Spotted Lanternfly inJohnson County, IASPOTTED LANTERNFLY GUIDE

Johnson County is the home of Iowa City and the University of Iowa — a college community of nearly 75,000 residents with high student turnover, frequent travel to and from SLF-infested eastern states, and substantial goods movement along I-80. Designated as an SLF watch zone in 2025, Johnson County lies at a key convergence point on the westward advance front: I-80, one of the nation's busiest freight interstates, passes directly through the county and connects it to the Chicago logistics network that has been a primary SLF spread pathway across the Midwest. Coralville, directly adjacent to Iowa City, hosts large retail and industrial receiving operations that draw regular deliveries from Illinois and beyond. North Liberty and Tiffin are rapidly growing suburban communities along US-218 and IA-965 that receive high volumes of landscaping materials, nursery stock, and outdoor equipment — all documented SLF vectors. The Iowa River corridor threading through Iowa City provides riparian habitat where introduced SLF populations could establish and persist before spreading into the broader county landscape. University research programs at the University of Iowa have begun monitoring for SLF presence, making Johnson County one of the better-surveilled emerging risk zones in Iowa.