Spotted Lanternfly inGaithersburg, MDSPOTTED LANTERNFLY GUIDE
Gaithersburg confirmed SLF in 2022. The I-270 biotech corridor and adjacent Seneca Creek State Park create a convergence of vehicle-based and natural spread vectors, making Gaithersburg one of the more active SLF zones in Montgomery County. Montgomery Village's extensive residential tree canopy and the MARC Brunswick commuter rail line add additional establishment and dispersal pathways. MD statewide quarantine in effect as of March 2026.
Where it's showing up
Key Neighborhoods
Highest activity zones
SLF Hotspots
Seneca Creek State Park margins (heavy ToH)
Active zone
I-270 biotech corridor highway margins
Active zone
Montgomery Village residential canopy
Active zone
MARC Brunswick Line rail corridor
Active zone
Great Seneca Creek stream valley
Active zone
Primary SLF food source
Tree of Heaven in Gaithersburg, MD
Seneca Creek State Park's margins are heavily colonized by Tree of Heaven, providing prime SLF habitat directly adjacent to Gaithersburg's residential neighborhoods. The I-270 biotech corridor's highway margins have established TOH populations running north through Montgomery County. The MARC Brunswick commuter rail line is a documented SLF spread vector, moving egg masses between Gaithersburg and the DC metro infestation zone to the south.
Identify Tree of Heaven →Active Quarantine Alert
Maryland is under a statewide spotted lanternfly quarantine as of March 2026. Moving plants, yard waste, or outdoor furniture out of Maryland may require inspection.
Local action resources
What To Do in Gaithersburg, MD
Report a Sighting
Every sighting in Gaithersburg, MD maps the invasion front. Report directly to Maryland MDA.
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 Maryland State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full Maryland guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Gaithersburg, MD. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Gaithersburg, MD.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Gaithersburg, MD.