Pests and pest control in Rockford, IL

Pests to know in Rockford

• Bats (big brown bat and little brown bat)
• Ticks
• Emerald Ash Borer
• Subterranean termites
• American Dog Tick

Why each one matters here is cited in the sections below.

Termites in Rockford

University of Illinois Extension says swarms of the state's common subterranean termite are often seen in spring but can happen during most warm months in Illinois.^[7]

Invasive species reported here

Emerald ash borer was confirmed in Winnebago County in summer 2010; the City of Rockford says ash makes up about 15% of its roughly 70,000 street trees.^[6]

Pests local experts flag

• Ticks collected in Winnebago County have tested positive for Powassan virus for the first time, and the county health department urges residents to prevent tick bites.^[5]
• IDPH says the blacklegged (deer) tick has turned up in many Illinois counties but has recently been common mostly in limited areas of northern Illinois.^[9]
• IDPH says the northern black widow is the most common widow spider in northern states such as Illinois.^[10]

Climate

Central Rockford (ZIP 61104) is in USDA plant hardiness zone 5b, where the average coldest winter night is -15 to -10°F.^[11]

Public agencies that handle pests

• The Winnebago County Health Department's vector control program monitors mosquitoes and dead birds for illness and conducts seasonal tick drags and tick identification.^[1]
• Winnebago County residents can report standing water and dead birds to the health department, which also points people to The Tick App for reporting ticks.^[2]
• If a bat is found in a Winnebago County home, the health department says to call Winnebago County Animal Services to capture and remove it so rabies risk can be assessed.^[4]

Hiring a licensed company

In Illinois, structural pest control is licensed by IDPH, and a business must employ at least one certified technician before it can obtain a license.^[8]

Licensing agency: Illinois Department of Agriculture — Bureau of Environmental Programs^[12].

See also how to check a pest control license.

Free local help

University of Illinois Extension relays an entomologist's advice that a 12- to 18-inch bare dirt strip around the foundation is the best defense against most insects, termites included.^[7]

Through the year

Summer

The Winnebago County Health Department says bats are the main animal found with rabies in Illinois, and human contact with bats rises in summer because of bat migration and feeding patterns.^[3]

Spring to Fall

In Illinois, American dog tick adults are most active in April, May and June and are rarely seen by September, according to IDPH.^[9]

Sources

1. Winnebago County Health Department, “Center for Environmental Health Improvement (EHI).” publichealth.wincoil.gov/center-for-environmental-health-improvement-ehi/ (accessed 2026-10-06)
2. Winnebago County Health Department, “Reduce Mosquito And Tick Populations.” publichealth.wincoil.gov/reduce-mosquito-and-tick-populations/ (accessed 2026-10-06)
3. Winnebago County Health Department, “Heighten Rabies Awareness.” publichealth.wincoil.gov/heighten-rabies-awareness/ (accessed 2026-10-06)
4. Winnebago County Health Department, “Report An Animal Bite or Rabies Exposure.” publichealth.wincoil.gov/how-do-i/report-an-animal-bite-or-rabies-exposure/ (accessed 2026-10-06)
5. Winnebago County Health Department, “Powassan Virus Found In Ticks From Winnebago County.” publichealth.wincoil.gov/powassan-virus-found-in-ticks-from-winnebago-county/ (accessed 2026-10-06)
6. City of Rockford Public Works, “Emerald Ash Borer.” rockfordil.gov/628/Emerald-Ash-Borer (accessed 2026-10-06)
7. University of Illinois Extension, “Termite Troubles: Three tips for preventing infestations.” extension.illinois.edu/blogs/good-growing/2024-07-26-termite-troubles-three-tips-preventing-infestations (accessed 2026-10-06)
8. Illinois Department of Public Health, “Structural Pest Control.” dph.illinois.gov/topics-services/environmental-health-protection/structural-pest-control.html (accessed 2026-10-06)
9. Illinois Department of Public Health, “Common Ticks.” dph.illinois.gov/topics-services/environmental-health-protection/structural-pest-control/common-ticks.html (accessed 2026-10-06)
10. Illinois Department of Public Health, “Brown Recluse and Black Widow Spiders.” dph.illinois.gov/topics-services/environmental-health-protection/structural-pest-control/brown-recluse-black-widow-spiders.html (accessed 2026-10-06)
11. USDA ARS and PRISM, via phzmapi.org, “Plant hardiness zone for ZIP 61104 (2023 USDA map data).” phzmapi.org/61104.json (accessed 2026-10-06)
12. National Pesticide Information Center, “State Pesticide Regulatory Agencies.” npic.orst.edu/reg/state_agencies.html (accessed 2026-10-06)