As the concern over COVID-19 increases, our employees are self-quarantining in order to protect each other in the workplace. Please contact the CORE Help Desk by email at as our team temporarily transitions to deliver support remotely. At this time, we are not able to take initial issue contact via telephone.  We appreciate your patience and understanding.   

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