Spotted Lanternfly inDover, NHSPOTTED LANTERNFLY GUIDE
Dover, New Hampshire — the state's oldest city — entered a spotted lanternfly watch zone in 2025 as SLF detections expanded northward through New England. With a population of about 33,000, Dover's former Cocheco River mill buildings, rail corridors, and suburban greenways provide scattered Tree of Heaven habitat that could support early SLF establishment. Residents are encouraged to learn identification, check vehicles, and report any suspected sightings immediately to the NH Department of Agriculture.
Where it's showing up
Key Neighborhoods
Highest activity zones
SLF Hotspots
Downtown Dover
Active zone
Garrison Hill
Active zone
Sawyer Mills
Active zone
Bellamy River wildlife area
Active zone
Rochester border
Active zone
Primary SLF food source
Tree of Heaven in Dover, NH
Cocheco River banks running through Dover's historic mill district harbor Tree of Heaven populations that would serve as primary SLF habitat if the pest establishes. Former Garrison Manufacturing sites and other post-industrial areas around the city support opportunistic Tree of Heaven growth, and the Route 4 and Route 108 corridors are key movement pathways to monitor for incoming infestations.
Identify Tree of Heaven →Local action resources
What To Do in Dover, NH
Report a Sighting
Every sighting in Dover, NH maps the invasion front. Report directly to NH 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 NH State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full NH guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Dover, NH. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Dover, NH.
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