Cook County Property Tax Appeal Deadlines & Due Dates 2026

Cook County Property Tax Assessment Calculator | KensingtonBelow is a 2026 listing of deadlines for appealing your property taxes in your township for both the Cook County Assessor and Board of Review.

  • Dates in green have been announced: the window to appeal is now open
  • Dates in red have passed: the window to appeal has closed
  • Dates in gray are estimated based on previous years

The earliest you can submit a property tax appeal is the date listed as “Open for Filing” and no property tax appeal will be accepted after the “Closed for Filing” deadline.

Learn why appealing by yourself can cost you more money than using Kensington

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Cook County Township
Cook County Assessor
Open for Filing
Cook County Assessor
Closed for Filing
Cook County Board of Review
Open for Filing
Cook County Board of Review
Closed for Filing
Barrington
July 03
August 15
September 22 / December 03
October 21 / December 12
Berwyn *
March 25
May 6
July 07 / December 03
August 05 / December 12
Bloom *
October 24
December 09
January 20
February 18
Bremen *
July 10
August 21
October 23 / December 03
November 21 / December 12
Calumet *
July 30
September 11
October 23 / December 03
November 21 / December 12
Cicero *
April 24
June 06
July 21 / December 03
August 19 / December 12
Elk Grove
May 06
June 18
August 18 / December 03
September 16 / December 12
Evanston
April 9
May 21
July 07 / December 03
August 05 / December 12
Hanover 
November 06
December 22
January 20
February 18
Hyde Park
August 04
September 16
October 23 / December 03
November 21 / December 12
Jefferson
August 21
October 03
November 20
December 19
Lake
September 22
November 04
January 05
February 03
Lake View
May 23
July 09
August 18 / December 03
September 16 / December 12
Lemont *
July 21
September 02
October 23 / December 03
November 21 / December 12
Leyden
July 21
September 02
October 23 / December 03
November 21 / December 12
Lyons *
June 02
July 16
August 18 / December 03
September 16 / December 12
Maine
June 04
July 18
September 22 / December 03
October 21 / December 12
New Trier
April 24
June 05
August 18 / December 03
September 16 / December 12
Niles
October 22
December 05
January 20
February 18
North Chicago
October 07
November 20
January 20
February 18
Northfield
June 17
July 31
September 22 / December 03
October 21 / December 12
Norwood Park 
March 24
May 5
July 07 / December 03
August 05 / December 12
Oak Park *
April 8
May 20
July 21 / December 03
August 19 / December 12
Orland *
September 10
October 23
January 05
February 03
Palatine
September 09
October 22
January 05
February 03
Palos
April 19
June 02
July 21 / December 03
August 19 / December 12
Proviso *
August 25
October 07
November 20
December 19
Rich *
October 21
December 04
January 20
February 18
River Forest *
March 7
April 18
July 07 / December 03
August 05 / December 12
Riverside *
March 7
April 18
July 07 / December 03
August 05 / December 12
Rogers Park
March 13
April 23
July 07 / December 03
August 05 / December 12
Schaumburg
October 02
November 17
January 05
February 03
South Chicago
October 15
November 28
January 20
February 18
Stickney *
June 11
July 25
September 22 / December 03
October 21 / December 12
Thornton *
October 01
November 14
January 05
February 03
West Chicago
July 09
August 20
September 22/ December 03
October 21 / December 12
Wheeling
August 18
September 30
November 20
December 19
Worth *
August 11
September 23
October 23 / December 03
November 21 / December 12

* South District Townships will be fully reassessed in 2026 as part of the triennial schedule.

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