Spotted Lanternfly inWestchester County, NYSPOTTED LANTERNFLY GUIDE
Westchester County is the most SLF-affected county in New York State outside the NYC boroughs — confirmed in 2020, it has become the primary SLF establishment zone for the Hudson Valley and Metro-North commuter corridor. The county's dense suburban forest, extensive park system, and three Metro-North rail lines (Harlem, New Haven, and Hudson) have accelerated SLF spread northward. As New York's largest wine-producing county, Westchester's vineyards face sustained SLF pressure, and the dense commuter traffic flowing into NYC makes this county a critical node in the regional spread network.
Highest activity zones
SLF Hotspots in Westchester County, NY
Bronx River Parkway (tree corridor)
Active zone
Teatown Lake Reservation
Active zone
Saxon Woods Park
Active zone
Muscoot Farm (SLF monitoring site)
Active zone
Cross Westchester Expressway corridor
Active zone
Primary SLF food source
Tree of Heaven in Westchester County, NY
Tree of Heaven is well established along the Bronx River Parkway corridor and road margins throughout Westchester County. The Bronx River corridor provides a continuous Ailanthus highway from Yonkers into the heart of the county. Cross Westchester Expressway margins and rail corridor embankments are heavily colonized, fueling SLF populations that spread with every commuter train and vehicle movement.
Identify Tree of Heaven →Local action resources
What To Do in Westchester County, NY
Report a Sighting
Every sighting in Westchester County, NY maps the invasion front. Report directly to NY Department of Agriculture & Markets.
Report Now →Squish on Sight
See a spotted lanternfly? Kill it immediately — it is legal and encouraged in all states. Learn the best kill methods.
Full Fight Guide →Map ToH in Your Block
Tree of Heaven removal cuts off SLF food supply. Add ToH sightings to the community map to guide removal efforts.
View Sighting Map →Statewide resources
Full NY State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full NY guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Westchester County, NY. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Westchester County, NY.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Westchester County, NY.