Colo. Rev. Stat. § 11-105-103
Any state bank or trust company, national banking association, or federal reserve bank may, by brief notation on its front door, fully dispense with, or restrict to such extent as it may determine, the hours within which it will be open for business on all, or less than all, Saturdays. However, the fact that a bank remains open for business on all, or less than all, Saturdays shall not make that day, or any part thereof, a banking day for the purposes of section 4-4-104(a)(3), C.R.S., of the "Uniform Commercial Code". Any plan so adopted by any such organization may be changed by it from time to time in its discretion. Every Saturday on which any such state bank, national banking association, or federal reserve bank, in observance of such notation, is not open for business shall be, with respect to the particular organization, the equivalent of a legal holiday, as specified in section 24-11-101, C.R.S. Any act authorized, required, or permitted to be performed at, by, or with respect to such organization on a Saturday that is for it a holiday may be performed on the next succeeding business day, notwithstanding the provisions of any other law of this state to the contrary, and no liability or loss of right of any kind shall result from such delay. The provisions of this section shall not operate to invalidate or prohibit the doing on any Saturday of any such act by any person or organization referred to in this section.
C.R.S. § 11-105-103
This section is similar to former § 11-6-103 as it existed prior to 2003.