Westchester County consistently ranks among New York's highest counties for Lyme disease cases. This complete guide covers deer tick biology, peak risk windows, and what property-specific factors determine your family's exposure.
Westchester County is not just a tick problem area — it is consistently among the highest-reporting counties in all of New York State for Lyme disease cases. The geography, ecology, and development patterns of Westchester have created nearly ideal conditions for deer tick populations to thrive in close proximity to tens of thousands of homes.
The deer tick (Ixodes scapularis), also called the blacklegged tick, is the species responsible for transmitting Lyme disease, anaplasmosis, and babesiosis in the Northeast. It has a two-year life cycle with four stages: egg, larva, nymph, and adult. Each active stage requires a single blood meal to advance. Larvae feed primarily on small mammals — especially the white-footed mouse, which is the primary reservoir for Borrelia burgdorferi, the bacterium that causes Lyme disease.
Nymph ticks are active from May through early July and are roughly the size of a poppy seed — 1 to 2 millimeters. They are nearly impossible to spot on skin, clothing, or scalp, which means they frequently feed for the 24 to 48 hours needed to transmit Lyme disease before being detected. Nymph ticks are responsible for the majority of Lyme disease cases in the Northeast, making the May–June window the highest-risk period of the tick season.
This is the period when professional barrier treatment matters most. If your first application of the season does not go down until July, you have missed the highest-transmission window.
The single strongest predictor of tick abundance on a residential property is proximity to wooded habitat. Ticks concentrate at the edges between managed lawn and unmaintained vegetation. The 10-foot transition zone where your lawn meets woods, brush, or dense shrubs is where 80% or more of tick encounters happen.
Stone walls are a signature landscape feature in northern Westchester towns like Pound Ridge, Bedford, and North Salem — and they are prime tick habitat. The gaps and cavities in stone walls provide shelter, moisture, and temperature stability that small mammals — and the ticks that feed on them — prefer. Properties with extensive stone walls typically have measurably higher tick populations.
White-tailed deer serve as reproductive hosts for adult deer ticks. A single deer can carry hundreds of ticks at a time. In Westchester, deer have high population density across much of the county, and their movement corridors through wooded lots and greenway trails create tick distribution pathways that reach deep into suburban neighborhoods.
Ticks are vulnerable to desiccation — they cannot survive in dry, sunny, exposed conditions. Leaf litter, wood piles, and brush provide the humidity and protection ticks need to remain active. Homes with significant leaf accumulation around the foundation or in shrub beds maintain tick populations longer and at higher levels than properties with maintained vegetation.
A professional tick barrier treatment applies a residual insecticide to the vegetation at the edges and perimeter of your property — shrub beds, wooded borders, ornamental plantings, and transition zones. The product coats the surface of leaves and stems where ticks rest and quest, killing them on contact and providing residual protection for 30 to 45 days.
The Bugs Stop Here provides professional tick barrier treatment programs throughout Westchester County. We serve Scarsdale, Chappaqua, Pound Ridge, Bedford, Armonk, White Plains, Bronxville, Larchmont, Mamaroneck, and all surrounding communities. Call (631) 563-3900 to schedule before tick season begins.
The northern and eastern portions of Westchester — including Pound Ridge, North Salem, Bedford, Armonk, and Chappaqua — have the highest tick pressure due to large forested land, high deer density, and stone wall corridors. Scarsdale, Bronxville, and Larchmont have lower but still significant risk, particularly in yards bordering wooded areas.
Deer ticks are active from April through November in Westchester. The highest-risk window is May through June when nymph ticks are feeding. Adults are active in spring and again in fall, with a notable surge in October. Ticks can remain active on mild winter days above 35 degrees F.
A barrier treatment applies a residual insecticide to the vegetation at the perimeter of your property — the edges, shrub beds, and transition zones where ticks concentrate. The product remains active for 30 to 45 days. A three-application program (April, June, September) covers the full active season.
Yes. Stone walls are prime tick habitat because they retain moisture, provide shelter, and are heavily trafficked by small mammals like white-footed mice — which are the primary reservoir for the Lyme disease bacterium and serve as larval tick hosts. Treating stone walls during barrier applications is an important part of tick management on Westchester properties.
Yes. We serve all of Westchester County including Scarsdale, Chappaqua, Pound Ridge, Bedford, Armonk, White Plains, Bronxville, and every surrounding community. Call (631) 563-3900 for a seasonal tick program consultation.
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