Colo. Rev. Stat. § 22-40-106
If a board of education has elected to withdraw all school district moneys from the temporary custody of the county treasurer, and there are no moneys or insufficient moneys to the credit of the proper fund of said school district on deposit with a depositary to pay any warrant or order drawn against said fund, the treasurer of said board shall register said warrant in the same manner as otherwise prescribed for a county treasurer under the provisions of section 22-40-104. Registered warrants shall draw interest from the date of such registration and endorsement at the rate and in the same manner as warrants registered by the county treasurer. The treasurer of said board shall perform all duties required of the county treasurer under section 22-40-104(3) in the registration and payment of school district warrants registered by said treasurer of the board, including publication for notice of payment thereof.
C.R.S. § 22-40-106