Spotted Lanternfly inLehigh County, PASPOTTED LANTERNFLY GUIDE
Lehigh County — with Allentown as its county seat — confirmed SLF in 2019 as the infestation expanded westward through the Lehigh Valley corridor between Berks County ground zero and the New Jersey border. The Lehigh Valley is a major distribution hub, and the freight traffic on I-78 and Route 22 has accelerated SLF spread throughout the county. Cedar Creek greenway with extensive Tree of Heaven and the Lehigh Parkway system are the primary SLF zones in the Allentown area, and Cedar Crest College campus is an active monitoring site.
Highest activity zones
SLF Hotspots in Lehigh County, PA
Cedar Creek Parkway
Active zone
Lehigh Parkway
Active zone
Allentown area parks
Active zone
Jordan Creek corridor
Active zone
Emmaus Rail Trail
Active zone
Primary SLF food source
Tree of Heaven in Lehigh County, PA
Tree of Heaven is well established along Lehigh County's stream corridors and road margins, particularly Cedar Creek Parkway and the Jordan Creek corridor through Allentown. The Cedar Creek greenway provides a continuous Ailanthus corridor through the heart of the county, fueling SLF establishment in urban and suburban zones alike. The Emmaus Rail Trail and I-78 road margins are additional high-priority ToH and SLF monitoring zones as populations continue to expand through the Lehigh Valley.
Identify Tree of Heaven →Local action resources
What To Do in Lehigh County, PA
Report a Sighting
Every sighting in Lehigh 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 Lehigh County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Lehigh County, PA.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Lehigh County, PA.