SummaryIowa State Fair is happening from 09 August 2018, Thursday to 19 August 2018, Sunday at Iowa State Fairgrounds in Des Moines, IA. The organizer of the event is Iowa State Fair Authority. Iowa State Fair is open to public. The estimated number of attendance is 1,000,000. The estimated number of exhibitors is 600. The frequency of Iowa State Fair is annual. The event has been running since 1854.