Due to the COVID-19 pandemic, our team has shifted to working remotely.  As a result, we are not able to take initial issue contact via telephone.  Please contact the CORE Help Desk by email at  We appreciate your patience and understanding.    

CORE System Availability

  • CORE Regular System Availability: M-F, 6:30 a.m. - 8:00 p.m.
  • Sat-Sun: 6:30 a.m. - 8:00 p.m. (with the exception of maintenance windows).

CORE Maintenance Schedule and Period Close Dates

On monthly maintenance weekends, the system is down from 8:00 p.m. Friday night to 6:30 a.m. Monday morning.

Are you a Google Calendar user? Click here for instructions on how to add the CORE Calendar to your personal Google calendar.

Are you a Google Calendar user who uses Outlook? Click here for the ICAL link to add to Outlook.

CORE Support Center

Need assistance? Contact the CORE Support Center:

Other Contacts



Colorado Vendor Self Service (VSS)

  • 303-866-6464