Colorado Department of Corrections is in the process of transitioning to a new visiting records system; as a component of this transition, all visitors whose most recent application is over a year old must reapply and undergo a new background check for safety and security purposes and to bring all visiting records into compliance with policy requirements concerning visitor approval.
Per policy as covered in Administrative Regulation 300-01 Offender Visiting Program, page 5:
Any applicant who has not been approved or whose application is over a year old must re-submit a new application for review and processing. [IV. B. 1. a.]
This administrative regulation may be accessed on our department policies page at https://cdoc.colorado.gov/about/department-policies. Visiting applications may be accessed at https://cdoc.colorado.gov/resources/visitation/visiting-applications. Visiting applications must be submitted per the facility-specific visiting instructions as listed under the "Where/how to submit visiting applications" section on the page for the facility you are applying to visit. Facility-specific pages may be found at https://cdoc.colorado.gov/facilities.