The Assessor strives to provide the citizens and taxpayers of Rio Blanco County with an assessment process that ensures fair and equitable valuations of all properties within the county's boundaries, and to ensure that all properties are valued in accordance with the laws that govern the Assessor's Office.

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Colorado law 39-1-104 (10.2) (a) C.R.S. requires a two-year reassessment cycle for all taxable real property. The Assessor mails a Notice of Value (NOV) by May 1st of every odd numbered year. The Notice of Value will describe the property you own and give the value used for the next year’s taxes. You have the right to appeal your value each year regardless of value changes. The Assessor’s Office hears appeals on real property valuations in May of each year. In an intervening year (even numbered year) only those properties with a change of 75% in actual value will receive a Notice of Value.

Important Date and Assessor Actions

Date Action
12/10 Recertification of taxable values sent to taxing districts
1/1 Assessment date for all property in Colorado
1/10 Assessor delivers the prior year tax warrant to County Treasurer
ASAP Post-Jan. 10, Assessor mails Oil & Gas, Drilling Rig, Producing Natural Resources and Personal Property declarations to owners/operators.
4/15 Personal Property declaration schedules are due.
5/1 Assessor mails Notice of Valuation (intervening years; 2026 notices are mailed only if the property's actual value increased by 75% or more from 2025).
5/1 Real Property Protests begin.
6/8 Real Property Protests end.
6/15 Personal Property Protests begin.
6/30 Assessor mails Notice of Determination for Real Property.
6/30 Appraisal date of every even year.
7/1 CBOE hearings begin for both Real and Personal Property.
7/1 Personal Property Protests end.
7/10 Assessor mails Notice of Determination for Personal Property.

Recent Legislation: HB24B-1001

Property tax revenue limit. Senate Bill 24-233, concerning property tax, created a limit on the annual growth of specified property tax revenue for certain local governments, excluding school districts. Sections 3 through 7 modify that property tax limit and establish a new limit for school districts.
View the bill summary