Jefferson County Property Tax Objection Guide
In Jefferson County, file your objection by June 8, 2026 at Jefferson County Assessor's online portal.
| 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. |
|---|---|
| Lien date | January 1, 2026 |
| Objection body | County Board of Equalization (CBOE) |
| Assessor / district | Jefferson County Assessor |
| Online portal | File online |
How to File a File an objection in Jefferson County
- Gather your assessment notice — it lists your account number and any access code
- File online through Jefferson County Assessor's portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal CBOE hearing