Spotted Lanternfly inWashington County, NYSPOTTED LANTERNFLY GUIDE
Washington County is a rural agricultural county in the Lake Champlain valley — entered the SLF watch zone in 2023 as populations advanced along the US-4 corridor connecting the Capital District to Vermont and Whitehall. The county's largely agricultural landscape features dairy farms, orchards, and vegetable operations in the broad Champlain valley that face growing SLF pressure as the infestation frontier advances. Whitehall, the self-described birthplace of the U.S. Navy, sits at the southern terminus of the historic Champlain Canal, which historically served as a natural corridor between the Hudson Valley and Lake Champlain and today provides a linear route for SLF dispersal northward. The county's position between the active spread areas to the south and west and Vermont's border makes it a critical monitoring and early-detection zone.
Highest activity zones
SLF Hotspots in Washington County, NY
Lake Champlain valley agricultural corridor
Active zone
Whitehall Canal terminus
Active zone
US-4 transport corridor
Active zone
Fort Ann agricultural district
Active zone
Champlain Canal waterway margins
Active zone
Primary SLF food source
Tree of Heaven in Washington County, NY
Tree of Heaven is present along US-4 road margins and the Champlain Canal corridor through Washington County, providing SLF dispersal pathways from the established Capital District populations northward into the Lake Champlain valley. The Whitehall Canal terminus area and Fort Ann agricultural district road margins have Ailanthus colonization that extends SLF host habitat through the county's most important agricultural zones. Lake Champlain waterfront margins and the Vermont border transport corridors are priority monitoring sites as SLF approaches one of the most agriculturally and ecologically significant lake watersheds in the Northeast.
Identify Tree of Heaven →Local action resources
What To Do in Washington County, NY
Report a Sighting
Every sighting in Washington County, NY maps the invasion front. Report directly to New York State DEC.
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 Washington County, NY. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Washington County, NY.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Washington County, NY.