Spotted Lanternfly inCarroll County, MDSPOTTED LANTERNFLY GUIDE
Carroll County is Maryland's agricultural heartland — a predominantly rural and small-town county confirmed for SLF in 2022 as populations expanded north and west from the Baltimore and Montgomery County core. Westminster, the county seat, serves as the commercial and civic hub for a county defined by rolling farmland, dairy operations, and orchards that face direct SLF feeding pressure. The I-795 corridor connects Carroll County to the Baltimore metro, serving as the primary vehicle for SLF introduction from the established urban zone. The Patuxent River headwaters flow through Carroll County, providing a natural spread pathway, and the Liberty Reservoir watershed is a sensitive ecological area that requires active monitoring. Carroll County's agricultural character — with significant nursery, grain, and fruit production — makes early detection and reporting especially important. The county is part of Maryland's statewide quarantine in effect since March 2026.
Maryland is under a statewide spotted lanternfly quarantine as of March 2026. Moving regulated articles — including plants, yard waste, and outdoor items — out of Maryland requires inspection.
Highest activity zones
SLF Hotspots in Carroll County, MD
Westminster downtown area
Active zone
I-795 corridor
Active zone
Liberty Reservoir watershed
Active zone
Patuxent River headwaters
Active zone
Agricultural farmland margins (Route 140 corridor)
Active zone
Primary SLF food source
Tree of Heaven in Carroll County, MD
Tree of Heaven is present along Carroll County's I-795 corridor, road margins, and creek edges throughout this agricultural landscape. The Westminster area stream corridors and the Route 140 agricultural corridor have Ailanthus populations in hedgerows and field margins adjacent to farmland, creating SLF host habitat within the county's most productive agricultural zones. Liberty Reservoir watershed edges and the Patuxent River headwater corridors are priority monitoring zones as SLF advances into this ecologically and agriculturally significant central Maryland county.
Identify Tree of Heaven →Local action resources
What To Do in Carroll County, MD
Report a Sighting
Every sighting in Carroll County, MD maps the invasion front. Report directly to Maryland Department of Agriculture.
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 MD State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full MD guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Carroll County, MD. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Carroll County, MD.
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