Stage 1 Fire Restrictions, effective Aug. 12, 2025, for unincorporated western Boulder County.

Visit the Boulder County Ballot Measures website for information about possible 2025 ballot measures.

Boulder County government offices closed Monday, Sept. 1, in observance of Labor Day.

Senior Homestead Property Tax Exemption

Senior Homestead Property Tax Exemption

The Colorado Constitution establishes a property tax exemption for qualifying senior citizens, surviving spouses of senior citizens who previously qualified, and for Disabled Veterans.

If you wish to apply for the exemption, and qualified as of Jan. 1, 2025, and wish to receive a form to fill out, you may call our office at 303-441-3530, or email .

Senior Property Tax Exemption

Deadline

The deadline to apply for tax year 2025 has passed. The Assessor’s Office will begin accepting 2026 applications after Jan. 1, 2026. If you would like to get on our mailing list, you can email AssessorSX@BoulderCounty.gov. Please include your property address in your request.

Effect on Taxes

  • The exemption goes into effect for tax year 2025
  • The discount will first appear on the tax bill sent by the County Treasurer in January 2026
  • The exemption remains in effect until a disqualifying event occurs, such as:
    • Sale of property,
    • Property is moved into a trust, LLC, or other legal entity (a new application is required to continue the exemption),
    • Applicant passes away (Surviving spouse can apply to continue the exemption), or
    • Home is destroyed by a natural disaster.

Eligibility

To qualify for the 2025 tax year (payable in 2026), seniors must meet all three of the following criteria:

  • Born on or before Jan. 1, 1960
  • Lived in the home as your primary residence continuously starting before Jan. 1, 2015
  • Owned the home continuously starting before Jan. 1, 2015

Were you previously approved for the exemption? Learn more about the Qualified Senior Primary Residence Classification.

Exemption Amount

For those who qualify, 50 percent of the first $200,000 in actual value of their primary residence is exempted, for a maximum exemption amount of $100,000 in actual value. The State of Colorado pays the property taxes on the exempted value.
Applications are also available at the Assessor’s office, senior centers and other locations.

Questions

If you have any questions, please email .

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