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Mesa County Assessor's Office
Important Dates for Property Owners 

  • The Assessor operates on a timetable established by law known as the assessment calendar. Some of the important dates with the Colorado Revised Statute (CRS) sites referenced which directly impact property owners are:

    Please click on the date to view the information

  •  January 1

    All taxable property is listed and valued based on its status as of this date. C.R.S. 39-5-105

    Property taxes for the prior year become due and payable. Taxes may be paid in full by April 30th or paid in two equal installments, the first installment is due by the last day in February and the second installment is due by June 15th. C.R.S. 39-10-102(1)(b)(I); C.R.S.39-10-104.5; Taxes are paid to the County Treasurer.


     Not later than January 10th

    Assessor delivers tax warrant to treasurer. C.R.S. 39-5-129


     By January 31st

    The property Tax statement (tax bill) is mailed to property owners by the Mesa County Treasurer’s Office. The levies shown on the bill are provided by the taxing entities by December 15 the prior year. C.R.S. 22-40-102(1),(3); C.R.S. 39-5-128(I)


     February 28

    First half of taxes must be received by County Treasurer (if paid in installments). C.R.S. 39-10-102(1)(b)(I); C.R.S. 39-10-105.5


     April 15

    The last date to return a list of all business personal property (equipment and furnishings) and oil and gas Declaration Schedules to avoid penalties. C.R.S. 39-5-108; C.R.S 39-5-113.5(1); C.R.S 39-6-106; C.R.S 39-6-111.5; C.R.S 39-7-101

    Property owner may request a 10 or 20 day extension for filing personal property schedule. C.R.S. 39-5-116(1)


     By April 30th

    Taxes must be received by County Treasurer (if paid in whole). C.R.S 39-10-102(1)(b)(I); C.R.S 39-10-104.5


     By May 1st

    The Assessor mails a Notice of Valuation annually to real property owners along with an appeal form. The assessor also gives public notice to all taxpayers concerning their right to appeal the value placed on their property. Colo. Const. 20, art X; C.R.S. 39-5-121(1); C.R.S 39-7-102.5

    Assessor mails senior citizen and disabled veteran exemption notices to residential real property owners. C.R.S. 39-3-204


     May 1 – June 1

    Assessor hears protests to real property valuation. C.R.S 39-5-122(1)


     June 1

    Last date to file a protest of real property valuation with County Assessor. C.R.S. 39-5-121(1); C.R.S. 39-5-122(1), (2)


     June 15th

    Assessor mails a Notice of Valuation with an appeal form to owners of taxable personal property (business equipment). Colo. Const. 20 art, X; C.R.S. 39-5-121(1.5); C.R.S. 39-5-113.3(2); C.R.S. 39-6-111.5; C.R.S. 39-7-102.5

    Taxpayer protests to Assessor for personal property begin. C.R.S. 39-5-122(1); C.R.S. 39-6-111.5; C.R.S. 39-7-102.5

    The Second half of Taxes must be received by County Treasurer (if paid in installments). C.R.S. 39-10-102(1)(b)(I); C.R.S. 39-10-104.5


     June 30th

    Assessor mails two copies of their decision (Notice of Determination) for all real property protests. C.R.S. 39-5-122(2); C.R.S. 39-5-122.7


     July 1st

    Applications for disabled veteran’s exemptions are submitted to the Division of Veterans Affairs. Applications bearing a postmark of July 1 are considered timely filed. C.R.S. 39-3-205(1) (b); C.R.S. 39-3-206; C.R.S. 39-3-206(1.5)(a); C.R.S. 39-3-206(2)(a.7)


     July 5th

    Assessor concludes personal property hearings. C.R.S. 39-5-122(4)
     July 10

    Assessor mails two copies of their decision (Notice of Determination) for all personal property protests. C.R.S. 39-5-122(2)


     July 15th

    To appeal the Assessor’s Office decision regarding a real property valuation protest, the property owner mails a copy of the Assessor’s real property Notice of Determination to the County Board of Equalization. Appeals bearing postmark on or before July 15 constitute proper filing. C.R.S. 39-8-106(1)(a)

    The County Board of Equalization (CBOE) begins hearing appeals of real and personal property valuations. C.R.S. 39-8-104

    Senior Property Tax Exemption forms must be completed and returned to the Assessor. If you have already returned one to the Assessor’s Office you do not need to reapply. C.R.S. 39-3-205; C.R.S. 39-3-206


     By July 20

    Property owner mails one copy of assessor’s personal property Notice of Determination to the County Board of Equalization. Appeals received or bearing postmark on or before July 20 constitute proper filing. C.R.S. 39-8-106(1)(a)


     August 5

    County Board of Equalization concludes hearings and renders decisions on real and personal property appeals. C.R.S. 39-8-107(2)


     By the 30th day after postmarked date on County Board of Equalization decision

    If Property Owner disagrees with County Board of Equalization (CBOE) decision the owner must file by the 30th day after postmark of the CBOE decision with the Board of Assessment Appeals, District Court, or Board of County Commissioners for Binding Arbitration. C.R.S. 39-8-108(1)


     August 15

    Assessor mails denial notice to residential real property owners returning incomplete or non-qualifying applications for Senior Exemption or Veterans Exemption. C.R.S. 39-3-206(1); C.R.S. 39-3-206(1.5)(b)


     September 1 – October 1

    Board of County Commissioners begins hearing appeals for denial of senior citizen and disabled veterans exemptions.


     Last week in December

    You may prepay your property tax the last week in December. Please contact the Mesa County Treasurer's office at (970) 244-1824.



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