Boulder County Government: Boulder County Assessor To Send Home Value Notices May 1


April 28, 2021

Homeowners will receive their biennial valuation notice from the appraiser’s office in May. The appeal period runs from May 1 to June 1.

Boulder County, Colorado. – The Boulder County Assessor’s Office will send over 120,000 value notices to property owners on Saturday May 1st.

Every odd-numbered year, Colorado County appraisers are required to reassess properties under their jurisdiction and determine the market value of each property as of June 30 of the previous year. Therefore, this year’s revaluation cycle is based on market values ​​as of June 30, 2020.

Overall, in Boulder County, there has been a positive change in residential property values. The median percentage increase for residential type properties during this evaluation period is 11%.

Maps showing median changes in residential property values ​​from July 1, 2018 to June 30, 2020:

Homeowners can appeal their securities on the website – or by fax, mail, drop box, or email. Online tools are available at to help owners find comparable sales data and attach that information to their appeal.

COVID-19 restrictions and hours of public service

Due to COVID-19 restrictions, the Boulder County Courthouse (including the 2nd floor assessor’s office) is closed to the public.

  • To schedule a phone call with appraiser office staff, please use the online scheduling tool at or call 303-441-3530 (leave a voicemail message after hours).
  • Please note: The virtual office hours of the assessor are 7:30 a.m. to 5 p.m. Monday to Thursday. The office is closed for utilities on Fridays.
  • All residential property owners will receive a three-part Value Notice postcard in the mail that includes basic property appraisal information. Property owners can access a more traditional value notice at Anyone without access to a computer can call the office at 303-441-3530 to request that a traditional valuable notice be mailed to them free of charge.


    This press release was produced by the Boulder County Government. The opinions expressed here are those of the author.


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