Tick bites are far more common than most people realize. An estimated 31 million people in the United States experience a tick bite each year, meaning roughly 1 in 10 Americans will be bitten in any given year. That number makes tick bites one of the most frequent wildlife-related health concerns in the country, even though the vast majority never lead to serious illness.
How Many People Get Bitten Each Year
The 31-million figure comes from research examining both medical visits and self-reported bites, since most people who find a tick on themselves never go to a doctor. Emergency department data tracked by the CDC shows clear seasonal patterns, with visits for tick bites spiking in late spring and summer when ticks are most active and people spend more time outdoors. But bites can happen in early fall and even mild winter months in warmer regions.
Not all of those bites result in disease. The CDC estimates that roughly 476,000 people are diagnosed and treated for Lyme disease each year, the most common tickborne illness in the U.S. In 2023, over 89,000 Lyme disease cases were formally reported to state health departments, though official case counts consistently underrepresent the true number because many cases go unreported or are diagnosed clinically without laboratory confirmation. Even using the higher estimate, fewer than 2% of the estimated 31 million annual tick bites lead to a Lyme diagnosis.
Who Gets Bitten Most Often
Anyone who spends time outdoors in areas where ticks live is at risk, but certain groups face dramatically higher exposure. People who work in agriculture, landscaping, forestry, construction, utilities, and park or wildlife management encounter ticks as a routine occupational hazard. A study of U.S. Forest Service workers in the upper Midwest found that 97% reported recent tick exposure, and 70% said they found ticks on themselves “always” or “most of the time” while working. Among those same workers, 26% had a history of a tickborne disease, with 88% saying their diagnosis happened while working at their current job.
Globally, about 20% of outdoor workers who have been tested show evidence of past infection with the bacterium that causes Lyme disease. Forestry and agricultural workers are more than twice as likely to test positive compared to other occupationally exposed groups like veterinarians or soldiers. Between 2011 and 2020, an average of 969 U.S. workers per year reported tick bites serious enough to require days away from work, though that number captures only the most disruptive cases and likely represents a small fraction of total workplace bites.
Recreational hikers, campers, hunters, and gardeners also face significant exposure, particularly in the Northeast, upper Midwest, and mid-Atlantic states where tick populations are densest.
Which Ticks Bite People Most
Several tick species commonly bite humans in the U.S., but they vary widely in how dangerous those bites are. The American dog tick is one of the most frequently encountered species. It bites people often but rarely transmits disease. The blacklegged tick (sometimes called the deer tick) is responsible for the vast majority of tickborne disease cases, transmitting Lyme disease, anaplasmosis, and babesiosis. In states like Minnesota, the blacklegged tick causes far more tickborne illness than all other species combined.
The lone star tick, common across the southeastern and eastern U.S., has drawn increasing attention for its role in alpha-gal syndrome, a condition that triggers allergic reactions to red meat and other mammalian products. The number of documented alpha-gal syndrome cases has risen steadily since 2010, concentrated in the southern, midwestern, and mid-Atlantic regions. This geographic spread closely mirrors the range of the lone star tick, reinforcing the link between the two.
How Often Ticks Carry Disease
Finding a tick on your body does not mean you’ll get sick. The percentage of ticks infected with disease-causing pathogens varies enormously by region and by the tick’s life stage. In some areas, over 50% of blacklegged ticks carry the Lyme disease bacterium. In other areas, particularly throughout much of the Southeast, blacklegged ticks are almost never infected. This geographic variation is one reason Lyme disease clusters so heavily in the Northeast and upper Midwest.
Even when an infected tick bites you, transmission is not instant. The Lyme disease bacterium needs time to move from the tick’s gut to its salivary glands and into your bloodstream. This is why finding and removing ticks promptly matters so much. The sooner a tick is removed after it attaches, the lower the chance of infection. Daily tick checks after spending time in wooded or grassy areas remain one of the most effective prevention strategies, alongside wearing long clothing, using repellents, and showering soon after coming indoors.
Where Tick Bites Happen Most
Tick bite risk is not evenly distributed across the country. The highest concentrations of tickborne disease occur in the Northeast (from Virginia up through New England), the upper Midwest (Wisconsin and Minnesota in particular), and parts of the mid-Atlantic. These regions have both large blacklegged tick populations and high rates of infection within those populations.
The West Coast has its own species of blacklegged tick, but disease transmission rates tend to be lower there. The South and Southeast have abundant lone star ticks and dog ticks, meaning bites are common, but Lyme disease specifically is rare in those areas. Instead, southern states see more cases of conditions like ehrlichiosis, Rocky Mountain spotted fever, and the emerging alpha-gal syndrome. Your actual risk from a tick bite depends as much on where you live and which tick species are present as on how often you’re outdoors.