C.R.S. § 16-2-109: Service of summons.

A summons issued by the county court in a prosecution for a misdemeanor or petty offense may be served by giving a copy to the defendant personally or by leaving a copy at the defendant's usual place of abode with some person over the age of eighteen years residing therein or by mailing a copy to the defendant's last-known address by certified mail, return receipt requested, not less than fourteen days prior to the time the defendant is required to appear. Service by mail must be complete upon the return of the receipt signed by the defendant. Personal service must be made by any disinterested party over the age of eighteen years.