Spotted Lanternfly inLitchfield County, CTSPOTTED LANTERNFLY GUIDE
Litchfield County is northwestern Connecticut's rural and scenic county — the least densely populated county in Connecticut, known for the Litchfield Hills, Housatonic River valley, and an emerging wine country scene. Confirmed SLF in 2023, the county faces a distinctive spread risk profile driven by high second-home and weekend traffic from the New York City metro area: thousands of NYC-area residents travel I-84 into Litchfield County each weekend, arriving from established SLF infestation zones in Westchester County and Fairfield County. The Appalachian Trail passes through the county, and the Housatonic River corridor provides a natural SLF dispersal highway northward from confirmed CT populations. The Litchfield Hills wine country vineyards face direct SLF agricultural threat.
Highest activity zones
SLF Hotspots in Litchfield County, CT
Housatonic River valley corridor
Active zone
Appalachian Trail in Connecticut
Active zone
I-84 corridor from NY border
Active zone
Litchfield Hills wine country
Active zone
Lake Waramaug / second-home resort areas
Active zone
Primary SLF food source
Tree of Heaven in Litchfield County, CT
Tree of Heaven is present along the I-84 corridor from the New York border and Housatonic River valley margins throughout Litchfield County, providing SLF dispersal pathways from established Fairfield County and Westchester County populations into northwestern Connecticut. The Appalachian Trail corridor and Housatonic River greenway have Ailanthus colonization at the forest-rural interface that extends SLF habitat through the county's most ecologically sensitive landscapes. Lake Waramaug area resort road margins and wine country vineyard access roads are priority monitoring zones as high second-home visitor traffic from the NYC metro creates continuous SLF introduction risk throughout the Litchfield Hills.
Identify Tree of Heaven →Local action resources
What To Do in Litchfield County, CT
Report a Sighting
Every sighting in Litchfield County, CT maps the invasion front. Report directly to Connecticut Agricultural Experiment Station.
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 CT State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full CT guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Litchfield County, CT. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Litchfield County, CT.
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