Spotted Lanternfly inAllegheny County, PASPOTTED LANTERNFLY GUIDE
Allegheny County, home to Pittsburgh and its surrounding suburbs, confirmed spotted lanternfly in 2021 as populations pushed westward across Pennsylvania. The county's dramatic topography of river valleys and hillside corridors — carved by the Allegheny, Monongahela, and Ohio rivers — channels SLF dispersal through densely populated communities from downtown Pittsburgh to suburban McKeesport, Monroeville, and Penn Hills. Former industrial brownfields and railroad cuts along hillsides provide abundant Tree of Heaven habitat that supports growing SLF populations throughout the Pittsburgh metro.
Pennsylvania is under a statewide spotted lanternfly quarantine. Moving plants, outdoor items, or vehicles out of the quarantine zone requires inspection.
Highest activity zones
SLF Hotspots in Allegheny County, PA
Pittsburgh City
Active zone
McKeesport
Active zone
Monroeville
Active zone
Bethel Park
Active zone
Penn Hills
Active zone
Primary SLF food source
Tree of Heaven in Allegheny County, PA
Tree of Heaven is well established along the Three Rivers confluence corridor, railroad cuts along hillsides throughout the county, and former industrial brownfields that span much of the Pittsburgh metro. These disturbed-ground habitats are ideal for Ailanthus colonization and create extensive SLF host networks connecting urban Pittsburgh neighborhoods to outer suburban communities.
Identify Tree of Heaven →Local action resources
What To Do in Allegheny County, PA
Report a Sighting
Every sighting in Allegheny County, PA maps the invasion front. Report directly to PA Dept 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 Allegheny County, PA. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Allegheny County, PA.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Allegheny County, PA.