C.R.S. § 42-3-114: Expiration.

Every vehicle registration under this article shall expire on the last day of the month at the end of each twelve-month registration period and shall be renewed, upon application by the owner, the payment of the fees required by law, and in accordance with section 42-3-113 (3), not later than the last day of the month following the date of expiration. No license plates other than those of the registration period to which they pertain shall be displayed on a motor vehicle operated on the highways of Colorado. A person who violates any provision of this section commits a class B traffic infraction.