Colorado property tax appeals, 2027
In Colorado, you appeal a property assessment to the County Assessor, then County Board of Equalization, and the deadline is June 8 for the protest to the assessor. Each county below lists its own date, how to file and who hears the appeal. Sale prices are public record here, so recent sales of similar homes are the main evidence of market value.
Data as of 20 Oct 2026 · 64 counties, state and county recordsHow appeals work in Colorado
| Rule | What applies |
|---|---|
| What you argue | Market value as of June 30 of the year before each odd-numbered reappraisal year (June 30, 2024 for tax years 2025 and 2026), using sales from the data period ending that date (C.R.S. §39-1-104(10.2)) |
| How homes are assessed | For 2026, residential assessed value is 6.8% of actual value after a 10% reduction of the first $700,000 (local government levies, minimum $1,000 assessed) and 7.05% of actual value for school levies, which can be cut by a balancing percentage. Rates change yearly by statute; use the Actual Value on the notice as the market figure.. For 2026, residential assessed value is 6.8% of actual value after a 10% reduction of the first $700,000 (local government levies, minimum $1,000 assessed) and 7.05% of actual value for school levies, which can be cut by a balancing percentage. Rates change yearly by statute; use the Actual Value on the notice as the market figure. |
| Deadline | Protest to the assessor by June 8 (C.R.S. §39-5-122); appeal the Notice of Determination to the County Board of Equalization by July 15, or September 15 in counties on the alternate protest period (§39-8-106). |
| First appeal to | County Assessor (protest), then County Board of Equalization |
| What the notice shows | Market value as “Actual Value”. Mails: By May 1 every year (C.R.S. §39-5-121); in even (intervening) years it may come with the tax bill. Assessed value may not be printed on the notice. |
| Sale prices public | Yes |
| Statutes | Grounds: C.R.S. §39-1-103(5)(a), §39-5-122. Filing: C.R.S. §39-5-122 (protest); §39-8-106 (county board appeal). Assessor’s evidence: C.R.S. §39-5-121.5 (assessor’s valuation data within 7 working days of a written request during the protest); §39-8-107(3) (within 3 working days before the county board hearing). |
More: how to read your notice · what a ratio is · evidence that works · deadlines in every state
Every Colorado county
| County | Deadline | Appeal rate | Lowered | Coverage |
|---|---|---|---|---|
| El Paso County | Not yet published | — | — | Scan from recent sales |
| Denver County | Not yet published | — | — | Scan from recent sales |
| Arapahoe County | Not yet published | — | — | Scan from recent sales |
| Jefferson County | Not yet published | — | — | Scan from recent sales |
| Adams County | Not yet published | — | — | Scan from recent sales |
| Douglas County | Not yet published | — | — | Scan from recent sales |
| Larimer County | Not yet published | — | — | Scan from recent sales |
| Weld County | Not yet published | — | — | Scan from recent sales |
| Boulder County | Not yet published | — | — | Scan from recent sales |
| Pueblo County | Not yet published | — | — | Scan from recent sales |
| Mesa County | Not yet published | — | — | Scan from recent sales |
| Broomfield County | Not yet published | — | — | Scan from recent sales |
| Garfield County | Not yet published | — | — | Scan from recent sales |
| La Plata County | Not yet published | — | — | Scan from recent sales |
| Eagle County | Not yet published | — | — | Scan from recent sales |
| Fremont County | Not yet published | — | — | Scan from recent sales |
| Montrose County | Not yet published | — | — | Scan from recent sales |
| Delta County | Not yet published | — | — | Scan from recent sales |
| Summit County | Not yet published | — | — | Scan from recent sales |
| Morgan County | Not yet published | — | — | Scan from recent sales |
| Elbert County | Not yet published | — | — | Scan from recent sales |
| Montezuma County | Not yet published | — | — | Scan from recent sales |
| Routt County | Not yet published | — | — | Scan from recent sales |
| Teller County | Not yet published | — | — | Scan from recent sales |
| Chaffee County | Not yet published | — | — | Scan from recent sales |
| Logan County | Not yet published | — | — | Scan from recent sales |
| Park County | Not yet published | — | — | Scan from recent sales |
| Otero County | Not yet published | — | — | Scan from recent sales |
| Gunnison County | Not yet published | — | — | Scan from recent sales |
| Alamosa County | Not yet published | — | — | Scan from recent sales |
| Pitkin County | Not yet published | — | — | Scan from recent sales |
| Grand County | Not yet published | — | — | Scan from recent sales |
| Las Animas County | Not yet published | — | — | Scan from recent sales |
| Archuleta County | Not yet published | — | — | Scan from recent sales |
| Moffat County | Not yet published | — | — | Scan from recent sales |
| Prowers County | Not yet published | — | — | Scan from recent sales |
| Rio Grande County | Not yet published | — | — | Scan from recent sales |
| Yuma County | Not yet published | — | — | Scan from recent sales |
| Clear Creek County | Not yet published | — | — | Scan from recent sales |
| San Miguel County | Not yet published | — | — | Scan from recent sales |
| Conejos County | Not yet published | — | — | Scan from recent sales |
| Lake County | Not yet published | — | — | Scan from recent sales |
| Kit Carson County | Not yet published | — | — | Scan from recent sales |
| Huerfano County | Not yet published | — | — | Scan from recent sales |
| Saguache County | Not yet published | — | — | Scan from recent sales |
| Rio Blanco County | Not yet published | — | — | Scan from recent sales |
| Gilpin County | Not yet published | — | — | Scan from recent sales |
| Bent County | Not yet published | — | — | Scan from recent sales |
| Crowley County | Not yet published | — | — | Scan from recent sales |
| Lincoln County | Not yet published | — | — | Scan from recent sales |
| Custer County | Not yet published | — | — | Scan from recent sales |
| Ouray County | Not yet published | — | — | Scan from recent sales |
| Washington County | Not yet published | — | — | Scan from recent sales |
| Phillips County | Not yet published | — | — | Scan from recent sales |
| Costilla County | Not yet published | — | — | Scan from recent sales |
| Baca County | Not yet published | — | — | Scan from recent sales |
| Dolores County | Not yet published | — | — | Scan from recent sales |
| Sedgwick County | Not yet published | — | — | Scan from recent sales |
| Cheyenne County | Not yet published | — | — | Scan from recent sales |
| Kiowa County | Not yet published | — | — | Scan from recent sales |
| Jackson County | Not yet published | — | — | Scan from recent sales |
| Mineral County | Not yet published | — | — | Scan from recent sales |
| San Juan County | Not yet published | — | — | Scan from recent sales |
| Hinsdale County | Not yet published | — | — | Scan from recent sales |
Colorado questions
When is the property tax appeal deadline in Colorado?
Protest to the assessor by June 8 (C.R.S. §39-5-122); appeal the Notice of Determination to the County Board of Equalization by July 15, or September 15 in counties on the alternate protest period (§39-8-106). Counties publish the exact date, and most notices print it.
Who hears a property tax appeal in Colorado?
The County Assessor (protest), then County Board of Equalization hears the first appeal (C.R.S. §39-5-122 (protest); §39-8-106 (county board appeal)).
How is a home assessed in Colorado?
At For 2026, residential assessed value is 6.8% of actual value after a 10% reduction of the first $700,000 (local government levies, minimum $1,000 assessed) and 7.05% of actual value for school levies, which can be cut by a balancing percentage. Rates change yearly by statute; use the Actual Value on the notice as the market figure., valued as of June 30 of the year before each odd-numbered reappraisal year (June 30, 2024 for tax years 2025 and 2026), using sales from the data period ending that date (C.R.S. §39-1-104(10.2)).
What does a Colorado assessment notice show?
The market value, labeled “Actual Value”. Notices mail: By May 1 every year (C.R.S. §39-5-121); in even (intervening) years it may come with the tax bill. Assessed value may not be printed on the notice.
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- Colorado DPT, Understanding Property Taxes in Colorado (2026 rates, data period, protest dates)
- Colorado DPT, Residential Local Government Assessment Rate (2026)
- Colorado DPT, Residential School Assessment Rate (2026)
- Assessors’ Reference Library vol. 2 ch. 5, Taxpayer Administrative Remedies
- Assessors’ Reference Library vol. 2 ch. 9, Form Standards (Real Property Notice of Valuation)
- Jefferson County, Real Property Transfer Declaration Completion Guide
- Each county’s own appeal instructions and notices, read on the date shown on each county page.
- U.S. Census Bureau, county population estimates (2024).