mail and will tell you which species you found.