Colo. Rev. Stat. § 38-31-201 – Tenancy by the entirety.

(1) No conveyance of real property located in this state executed before or after July 1, 2006, shall create a tenancy by the entirety.
(2) A conveyance of real property located in this state executed before July 1, 2006, that purports to create a tenancy by the entirety shall be presumed to create a joint tenancy.
(3) A conveyance of real property located in this state executed on or after July 1, 2006, that purports to create a tenancy by the entirety shall create a joint tenancy.

Source: L. 2006: Entire article amended, p. 242, § 1, effective July 1.