McHenry County deadline tracker

McHenry County 2026 assessment appeal deadlines

In McHenry 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 McHenry County sources: September 26, 2026. Statuses use America/Chicago time.

Open for 2026 filing

1 township
Open

McHenry Township

Deadline: October 5, 2026

7 days left. Published September 5, 2026.

Check my property

Publication date still TBD

9 townships
TBD

Alden 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

Hebron 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

Burton 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

Dunham 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

Marengo 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

Seneca 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

Nunda 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

Riley 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

Algonquin 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

7 townships
Closed

Hartland Township

2026 window closed: September 25, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window
Closed

Greenwood Township

2026 window closed: September 4, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window
Closed

Coral Township

2026 window closed: September 17, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window
Closed

Grafton Township

2026 window closed: September 3, 2026

Review record corrections, exemptions, and preparation for the next filing cycle.

See options if you missed the window

Deadline alerts

Get an email when a TBD township publishes

Choose one or more townships. We'll store your email and selections so a publication alert can be sent when the county posts the dates.

Official McHenry County sources

McHenry County publishes assessment notices by township. The county states that publication starts the 30-day Board of Review complaint period; city limits and township boundaries are not the same.

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