Colo. Rev. Stat. § 13-40-118
In all appeals from the judgment of a county court, in an action founded upon section 13-40-104(1)(d), the defendant, at the time of the filing thereof, shall deposit with the court the amount of rent found due and specified in such judgment. Unless such deposit is made, the appeal is not perfected, and proceedings upon such judgment shall thereupon be had accordingly. If the appeal is perfected, the court shall transmit such deposit to the clerk of the appellate court, with the papers in such case; and the appellant thereafter, at the time when the rents become due as specified in the judgment appealed from and as often as the same become due, shall deposit the amount thereof with the clerk of such appellate court. In case the appellant, at any time during the pendency of such appeal and before final judgment therein, neglects or fails to make any deposit of rent, falling due at the time specified in the judgment appealed from, the court in which such appeal is pending, upon such fact being made to appear and upon motion of the appellee, shall affirm the judgment appealed from with costs; and proceedings thereupon shall be had as in like cases determined upon the merits.
C.R.S. § 13-40-118