Colo. Rev. Stat. § 8-44-110
Every insurance carrier authorized to transact business in this state, including Pinnacol Assurance, which insures employers against liability for compensation under the provisions of articles 40 to 47 of this title, shall notify any employer insured by the carrier or Pinnacol Assurance, and any agent or representative of such employer, if applicable, by certified mail of any cancellation of such employer's insurance coverage. Such notice shall be sent at least thirty days prior to the effective date of the cancellation of the insurance. However, if the cancellation is based on one or more of the following reasons, then such notice may be sent less than thirty days prior to the effective date of the cancellation of the insurance: Fraud, material misrepresentation, nonpayment of premium, or any other reason approved by the commissioner of insurance.
C.R.S. § 8-44-110
This section is similar to former § 8-44-114 as it existed prior to 1990.