C.R.S. § 40-6-121

When the day for the performance of any act under this title, the effective date of any commission decision or order, the effective date of any administrative law judge’s or commissioner’s recommended decision, or the day upon which any document is required to be filed with the commission falls on any Saturday or Sunday, or on any day when the commission office is lawfully closed, the same shall be continued until 5 p.m. on the first full business day following such Saturday, Sunday, or day of lawful closing.