Spotted Lanternfly inFairfield County, CTSPOTTED LANTERNFLY GUIDE
Fairfield County is Connecticut's first confirmed SLF county — and its position directly bordering Westchester County, NY, the most heavily SLF-affected New York suburb, has made it the primary entry point for SLF into New England. Confirmed in 2023, populations have been advancing through the county's dense commuter corridor as Metro-North New Haven Line service carries daily passenger traffic from the established Westchester and NYC infestation zones into Stamford, Greenwich, Norwalk, Bridgeport, and Danbury. The wealthy commuter corridor features extensive private property tree cover — mature ornamental and shade trees across large residential estates — creating abundant SLF habitat that is difficult to monitor systematically.
Highest activity zones
SLF Hotspots in Fairfield County, CT
Mianus River Gorge
Active zone
Audubon Society of Greenwich
Active zone
Metro-North New Haven Line corridor
Active zone
Saugatuck Reservoir
Active zone
Paugussett State Forest
Active zone
Primary SLF food source
Tree of Heaven in Fairfield County, CT
Tree of Heaven is established along Metro-North New Haven Line rail corridors and road margins throughout Fairfield County, providing primary SLF dispersal pathways from Westchester County northward into Connecticut. The Mianus River Gorge and Saugatuck Reservoir access roads have Ailanthus populations at the suburban-natural area interface. Paugussett State Forest edges and the Audubon Society of Greenwich grounds are priority monitoring zones as SLF populations continue to establish across this densely affluent and ecologically diverse county. Greenwich and Stamford's extensive private estate tree canopy creates monitoring challenges as SLF spreads through large-lot residential landscapes.
Identify Tree of Heaven →Local action resources
What To Do in Fairfield County, CT
Report a Sighting
Every sighting in Fairfield County, CT maps the invasion front. Report directly to CT CAES.
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 Fairfield County, CT. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Fairfield County, CT.
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