Assessor's Office

News & Information

Notices of Valuation mailed by May 1

The Boulder County Assessor’s Office has mailed Notices of Valuation to property in Boulder County where there have been changes that impact value. For properties whose value remained the same as 2021, the Property Tax Notice served as the Notice of Valuation. Notices of valuation are mailed to property owners on Friday, April 30.

• Letter to Properties Destroyed in Marshall Fire
• Letter to Properties Damaged in Marshall Fire

These maps display:

• 24-Month Median Value Increases for 2021-2022 Reappraisal of Single Family Residences
• 2021-2022 Boulder County Residential Values

Real Property Value Appeals are accepted May 1 through June 1, 2022

How to Appeal Your Property Value

Overview

The Assessor’s Office establishes values every two years for more than 120,000 properties within Boulder County, worth nearly $50 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 1 each year.
• Ask a question about your Senior Exemption. Applications must be filed by July 15.
• Search for your Notice of Value (NOV) online.
• 2020 Assessor’s Office State of the County video.