CORE System Availability

  • M-F: 6:30 a.m. - 8:00 p.m.
  • Sa-Su: 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 calendar.

CORE Support Center

Need assistance? Contact the CORE Support Center:

Other Contacts



Colorado Vendor Self Service (VSS)

  • 303-866-6464