Boone County deadline tracker

Boone County 2026 assessment appeal deadlines

In Boone County, you don't get one countywide deadline. Each township publishes its assessment list in a local newspaper, then you generally have about 30 days to file with the Board of Review. City limits are not township lines — check your parcel.

How to use this tracker Find your township → note its status → if open, run a free estimate; if TBD, get an alert; if closed, review next-step options.
Open — You can still file for 2026. TBD — The assessment list is not published yet. Closed — The 2026 Board of Review window ended.

Verified against Boone County sources: October 7, 2026. Statuses use America/Chicago time.

Open for 2026 filing

0 townships

Publication date still TBD

9 townships
TBD

Manchester Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

LeRoy Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Caledonia Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Boone Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Belvidere Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Bonus Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Flora Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Spring Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

TBD

Poplar Grove Township

Not published yet. The 2026 filing deadline has not been posted.

You can prepare now, but confirm the official publication before treating the window as open.

2026 filing window closed

0 townships

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Official Boone County sources

Boone County's 2026 Preamble and Publication List are posted. The Board of Review rules say appeals must be filed on or before 30 days after the assessment-roll publication date, and that the filing date will be published on the Boone County website. As of 2026-10-07 CT, no calendar filing deadline is posted — township deadline rows stay TBD (do not invent a date). Rules accept one copy of the appeal form and evidence by mail, email to assessor@boonecountyil.gov, or hand delivery; faxes are not accepted. Belvidere Township notes that 2026 change-of-assessment notices were mailed September 28, 2026.

Disclaimer: HomeTaxChallenge is not a government agency and is not affiliated with the Boone County Assessment Office or Boone County Board of Review. Always confirm dates on the official county sources above. This is not legal, tax, or appraisal advice.