Colo. Rev. Stat. § 11-42-117
Each association may, at its option, prescribe a period or periods of notice of intention to withdraw. The period of any such notice of intention to withdraw shall not exceed sixty days. All notices of intention to withdraw shall be set forth and be a part of the bylaws of the association. All periods of notice of intention to withdraw shall be disclosed to members at the time of opening an account and shall appear on the shares as described in section 11-42-101. Each association may prescribe by its bylaws the terms and conditions of withdrawal which are not contrary to the provisions of articles 40 to 46 of this title. The shares shall state that the right of withdrawal is subject to the provisions of articles 40 to 46 of this title. This section shall not apply to tax and loan accounts, note accounts, or similar accounts when, subject to the regulations of the United States treasury, the association is serving as a depository for federal taxes or as a treasury tax and loan depository.
C.R.S. § 11-42-117