Colo. Rev. Stat. § 35-55-103
No person shall engage in the operation of a public livestock market within the state of Colorado without first procuring a license from the state board of stock inspection commissioners and paying a fee prescribed by the board in an amount sufficient to cover the administrative costs of the licensing provisions of this article. The license may be renewed by eligible applicants in accordance with an expiration and renewal schedule established in rules promulgated by the commissioner of agriculture. An application for a license to establish and operate public livestock markets shall be in writing upon a blank form to be furnished by the board and shall be accompanied by the fee prescribed by the board pursuant to this section. If the board does not issue a license or renewal, the fee must be returned to the applicant.
C.R.S. § 35-55-103