Spotted Lanternfly inWilliamsport, PASPOTTED LANTERNFLY GUIDE
Williamsport — Lycoming County seat and home of the Little League Baseball World Series — confirmed SLF in 2018 and is now heavily infested. The LLBWS brings tens of thousands of visitors from across the US and internationally each August — exactly when SLF adults are at peak activity. This creates an extraordinary vehicle-based spread event concentrated in one of Pennsylvania's most SLF-active months. The Susquehanna River West Branch waterfront provides prime Tree of Heaven habitat through the urban core, and the I-180 corridor connects Williamsport to the broader central Pennsylvania infestation zone. Historic Millionaires' Row's stately street tree canopy adds significant SLF habitat in the heart of the city.
Where it's showing up
Key Neighborhoods
Highest activity zones
SLF Hotspots
Little League Baseball World Series complex (major August vehicle event)
Active zone
Susquehanna River West Branch waterfront (heavy TOH along banks)
Active zone
I-180 corridor margins
Active zone
Lycoming College campus greenspaces
Active zone
Millionaires' Row historic street tree canopy
Active zone
Primary SLF food source
Tree of Heaven in Williamsport, PA
The Little League Baseball World Series in August is the most concentrated vehicle-based SLF spread event in Lycoming County — tens of thousands of visitors arriving from across the country during peak adult SLF season deposit and collect egg masses on vehicles parked throughout the Williamsport area. The Susquehanna River West Branch waterfront has dense Tree of Heaven populations along both banks, providing prime SLF habitat running through the urban core. I-180's commercial corridor margins have established TOH connecting Williamsport to the broader central Pennsylvania SLF corridor. Lycoming College's campus greenspaces and Millionaires' Row's historic street tree canopy sustain large SLF populations through Williamsport's most prominent residential and civic landscapes.
Identify Tree of Heaven →Local action resources
What To Do in Williamsport, PA
Report a Sighting
Every sighting in Williamsport, PA maps the invasion front. Report directly to Pennsylvania 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 Pennsylvania State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full Pennsylvania guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Williamsport, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Williamsport, PA.
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