Are There Ticks at the Beach? What You Need to Know

Ticks absolutely live at and near beaches, and in some coastal areas they carry disease-causing pathogens at rates comparable to inland forests. A study of the northwestern California coast found that adult western black-legged ticks harboring the bacterium behind Lyme disease were present in beach habitats at the same frequency as in nearby woodlands. The risk is not uniform across every stretch of sand, though, and where you set your towel matters more than most beachgoers realize.

The Beach Is Not One Habitat

When people picture a beach, they think of open sand and surf. Ticks are unlikely to be sitting on bare, sun-blasted sand waiting for you. They need shade, humidity, and hosts, which means the transition zones just behind the beach are the real concern. Dune grass, coastal shrubs, maritime forests, and the brushy edges where trails meet the shore all provide the conditions ticks thrive in. On Shelter Island, New York, researchers found that nymphal blacklegged ticks were most abundant in forested areas and least common in dry, exposed habitats like open beach and grassland. But “least common” is not “absent,” and the forested patches on a barrier island can be just a short walk from where families picnic.

This distinction matters for your actual risk. If you stay on the open sand and swim, your tick exposure is minimal. But the moment you walk through dune grass to reach the shore, sit in a shaded area behind the dunes, hike a coastal trail, or let your dog run through beach vegetation, you are entering tick territory. In coastal dune ecosystems in the Netherlands, researchers documented that questing nymph density climbed sharply in areas with denser vegetation, while early-successional, open dune habitat supported far fewer ticks. The practical takeaway: the scrubby, vegetated edges of a beach carry far more risk than the waterline itself.

Which Ticks Live in Coastal Areas

Several tick species are well established in coastal environments, and the specific species you might encounter depends on your region.

Along the northeastern and upper midwestern coasts of the United States, the blacklegged tick (Ixodes scapularis) is the primary concern. This is the species responsible for transmitting Lyme disease, anaplasmosis, and babesiosis in eastern North America. Researchers placed adult female blacklegged ticks in individual microcosms in both forest floor and dune grass environments and tracked them across three consecutive winters. The ticks survived the winter in dune grass just as they did in the forest, confirming that coastal dune habitats are viable year-round homes for this species.¹

On the Pacific coast, the western black-legged tick (Ixodes pacificus) fills a similar ecological role. This is the species that was found carrying Lyme disease bacteria in beach areas at rates equal to those in inland woodlands in parts of northwestern California.²

The lone star tick (Amblyomma americanum) has expanded its range significantly in recent decades and is now common across much of the southeastern and mid-Atlantic coast. It is an aggressive biter that actively pursues hosts, unlike the blacklegged tick, which tends to wait on vegetation with its forelegs extended. Lone star ticks are associated with ehrlichiosis, tularemia, and a condition called alpha-gal syndrome that can trigger a red-meat allergy.

There is also a less-known player in coastal tick ecology. The seabird tick (Ixodes uriae) parasitizes colony-nesting marine birds like razorbills, puffins, and gulls. Researchers identified spirochetes in these ticks on a mammal-free island in the Baltic Sea, establishing that a Lyme-related disease cycle exists entirely within seabird colonies.³ On Gull Island in Newfoundland, roughly 40 percent of adult seabird ticks tested positive for Borrelia garinii, a species of Lyme-group bacteria more common in Europe than in North America.⁴ Seabird ticks rarely bite humans, but their existence shows that coastal bird colonies maintain independent reservoirs of tick-borne bacteria right at the shore.

How Ticks End Up on the Coast

Ticks do not fly, jump, or blow in on the wind. They get to coastal areas the same way they get anywhere else: on an animal. Two groups of animals are especially important for stocking beaches with ticks.

Migratory birds are efficient long-distance tick transporters. A study at a bird-ringing station on the Polish Baltic coast examined over 2,600 birds from 45 species during spring and autumn migration and collected more than 3,100 ticks, predominantly Ixodes ricinus larvae and nymphs.⁵ European robins and song thrushes were the most commonly examined hosts. Birds that forage on the ground in leaf litter are especially prone to picking up ticks, and when those birds stop at coastal staging areas to rest and refuel, their tick passengers drop off into new habitat. This means that even a stretch of coast that was previously tick-free can become colonized in a single migration season.

Small mammals play the other key role. White-footed mice are one of the most important reservoir hosts for the Lyme disease bacterium in eastern North America. These mice are abundant in dune grass and coastal scrub, and research has shown that they do remarkably little to remove ticks. In controlled experiments, white-footed mice did not increase their grooming in response to tick infestation, regardless of how many ticks were attached.⁶ That passive tolerance means each mouse can serve as a reliable feeding platform for many ticks, amplifying both the tick population and pathogen transmission in a local area.

Tracking studies along Michigan’s western coast documented the northward invasion of blacklegged ticks along the lakeshore, with the pattern most evident in ticks collected from rodents.⁷ Coastal corridors, with their linear strips of hospitable vegetation, seem to function as highways for tick range expansion. Deer, raccoons, and other medium-sized mammals that travel along these corridors contribute as well, carrying adult ticks into new territory.

Infected Ticks at the Beach Are Not Rare

One of the more surprising findings in recent tick research is that coastal tick populations are not some diluted, low-risk version of their forest counterparts. The California study that surveyed beach habitats found adult western black-legged ticks carrying Borrelia burgdorferi at rates similar to those in nearby woodlands.² This challenges a widespread assumption that beaches are safer than forests for tick-borne disease.

The overwintering study on the East Coast added another layer to this picture. Ticks infected with Borrelia burgdorferi actually had higher survival through the winter than uninfected ticks, and this held true in both forest and dune grass environments across three consecutive years.¹ The implication is unsettling: the bacterium may actually benefit the tick’s survival, which means infected ticks could accumulate in a population over time at a slightly faster rate than uninfected ones. In a coastal dune environment where ticks are already established, this survival advantage could push the proportion of infected ticks higher than you would predict from simple transmission models.

Beyond Lyme disease, tick-borne pathogens in coastal areas span a broad range. Depending on your region and the tick species present, the list of potential infections includes the agents of anaplasmosis, babesiosis, ehrlichiosis, spotted fever rickettsiosis, Powassan virus, and tick-borne encephalitis.⁸ Some of these are carried by the same tick that transmits Lyme disease, meaning a single bite can deliver more than one pathogen at once.

When Coastal Tick Activity Peaks

Tick activity on the coast follows seasonal patterns driven largely by temperature and humidity. Research along the coast of western Norway found that questing tick densities at lower elevations (around 100 meters above sea level, which captures much of the coastal zone) were substantially higher than those at about 400 meters. The season was longer near the coast too, with a prominent spring peak and a smaller autumn peak in some years.⁹ Tick activity correlated strongly with temperature: low below about 5°C, increasing with warmth, and leveling off above roughly 15 to 17°C. Interestingly, the researchers found no evidence that dry conditions suppressed questing in the range of conditions they measured, which suggests that coastal fog, sea breezes, and dune-grass microclimates may buffer against the desiccation that limits ticks in more exposed inland settings.

For beachgoers in the northeastern United States, the highest risk window for nymphal blacklegged ticks runs from late May through July. Nymphs are the life stage most responsible for transmitting Lyme disease to people because they are tiny (about the size of a poppy seed) and often go unnoticed. Adult ticks peak in autumn and early spring, and while they are larger and easier to spot, they still transmit pathogens. In the southeastern United States, lone star tick activity can stretch from early spring well into late summer. The point is that the beach season and the tick season overlap heavily.

How Dune Vegetation Shapes Your Risk

Coastal land managers are increasingly aware that the structure of dune vegetation directly affects tick-borne disease hazard. A study in a coastal dune ecosystem found that as shrubs encroach on open dune habitat, tick densities rise. Preserving early-successional, open dune landscapes and managing vegetation through targeted removal can reduce the hazard in areas where the public spends time.¹⁰

That same study found something else worth noting: sand lizards in the dune ecosystem appeared to lower the infection prevalence in nymphal ticks for both Borrelia burgdorferi and Anaplasma phagocytophilum. Lizards are what ecologists call “dilution hosts.” When a larval tick feeds on a lizard instead of a mouse, the tick is less likely to pick up a pathogen, because lizards tend not to harbor the bacteria efficiently. In areas where lizard populations are healthy, the proportion of infected ticks can drop. Coastal dunes that support diverse wildlife, including reptiles, may therefore carry a somewhat lower infection risk per tick than heavily mouse-dominated habitats, even if the total number of ticks is similar.

For you as a beachgoer, this translates into a practical observation: manicured, open beach areas are lower risk. The tangled, overgrown edges, especially where invasive shrubs have taken over dune habitat, are higher risk. If you are choosing where to access the beach, a wide-open boardwalk path through maintained dune grass is a better bet than bushwhacking through dense coastal scrub.

Ticks, Flooding, and Saltwater

Coastal areas deal with periodic flooding, storm surge, and tidal inundation. You might assume that saltwater exposure would wipe out tick populations near the shore, but the evidence suggests otherwise. When researchers submerged unfed adult lone star ticks in freshwater, brackish water, and saltwater, the ticks survived far longer than most people would expect. Lone star ticks lasted up to 70 days in freshwater, about 64 days in brackish water, and around 46 days even in full saltwater.¹¹ A related species, the Gulf Coast tick (Amblyomma maculatum), was less hardy, surviving a maximum of about 24 days in freshwater, but that is still far from instant death.

These findings matter for coastal flooding events. A hurricane storm surge or king tide that inundates dune habitat for a day or two is not going to eliminate the local tick population. Ticks clinging to vegetation above the waterline, burrowed into leaf litter, or attached to hosts can ride out temporary flooding without much trouble. Climate projections suggest that many coastal areas will experience more frequent flooding, and some researchers are watching whether this creates cycles of tick displacement and recolonization rather than outright die-offs.

Protecting Yourself at the Beach

The fact that ticks are present at beaches does not mean you should avoid the coast. It means you should take the same precautions you would on a woodland hike, especially when you are moving through vegetated areas near the shore.

Stay on open sand and paths: Bare sand and maintained boardwalks carry negligible tick risk. The moment you step into dune grass, shrubs, or shaded maritime forest, you are in tick habitat.
Treat clothing and gear: Permethrin-treated clothing repels and kills ticks on contact. You can buy pre-treated items or spray your own. It survives multiple washes and is one of the most effective preventive measures available.
Use repellent on skin: Products containing DEET, picaridin, or oil of lemon eucalyptus applied to exposed skin add another layer of protection.
Do a thorough tick check: After returning from the beach, check your entire body. Pay attention to the hairline, behind the ears, underarms, waistband, and behind the knees. Nymphal ticks are extremely small and easy to miss if you are not looking carefully.
Shower within two hours: Showering soon after coming indoors has been associated with lower rates of tick-borne disease, likely because it dislodges ticks that have not yet attached.
Check your dog: Dogs pick up ticks readily and can carry them into your home or car. Run your hands through their fur before loading them back into the vehicle.

A common mistake is assuming that a beach trip is inherently low-risk because you are near the ocean. People who would diligently use repellent on a forest hike will walk barefoot through dune grass without a second thought. The vegetation at the beach-forest margin, the trails through coastal scrub, and the grassy areas where people sit for picnics can all harbor questing ticks.

The Seabird Connection

Most tick-borne disease discussions focus on the cycle between ticks, mice, deer, and humans. But coastal environments host an entirely parallel cycle that has received less public attention. The seabird tick, Ixodes uriae, feeds on dozens of species of colony-nesting marine birds across both hemispheres. On islands and rocky headlands where seabird colonies breed, these ticks can be extremely abundant in and around nest sites.

The practical risk to beachgoers from seabird ticks is low, because the ticks are specialized feeders that rarely encounter humans. But the cycle is scientifically interesting because it demonstrates that Lyme-group bacteria have evolved to exploit marine ecosystems independently of the well-known terrestrial cycle. The Borrelia garinii found in seabird ticks in Newfoundland is a species more typically associated with European Lyme disease, and its presence in North Atlantic seabird colonies raises questions about whether migratory seabirds shuttle these bacteria across the ocean.⁴ For birdwatchers and wildlife biologists who handle nesting seabirds or enter dense colonies, the exposure risk is more meaningful. Wearing gloves and long sleeves when working in seabird colonies is standard practice for this reason.

The broader lesson is that tick-borne disease ecology at the coast is more complex than a simple extension of what happens in the woods. Coastal habitats support unique host communities, specialized tick species, and pathogen strains that do not circulate inland. Understanding that complexity does not change the basic advice for a day at the beach, but it does explain why researchers have become increasingly interested in the coast as a distinct frontier in tick-borne disease surveillance.