Colorado Property Tax Objection — 2026 Guide

How to File an objection Your Property Tax Assessment in Colorado

The general objection process in Colorado:

1. Meet the deadline: File a written objection and protest with the county assessor by June 8 (real property) — the notice/objection must be delivered, postmarked, or given in person no later than June 8 of the reappraisal year (Colo. Rev. Stat. §39-5-122(2) and §39-5-121(1)(a)(I)). The assessor must conclude all objection hearings by June 8 and mail its decision (Notice of Determination, Form 39-8-106) on or before the last regular working day of the assessor in June. If the objection is denied in whole or in part, the property owner may then petition the County Board of Equalization (CBOE); for real property the petition must be received or postmarked on or before July 15 (Colo. Rev. Stat. §39-8-106(1)(a)). NOTE: Counties that have adopted the optional alternate protest and appeal procedure under §39-5-122.7 use later deadlines — the assessor mails its decision on or before August 15, and the CBOE petition deadline is September 15 for both real and personal property. Personal-property objection deadline is June 30.
2. File a objection: Contact your county's CBOE or file online through your county's online portal.
3. Gather evidence: Market analysis, recent comparable sales, and documentation of property defects or errors.
4. Attend your hearing: Present your evidence to the County Board of Equalization.
5. Escalate if needed: After the initial hearing, consider County Board of Equalization (CBOE) — petition filed if the assessor denies the objection; received or postmarked on or before July 15 for real property (September 15 in alternate-procedure counties under §39-5-122.7); the CBOE concludes hearings and renders decisions by August 5 (Colo. Rev. Stat. §§39-8-106, 39-8-107).