Spotted Lanternfly inBaltimore County, MDSPOTTED LANTERNFLY GUIDE
Baltimore County surrounds Baltimore City and is one of Maryland's most populous and SLF-affected counties, confirmed in 2022 as populations spread outward from the Baltimore metro core. The I-695 Beltway and I-83 Jones Falls corridor are primary SLF spread vectors, channeling traffic through the county and reinforcing infestation from established populations to the north and west. Gunpowder Falls State Park and the Loch Raven Reservoir watershed provide extensive natural corridors where SLF populations can establish and expand across the county's diverse mix of suburban, forested, and agricultural landscapes. Towson, the county seat, and BWI Airport proximity add significant freight and vehicle spread pressure throughout the county.
Maryland is under a statewide spotted lanternfly quarantine as of March 2026. Moving regulated articles out of Maryland requires inspection.
Highest activity zones
SLF Hotspots in Baltimore County, MD
Gunpowder Falls State Park
Active zone
Loch Raven Reservoir watershed
Active zone
I-695 Beltway corridor
Active zone
I-83 Jones Falls corridor
Active zone
Towson town center area
Active zone
Primary SLF food source
Tree of Heaven in Baltimore County, MD
Tree of Heaven is established along Baltimore County's stream corridors, I-695 Beltway margins, and the I-83 Jones Falls greenway, creating primary SLF dispersal pathways through the heart of the Baltimore suburban ring. Gunpowder Falls State Park and the Loch Raven Reservoir watershed have Ailanthus populations along riparian margins and forest edges that fuel SLF spread through these ecologically significant water supply and recreation lands. Towson town center road margins and BWI Airport perimeter areas are priority monitoring zones as constant freight and passenger traffic reinforces SLF populations across this densely populated county.
Identify Tree of Heaven →Local action resources
What To Do in Baltimore County, MD
Report a Sighting
Every sighting in Baltimore County, MD maps the invasion front. Report directly to Maryland 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 MD State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full MD guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Baltimore County, MD. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Baltimore County, MD.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Baltimore County, MD.