Saturday March 2, Red Flag Warning. No Open Burning in Boulder County

Assessor’s Office
Boulder Valley farmland landscape, with mountains to the right

Assessors Office

News & Information

Senior Exemption Applications

Senior Exemption Applications are currently being accepted through July 15. Please visit the Senior Exemptions page to learn more.

Qualifying Veteran with a Disability Exemption & Gold Star Spouse Applications

Qualifying Veteran with a Disability and Gold Star Spouse Exemption Applications are currently being accepted through July 1. Please visit the Veteran Related Exemptions web page to learn more.

Property Values for 2023

On November 20, 2023, Governor Polis signed Senate Bill 23B-001. For 2023 only (taxes payable in 2024) this legislation temporarily reduces the assessment rate for residential property to 6.7% and adjust market values by $55,000. These changes are reflected in tax bills. Please contact County Treasurer’s Office for information about tax bills.

Property owners that disagree with the market values determined by the Assessor on their 2023 tax bill may qualify to file for an abatement if they did not previously protest their 2023 valuation. Please visit our Property Tax Abatement page to learn more.

Business Personal Property

The owners of taxable personal property in Boulder County as of January 1 must file a Business Personal Property Declaration. In 2024, the deadline to file a Business Personal Property Declaration is April 15. Please visit the Business Personal Property Declarations page to get started.

For more information about what Business Personal Property is, please see the Business Personal Property Overview.

Assessor 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

Services & Information

Contact Us

Assessor

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

Email

Mailing Address

PO Box 471
Boulder, CO 80306-0471

Hours: 7:30 a.m. to 5 p.m.
Monday-Thursday
Closed Friday

Locations

Assessor Boulder and Longmont Drop Boxes

Boulder

1325 Pearl St., 2nd floor
Boulder, CO 80302
Hours: 7:30 a.m. to 5 p.m.
Monday-Thursday
Map and Directions Boulder Location

Longmont

515 Coffman St., Suite 114
Hours: 7:30 a.m. to 5 p.m.
Monday only
Map and Directions Longmont Location

Lafayette

1755 S Public Road
Hours: 7:30 a.m. to 5 p.m.
Tuesday only
Map and Directions Lafayette Location