How to appeal your City and County of Denver property taxes

Step by step

1. Check your Notice of Valuation Denver mails Notices of Valuation by May 1. If the actual value looks higher than what your home would sell for, you have until November 15 to protest.
2. Pull the comparable sales Look up sales of similar homes in your neighborhood during the assessor's study period on the Denver assessor's property site — that's the evidence that wins.
3. File your protest by November 15, 2026 File with the Denver Assessor online, by mail, or in person. Filing is free.
4. Get the assessor's decision The assessor issues a written determination on your protest.
5. Escalate if needed Appeal the determination to the County Board of Equalization, then the Board of Assessment Appeals, district court, or arbitration.

File online: Denver County Assessor online filing

Missed this year's deadline?

If November 15, 2026 has passed, you generally cannot appeal your 2026 value — but next year's window is a fresh start. Watch your mailbox around May for the Notice of Valuation (mailed by May 1) and file early. Meanwhile, make sure you're not overpaying for a simpler reason: check your City and County of Denver exemptions.