7 Tick Infested Areas In The United States

Ticks occupy nearly every region of the United States, but certain landscapes produce unusually high concentrations of specific species. For example, the Ozark Plateau has become heavily associated with dog ticks, while Nantucket Island remains a major center for blacklegged ticks linked to Lyme disease transmission.

In western Montana, isolated Rocky Mountain wood ticks still thrive across foothill grasslands tied to some of the country’s earliest tick-borne disease investigations. Then, to the south, Florida’s Gulf Coast prairie supports large populations of Gulf Coast ticks in habitat shared with cattle and wildlife.

From suburban Virginia forests to Texas border kennels, these locations represent some of the country’s most heavily tick-infested environments. Here is a more detailed run-down on them, covering which species are most prevalent, along with other notable things you may want to know before heading out.

The Ozark Mountains - Missouri/Arkansas

The Ozark Mountains, particularly southern Missouri and northern Arkansas, are a highly concentrated region for American dog ticks. The species is quite common throughout most of the eastern United States, but field surveys and public health monitoring consistently identify the Ozarks as a major hotspot for activity, so be extra careful the next time you're exploring this beautiful interior region.

American dog ticks thrive in transitional habitats rather than deep forest, making the Ozarks’ patchwork of woodland and open ground especially favorable. Large sections of this region combine exactly the conditions this species prefers: humid summers, thick grass, brushy forest edges, abundant wildlife hosts, and long warm seasons. Counties surrounding the Mark Twain National Forest tend to report heavy tick activity from late spring through midsummer, often along hiking trails, old logging roads, unmanaged fields, and other semi-open wilderness areas.

To add to this, dogs, white-tailed deer, raccoons, coyotes, and small mammals passing through all help sustain dense local populations by both feeding and transporting these parasitic little arachnids.

Hunterdon County - New Jersey

Not normally found at all in the western hemisphere, Asian longhorned ticks have made their way to spots like Hunterdon County and surrounding farming regions in western New Jersey in recent years. This Mid-Atlantic area has, in fact, become a known hotspot for the Asian longhorned tick, with its often humid climate, abundant deer populations, and concentration of cattle and sheep farms in this half of the Garden State providing optimal conditions for the species

They were first confirmed in the United States on a sheep farm in Hunterdon County in 2017, and the area continues to report dense populations in pastureland, overgrown fields, and wooded edges, typical of where you'd find most other kinds of ticks, too. But unlike many native ticks, Asian longhorned ticks can reproduce without mating, allowing populations to expand rapidly once established. Researchers have even documented thousands of ticks on individual livestock animals at times in heavily infested areas.

Asian longhorned ticks are actually established across multiple eastern states now, but New Jersey remains the center of the original U.S. outbreak, and among the most intensively monitored regions for their activity and spread for that reason.

Nantucket Island - Massachusetts

Nantucket Island, Massachusetts, is among the highest-density locations in the United States for blacklegged ticks. Surveys across coastal New England consistently show that the island’s fragmented oak forests and high white-tailed deer population support large tick populations in turn. It is part of a broader Northeast network where the blacklegged tick is now deeply established in nearly all of its suitable woodland habitat.

Like usual, warm, humid summers and milder winters when compared to much of the rest of the northern U.S. allow nymphs and adults to survive at high rates here, with activity often peaking in late spring and early summer. This combination of favorable habitat structure and climate produces frequent human and pet encounters in and around trails, yards, and coastal scrubland throughout this popular vacation destination.

Southern Border Counties - Texas

The brown dog tick is pretty widely spread across the board, but is most concentrated in the southern United States. Here, the highest sustained infestations are consistently reported in South Texas border cities, particularly around Laredo and the surrounding Webb County urban corridor. The majority of tick species in North America exclusively live outdoors, whereas this species is known to flourish in indoor and peridomestic environments, especially kennels, animal shelters, and homes with untreated dogs. As a matter of fact, public health and veterinary reports from the Texas-Mexico border region have documented repeated large-scale infestations in kennels and municipal shelters.

South Texas also provides year-round warmth that allows continuous breeding cycles without winter die-off, which is a key factor behind persistent high densities. On top of that, a high stray dog population, high domestic dog turnover, and climate-controlled indoor refuges add up to produce the perfect scenario for long-term establishment for this unique species.

Piedmont Region - Virginia

The Piedmont region of Virginia, which hosts a rural forest-pasture transition zone stretching from Loudoun County through Albemarle and into parts of Pittsylvania County, is a well-documented hotspot for lone star ticks, one of the most feared species for good reason. This area combines fragmented hardwood forests, old agricultural fields, and expanding suburban edge habitat, each featuring tick-carrying wildlife like white-tailed deer, turkeys, and small mammals, all abundant and act as key hosts across their various life stages. The lone star tick is recognizable by the female’s single white spot and is strongly associated with alpha-gal syndrome, the red meat allergy linked to certain tick bites.

Expanding deer populations and reforestation across the Piedmont have helped the species spread rapidly during recent decades, and thus, high numbers are found in regenerating forests, overgrown field edges, and deer paths. With that in mind, be extra cautious for lone star ticks in parks, hunting land, suburban greenbelts, and rural properties throughout central portions of the state.

Bitterroot Valley - Montana

Western Montana's Bitterroot Valley, just south of Missoula, is often regarded as the country’s primary hotspot for Rocky Mountain wood ticks. This hardy species loves sticking to open foothill grasslands, sagebrush slopes, and lightly wooded valley edges between about 4,000 and 10,500 feet in elevation.

What differentiates them from lone star ticks or blacklegged ticks is that Rocky Mountain wood ticks are most active during cooler spring weather, with adults emerging heavily during a shorter window from March through June. They frequently attach to elk, livestock, coyotes, deer, and humans moving through the low-lying vegetation common in their range

Notably, the Bitterroot Valley became historically important in tick research because it was the original center of Rocky Mountain spotted fever investigations of the early 1900s. Although that was quite some time ago, seasonal outbreaks still remain common in western Montana’s outdoor recreation and ranching areas today. Adult Rocky Mountain wood ticks are also relatively large and capable of transmitting Colorado tick fever and tularemia, too.

Lake Okeechobee - Florida

One of the greatest concentrations of Gulf Coast ticks is found in Florida’s Gulf Coast prairie region, namely the cattle ranchlands surrounding Lake Okeechobee and the green spaces extending south toward the Big Cypress area. Researchers regularly detect them during livestock surveys and wildlife monitoring projects across the freshwater-filled Lake Okeechobee region.

This southern-dwelling species thrives in this sub-tropical state's warm, moist grassland habitats that come with plenty of ground cover and large populations of feral hogs, deer, wading birds, and roaming cattle. They especially prefer very open terrain and are commonly collected from tall roadside grass, pastures, and marsh transition zones.

Adults are markedly aggressive feeders with long mouthparts that allow them to stay attached for extended periods. Gulf Coast ticks are also recognizable by the pale silver markings on their back and their relatively large size compared with several other southeastern ticks.

Tick populations exist virtually all across the contiguous United States due to its variety of climates, flora, fauna, and land use. From the forested parks of Virginia to the grasslands of Montana and the ranches in central Florida, a number of different species dominate very different environments. Understanding where American ticks are most concentrated explains why certain regions report higher rates of tick encounters and tick-borne illnesses year after year, as well as helps you avoid them for your safety.