Colo. Rev. Stat. § 24-70-108
In all cases and proceedings brought in courts of record in this state and in foreclosure proceedings through the public trustee wherein the law requires the publication of a legal notice or advertisement or said legal notice or advertisement is published by order of the court in compliance with the law or rules of procedure of such court, the party upon whose motion or application or the beneficiary under the deed of trust or the legal holder of an indebtedness secured by a deed of trust shall have the right to designate the newspaper in which such legal notice or advertisement shall be published. Said newspaper shall be a legal newspaper as defined by law and shall be published in the county where such publication is required to be made by law or by the rules of civil procedure or rules of the court applicable thereto.
C.R.S. § 24-70-108