Winnebago County’s 2026 Complaint Deadlines Depend on Township
Winnebago County has published two 2026 Board of Review complaint deadlines based on township: September 4 or September 5.
Official source
Winnebago County Board of Review:
https://wincoil.gov/departments/supervisor-of-assessments/board-of-review
Source reviewed August 2, 2026. Confirm the live county page and the township applicable to the property before relying on this summary.
September 4 townships
Cherry Valley, Durand, Laona, Owen, and Rockford.
September 5 townships
Burritt, Harlem, Harrison, Pecatonica, Rockton, Roscoe, Seward, Shirland, and Winnebago.
The county also publishes later additional-evidence dates that vary according to the township group and the size of the requested reduction. Those dates should be taken from the current county page and the case instructions.
Begin with the township
Preserve the assessment notice and identify the parcel, township, publication date, assessed value, and complaint deadline. The county recommends contacting the township assessor when an assessment may be incorrect; that conversation should not be assumed to replace a timely formal complaint.
Keep official assessment data, homeowner-provided evidence, and analytical comparisons separate. Save the final complaint, evidence, and proof of submission.
FairPath prepares organized documents for homeowner review and use. The homeowner decides whether and how to file and communicates directly with the township and county. FairPath does not guarantee acceptance, an assessment change, tax savings, or another outcome.
