Spotted Lanternfly inMonmouth County, NJSPOTTED LANTERNFLY GUIDE
Monmouth County is a Jersey Shore county where SLF was confirmed in 2020 and has become heavily established across a landscape of beach tourism, horse farms, and commuter suburbs. Freehold is the county seat. The NJ Transit North Jersey Coast Line cuts through the county, serving as a primary spread vector moving SLF populations south from the heavily infested Newark and Middlesex County zones. The county's significant equine industry — with horse farms spread throughout the rural western townships — faces ongoing SLF feeding pressure on ornamental and shade trees. Monmouth Park Racetrack and the Navesink River corridor are notable SLF activity zones, and Sandy Hook National Recreation Area represents a critical ecological monitoring site at the county's northern tip.
Highest activity zones
SLF Hotspots in Monmouth County, NJ
Holmdel Park
Active zone
Manasquan Reservoir
Active zone
Sandy Hook Gateway NRA
Active zone
Monmouth Battlefield State Park
Active zone
Navesink River waterfront
Active zone
Primary SLF food source
Tree of Heaven in Monmouth County, NJ
Tree of Heaven is established along NJ Transit North Jersey Coast Line rail embankments and road margins throughout Monmouth County, creating SLF dispersal corridors from the established Middlesex County infestation zone southward into the Jersey Shore communities. The Navesink River waterfront and Holmdel Park have Ailanthus populations in park margins and stream corridors that fuel SLF establishment through the suburban interior. Manasquan Reservoir road margins and Sandy Hook Gateway NRA disturbed edges are additional priority monitoring zones as SLF continues to spread through the county's diverse landscapes.
Identify Tree of Heaven →Local action resources
What To Do in Monmouth County, NJ
Report a Sighting
Every sighting in Monmouth County, NJ maps the invasion front. Report directly to NJ 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 NJ State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full NJ guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Monmouth County, NJ. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Monmouth County, NJ.
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