When Is The Illinois State Fair 2025. The illinois state fair is an annual festival, centering on the theme of agriculture, hosted by the u.s. The 2025 illinois state fair is scheduled for august 7 through august 17 in springfield.

Just inside the main gate you will find the iconic giant slide. More information on the fair, including other grandstand acts, will be announced on its social media profiles and its website in the coming months.