SummaryEastern Idaho State Fair is happening from 31 August 2018, Friday to 08 September 2018, Saturday at Eastern Idaho State Fairgrounds in Blackfoot, ID. The organizer of the event is Eastern Idaho State Fair. The event is open to public. The estimated number of attendance is 220,000. The estimated number of exhibitors is 200. The frequency of Eastern Idaho State Fair is annual. The event has been running since 1902.