SummaryOregon State Fair is happening from 24 August 2018, Friday to 03 September 2018, Monday at Oregon State Expo Center in Salem, OR. The organizer of the event is Oregon State Fair. The event is open to public. The estimated number of attendance is 250,000. The estimated number of exhibitors is 500. The frequency of Oregon State Fair is annual. The event has been running since 1862.