Clay County Fair

Spencer, IA · Festival

When: September 12–20, 2026
Where: Clay County Fairgrounds · Spencer · IA
Cost: Not confirmed
Status: Confirmed from the organizer's published schedule

Known since 1917 as the World's Greatest County Fair, the Clay County Fair fills its Spencer fairgrounds for nine days each September with livestock competitions, a demolition derby, national touring acts and a midway. It draws roughly 300,000 visitors, making it Iowa's largest county fair and one of the largest in the country.

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