Spotted Lanternfly inNorthampton County, PASPOTTED LANTERNFLY GUIDE
Northampton County — with Bethlehem as county seat — is in the heart of Pennsylvania's Lehigh Valley, the second most impacted SLF region in the state after Berks County ground zero. Confirmed in 2019, the county sits at a critical bi-state chokepoint: Easton at the PA/NJ state line has been a primary corridor for SLF spread into New Jersey, with the Delaware River bridges carrying vehicles and freight that move SLF populations across the state border. Delaware Water Gap National Recreation Area forms the county's eastern boundary, and the historic canal towns along the Delaware River face sustained SLF pressure throughout the growing season.
Highest activity zones
SLF Hotspots in Northampton County, PA
Delaware Water Gap NRA
Active zone
Easton waterfront (Delaware River)
Active zone
Forks of the Delaware
Active zone
Jacobsburg Environmental Education Center
Active zone
Bethlehem Steel Stacks area
Active zone
Primary SLF food source
Tree of Heaven in Northampton County, PA
Tree of Heaven is well established along the Delaware River corridor throughout Northampton County, particularly at the Forks of the Delaware near Easton and in the Delaware Water Gap NRA buffer zones. The Bethlehem Steel Stacks area — an industrial brownfield now repurposed as a cultural venue — has significant Ailanthus colonization in the surrounding margins. Jacobsburg Environmental Education Center and river corridor road margins are priority ToH monitoring zones as populations continue to drive SLF spread across the PA/NJ border.
Identify Tree of Heaven →Local action resources
What To Do in Northampton County, PA
Report a Sighting
Every sighting in Northampton 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 Northampton County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Northampton County, PA.
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