Spotted Lanternfly inYork County, PASPOTTED LANTERNFLY GUIDE
York County — confirmed for SLF in 2019 — sits at a critical geographic junction where the Susquehanna River corridor connects Pennsylvania populations to Maryland, and the I-83 freight corridor funnels traffic south toward Baltimore. The Codorus Creek greenway threading through York City has become a major urban SLF zone, lined with Tree of Heaven that supports dense populations through the summer and fall season. York County is a significant agricultural producer, with mushroom and nursery crops facing sustained SLF feeding pressure. The Mason-Dixon Trail and Susquehanna River waterfront are priority monitoring zones as SLF continues to push toward the Maryland state line.
Highest activity zones
SLF Hotspots in York County, PA
Codorus State Park
Active zone
Susquehanna River waterfront
Active zone
I-83/US 30 junction
Active zone
York City Greenway
Active zone
Mason-Dixon Trail corridor
Active zone
Primary SLF food source
Tree of Heaven in York County, PA
Tree of Heaven is well established along the Codorus Creek corridor through York City and along the I-83 and US 30 road margins throughout York County. The York City Greenway and Susquehanna River waterfront have dense Ailanthus populations that fuel SLF establishment in urban and riparian zones alike. The Mason-Dixon Trail corridor along the county's southern edge is a key monitoring zone as ToH-supported SLF populations drive the infestation front into Maryland.
Identify Tree of Heaven →Local action resources
What To Do in York County, PA
Report a Sighting
Every sighting in York County, PA maps the invasion front. Report directly to PA 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 PA State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full PA guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in York County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in York County, PA.
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