Assessors Office

News & Information

Real Property Value Appeals were accepted May 1 through June 8, 2023
Business Personal Property Appeals were accepted June 15 through June 30, 2023

The Assessor’s Office will mail Notices of Determination to property owners who file on-time appeals on or before August 15, 2023. Property owners will have until September 15, 2023 to appeal their determination to the Board of Equalization.

Overview

The Assessor’s Office establishes values every two years for more than 120,000 properties within Boulder County, worth more than $120 billion in market value, using tools such as geographic information systems (GIS) and mass appraisal techniques to perform the appraisal analysis. Property values are used to set tax amounts which the Treasurer’s Office administers and collects.

Connect With Us

• Assessor/Treasurer Change of Address form.
• View the Assessor A-Z guide.
• Ask a question about your Business Personal Property. Appeals are accepted June 15–30 each year.
• Ask a question about your Real Property. Appeals are accepted May 1–June 8 each year.
• Ask a question about your Senior Exemption. Applications must be filed by July 15.
• Search for your Notice of Value (NOV) online.