Colo. Rev. Stat. § 39-20-102
In any case where there has been a refusal or neglect to pay any tax due the state of Colorado and a statement or notice has been filed which, under law, creates a lien upon any real property for such tax, the executive director of the department of revenue may cause a civil action to be filed in the district court of the county in which is situated any real property which is subject to said lien to enforce the lien of the state of Colorado for such tax upon the real property situated in that county or in any other county in the state which may be subject to such lien or to subject any real property or any right, title, or interest in real property to the payment of such tax. The court shall adjudicate all matters involved in such action and may decree a sale of the real property and distribute the proceeds of such sale according to the findings of the court in respect to the interest of the parties and of the state of Colorado. The proceedings in such action and the manner of sale, the period for and manner of redemption from such sale, and the execution of a deed of conveyance shall be in accordance with the law and practice relating to foreclosures of mortgages upon real property. In any such action, the court may appoint a receiver of the real property involved in such action if equity so requires.
C.R.S. § 39-20-102
For foreclosure of mortgages and redemption procedures, see articles 38, 39, and 40 of title 38; for appointment and qualification of receivers, see C.R.C.P. 66.