Are There Ticks in Illinois?
Yes, ticks are common throughout Illinois, particularly in wooded areas, grasslands, and parks across the state. American dog ticks and lone star ticks are the primary species found in Illinois. Tick-borne illnesses such as Lyme disease can result from tick bites, though most people who are bitten do not become infected.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
American Dog Tick · Nova Patch CC BY-SA
American Dog Tick · Matthew Lindsey CC BY
Asian Longhorned Tick · Zachary Dankowicz CC BY
- 6
- species recorded
- 7,929
- GBIF records
- May, April, June
- peak months
Yes, ticks are in Illinois. Next you'll want:
Verified species, source iNaturalist
4 types of ticks recorded in Illinois
4 tick species have a verified observation record in Illinois, each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
- No openly licensed photo yet1
- No openly licensed photo yet2
- No openly licensed photo yet3
- No openly licensed photo yet4
Plus 1 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations.
Real sighting data, source iNaturalist
2,504 verified observations on iNaturalist of tick have been recorded in Illinois, most often in May, April, June.
When tick are recorded in Illinois
Yes, ticks are common throughout Illinois, particularly in wooded areas, grasslands, and parks across the state. American dog ticks and lone star ticks are the primary species found in Illinois. Tick-borne illnesses such as Lyme disease can result from tick bites, though most people who are bitten do not become infected.
Are they in Illinois?
Ticks are abundant throughout Illinois, especially in wooded areas, prairies, grasslands, and parks. American dog ticks are found statewide in grassy and brushy habitats, while lone star ticks have expanded their range into central Illinois in recent years. Brown dog ticks, though less common outdoors, are found in homes and sheltered areas throughout the state. The Shawnee National Forest in southern Illinois, forests along river valleys, and wooded parks and nature preserves across the state support significant tick populations. Both urban and rural areas can harbor ticks, particularly where there is suitable vegetation and wildlife. OurTick in Illinoisguide offers detailed information on recognizing and preventing tick encounters throughout the state.
How dangerous is it?
Lyme disease is the primary disease of concern from tick bites in Illinois. Transmission can occur if an infected tick remains attached for 24 to 36 hours. Early symptoms of Lyme disease include a circular rash, fever, and muscle aches. With prompt antibiotic treatment, most cases resolve well. However, untreated Lyme disease can progress to more serious complications affecting joints, the heart, and the nervous system. Tick-borne relapsing fever and other diseases are also possible but less common in Illinois. Most tick bites do not result in disease transmission, and the risk is greatly reduced by prompt tick removal. Early detection and medical attention if symptoms develop are the best strategies for managing tick-borne illness risk.
How to recognize one
Ticks in Illinois are eight-legged arachnids ranging from the size of a sesame seed when unfed to approximately the size of a small pea when engorged. American dog ticks are reddish-brown with white or gray markings on their back. Lone star ticks are brown with a distinctive white spot or star-shaped marking on the female's back. Ticks hide in tall grass, leaf litter, shrubs, woodpiles, and under rocks and logs. They cling to vegetation waiting for a passing animal or person and then crawl onto your clothing and skin. Ticks are commonly found on the legs, feet, and behind the knees but can attach anywhere on the body. Check your skin carefully after spending time in tick habitat, and pay special attention to warm areas such as behind ears and in groin areas. Regular checks after exploringIllinois wildlifeareas are critical.
What to do if you are bitten or stung
If you find a tick attached to your skin, remove it promptly using fine-tipped tweezers. Grasp the tick as close to the skin as possible and pull steadily upward without twisting, crushing, or jerking the tick. Do not apply oil, petroleum jelly, heat, or other substances, as these can cause the tick to release bacteria into your body. After removal, clean the area with soap and water or rubbing alcohol. You can place the tick in a container for identification purposes if desired. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. Monitor the bite site for several weeks and watch for a circular rash or other symptoms that may indicate Lyme disease or other infections.
How to prevent encounters
Prevention is the best defense against tick bites in Illinois. Wear light-colored, long-sleeved shirts and long pants when hiking, gardening, or spending time in grassy or wooded areas. Tuck your pant legs into your socks or boots to prevent ticks from crawling up your legs. Apply tick repellent containing 20% DEET to exposed skin before heading outdoors. Permethrin can be applied to clothing and gear for additional protection. After returning indoors, perform a thorough body check, paying special attention to warm areas such as armpits, behind knees, and groin. Shower and wash all clothing in hot water, which kills ticks. Keep your yard maintained by mowing grass short, removing leaf litter, and clearing brush. Checkour wildlife guidesfor more comprehensive prevention strategies.
Where in Illinois and when
Ticks are found throughout Illinois, with particularly high populations in the Shawnee National Forest region, river valleys, and other wooded habitats. State parks, nature preserves, and forest preserves across Illinois support tick populations. Grasslands, prairies, and brushy areas throughout the state also harbor ticks. Ticks are most active from April through September in Illinois, with peak activity in May and June when nymphs are seeking their first blood meal. Adult ticks may also be active in late spring, summer, and early fall. Some ticks may remain active on warmer days in winter. People hiking, camping, or working outdoors should be especially vigilant during peak season.Wildlife in Illinoispreserves and natural areas carry the highest tick risk.
Harmless lookalikes
Several small arthropods found in Illinois are commonly mistaken for ticks, though they are generally harmless. Small beetles, mites, and spiders may resemble ticks due to their size and appearance. Chiggers are the larval stage of mites and are common in Illinois grasslands and forests. They cause itching similar to tick bites but do not transmit Lyme disease. Lice nits may also be confused with ticks. Seed ticks are young ticks that often cluster together and are sometimes mistaken for insects, but these are actual ticks and should be removed carefully. The most reliable way to identify a tick is to count the legs, as all ticks have eight while most insects have six. If you are uncertain, consultmore on Tick in Illinoisor take a photo to send to a local health department or pest control professional.
Frequently Asked Questions
What is the most effective way to remove a tick from my skin? Use fine-tipped tweezers to grasp the tick close to where it enters the skin and pull straight upward with steady pressure. Never twist, squeeze, or apply heat to the tick. How long does it take for Lyme disease symptoms to appear after a tick bite? Early symptoms of Lyme disease typically appear three to 30 days after infection, though some people develop symptoms much later. The most common early symptom is a circular expanding rash around the bite site. Can I contract Lyme disease from every infected tick? No, transmission requires the tick to be attached long enough to transmit the bacteria, which usually takes 24 to 36 hours. Prompt removal greatly reduces your risk. How should I dispose of a tick after removing it? Place the tick in a sealed container or wrap it tightly and dispose of it in the trash. Never crush a tick with your bare hands. For more safety information, consult yourIllinois wildlife guide.
Plan your trip
Best time to see tick in Illinois: May, April, June
See the month-by-month sighting calendar.
Plan your tick sighting in Illinois
7,929 verified tick records have been logged in Illinois, most recently in 2026. See the GBIF records.
Where to look in Illinois
- Lewis & Clark National Historic Trail · Wildlife Watching · Find hotels
- Lincoln Home National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Emmett Till and Mamie Till-Mobley National Monument · Find hotels
- Mormon Pioneer National Historic Trail · Find hotels
- New Philadelphia National Historic Site · Find hotels
- Pullman National Historical Park · Find hotels
Frequently asked questions
Are they in Illinois?+
Ticks are abundant throughout Illinois, especially in wooded areas, prairies, grasslands, and parks. American dog ticks are found statewide in grassy and brushy habitats, while lone star ticks have expanded their range into central Illinois in recent years. Brown dog ticks, though less common outdoors, are found in homes and sheltered areas throughout the state. The Shawnee National Forest in southern Illinois, forests along river valleys, and wooded parks and nature preserves across the state support significant tick populations. Both urban and rural areas can harbor ticks, particularly where there is suitable vegetation and wildlife. OurTick in Illinoisguide offers detailed information on recognizing and preventing tick encounters throughout the state.
How dangerous is it?+
Lyme disease is the primary disease of concern from tick bites in Illinois. Transmission can occur if an infected tick remains attached for 24 to 36 hours. Early symptoms of Lyme disease include a circular rash, fever, and muscle aches. With prompt antibiotic treatment, most cases resolve well. However, untreated Lyme disease can progress to more serious complications affecting joints, the heart, and the nervous system. Tick-borne relapsing fever and other diseases are also possible but less common in Illinois. Most tick bites do not result in disease transmission, and the risk is greatly reduced by prompt tick removal. Early detection and medical attention if symptoms develop are the best strategies for managing tick-borne illness risk.
More places to see tick
More wildlife in Illinois
Common questions about ticks