The governing law
Colorado is a tax-lien state. Each year the county treasurer holds a public auction of tax liens on parcels whose prior-year taxes are still delinquent, and the auction must commence on or before the second Monday in December. Bidding is premium bid: the lien opens at the taxes, delinquent interest, and fees then due, and it goes to whoever pays the largest amount in excess of that figure. The premium is credited to the county general fund, so it is not part of the investor's return. The certificate earns redemption interest at a single statewide rate that the state bank commissioner resets every September 1, which is 14 percent for the rate year that began October 1, 2025. Three years after the sale the certificate holder may apply for a public auction of a certificate of option for treasurer's deed under Article 11.5, the process that replaced direct deed issuance on July 1, 2024.
C.R.S. Title 39, Article 11
Read the statuteSale of Tax Liens
C.R.S. Title 39, Article 11.5
Read the statuteIssuance of Treasurer's Deeds
C.R.S. Title 39, Article 12
Read the statuteRedemption
C.R.S. 39-10-104.5
Read the statutePayment dates, optional payment dates, failure to pay, delinquency
C.R.S. 39-11-101
Read the statuteNotice to delinquent owner
C.R.S. 39-11-108
Read the statuteManner of conducting public auction
C.R.S. 39-11-109
Read the statuteTime of public auction
C.R.S. 39-11-115
Read the statuteTo whom tax lien shall be sold
C.R.S. 39-11-117
Read the statuteCertificate of purchase
C.R.S. 39-11-119
Read the statuteSubsequent payment by holder
C.R.S. 39-11-122
Read the statuteTransfer of certificates by counties
C.R.S. 39-11-148
Read the statuteLimitations on tax certificates
C.R.S. 39-11-153
Read the statuteInteraction with other law
C.R.S. 39-11.5-102
Read the statuteApplication for public auction
C.R.S. 39-11.5-105
Read the statuteDate of public auction
C.R.S. 39-11.5-108
Read the statuteConduct of public auction and bidding rules
C.R.S. 39-11.5-109
Read the statuteTreatment of an overbid
C.R.S. 39-11.5-116
Read the statutePresentation of certificate of option for treasurer's deed
C.R.S. 39-12-103
Read the statuteRedemption made, interest
C.R.S. 39-12-104
Read the statuteRedemption of real property of person under disability
Want the mechanics in plain English instead of statute numbers? See how to buy in Colorado, the redemption period, and the full Colorado walkthrough.
Statute citations verified Jul 29, 2026. Statutes are amended; always confirm the current text at the official link before you rely on it.
Tax Sale Atlas publishes educational information about public tax sale processes. This is not legal, financial, or investment advice. Rules, dates, and fees change; confirm with the county office before you bid.