Spotted Lanternfly inRockford, ILSPOTTED LANTERNFLY GUIDE
Rockford — northern Illinois's largest city with about 148,000 residents straddling the Rock River — entered the SLF watch zone in 2025 as spotted lanternfly's range expanded northward through Illinois. The city's historic manufacturing legacy has left significant brownfield and disturbed land throughout the Rock River valley, creating ideal Tree of Heaven habitat ahead of the advancing SLF front. Winnebago County's position on US Route 20 and near the Wisconsin border makes Rockford a critical sentinel city for monitoring SLF spread into the upper Midwest.
Where it's showing up
Key Neighborhoods
Highest activity zones
SLF Hotspots
Downtown Rockford
Active zone
East Side
Active zone
Loves Park
Active zone
Machesney Park
Active zone
Route 20 corridor
Active zone
Primary SLF food source
Tree of Heaven in Rockford, IL
Rock River islands and banks running through the heart of Rockford support Tree of Heaven populations in riparian and disturbed floodplain habitat that form prime SLF establishment corridors through the city. Former manufacturing sites scattered across Rockford's East Side and along the Rock River retain dense Tree of Heaven colonization in brownfield habitat that requires early-detection prioritization. Burlington Northern rail yards on the south side of Rockford represent a major freight interchange with rail-margin Tree of Heaven that is a high-priority SLF introduction pathway as the pest continues its westward advance.
Identify Tree of Heaven →Local action resources
What To Do in Rockford, IL
Report a Sighting
Every sighting in Rockford, IL maps the invasion front. Report directly to Illinois 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 IL State Guide
County-level data, quarantine zones, treatment guides, and agency resources for the entire state.
See the full IL guide →Community intelligence
Live Sighting Map
See where SLF has been spotted near you in Rockford, IL. Add your own sighting to help map the front.
Open the Map →Free weekly fight briefing
Fight SLF in Rockford, IL.
One email per week. Your zip code. Your threat level. Your action plan. Know exactly what to do this week in Rockford, IL.