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Assessor’s Office

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.

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

How to Appeal Your Property Value

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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.

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Phone: 303-441-3530
Fax: 303-441-4996


Mailing Address
PO Box 471
Boulder, CO 80306-0471

*New as of Jan 4, 2021*
Monday thru Thursday
Hours: 7:30 am–5 pm


Assessor Boulder & Longmont Drop Boxes

1325 Pearl Street, 2nd floor
Boulder, CO 80302
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515 Coffman Street, Suite 114
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1376 Miners Drive, Unit 105
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