Fair officials said Governor J.B. Pritzker's decision to delay the Bridge Phase of reopening led to the decision.
The fair was originally scheduled for July 21-25.
As of now, officials said they are exploring the possibility of holding a similar event in the fall. They also said they are working with University of Illinois Extension - DuPage County to create an opportunity for 4-H members to show their projects and animals.
Participating 4-H members can earn a spot to participate in the State competitions at the Illinois State Fair scheduled for August 12-22.
The DuPage County Fair has been a local tradition for over 180 years and is a source of livelihood for many people and businesses, officials said.
The fairground is also currently being utilized as a mass vaccination site for the county. It is open six days a week by appointment only,