Real Property Valuation

In the state of Colorado, real property is reappraised by County Assessors every two years in the odd-numbered years. The data used to establish these values is taken from the 18 to 60 month period prior to June 30 of the even-numbered year preceding the year of reappraisal. In the intervening, or even-numbered year, only property that meets certain criteria, such as new construction or remodel / addition, is revalued. In Summit County, a Notice of Valuation postcard is sent on May 1 to all properties, even though in the intervening year, the value of the property will only have changed if certain criteria are met. Property owners may appeal their values each year from May 1 through June 1. The Assessor’s Office reviews the appeals and sends a Notice of Determination on June 30, which outlines the decision and further appeal rights.

The Summit County Assessor notifies owners of changes to value via an abbreviated Notice of Valuation (NOV) postcard. A long form Notice of Valuation and comparable residential properties can be viewed in the Notice of Valuation Archive. Owners can request to opt out of future abbreviated NOV postcards, to instead receive a long form NOV by contacting the Assessor's Office.

Reappraisal year (2021)


2021 was a reappraisal year. Notices of Valuation were sent on May 3, 2021. Colorado statute requires the Assessor to use data from a minimum period of 18 months prior to June 30, 2018 to determine 2021 and 2022 values. If that data is not sufficient, the Assessor may use additional data, in six month increments, from up to 60 months (5 years) prior to that appraisal date. For most property types in Summit County, the Assessor used 60 months for the 2021 reappraisal. The Assessor is specifically prohibited from considering data from after June 30, 2020.

Intervening year (2022)


2022 is an intervening year. Notices of Valuation were sent on May 2, 2022. The same data collection period that was used for the 2021 Reappraisal year is used to set values in the 2022 Intervening year. Most properties do not change value from a reappraisal year to an intervening year. However, properties with new construction, remodels or additions, change in the use of the land, installation of on-site improvements, or other changes to the property will receive a new value in the intervening year. Additionally, if errors or data corrections were discovered, the property will receive a new value, reflecting those corrections. 



The documents below share information for the current valuation cycle, 2021 and 2022: