The Biggest Fairs in Iowa

One of the largest and oldest state fairs in the country, the Iowa State Fair draws over a million visitors annually to the Des Moines fairgrounds for an 11-day run each August. It set an all-time attendance record in 2024, then posted its third-highest total ever in 2025 despite hotter, wetter weather — famous for its butter cow sculpture and a food lineup on a stick that draws national media coverage every summer.

Branded "The World's Greatest County Fair" since 1917, the Clay County Fair in Spencer is widely recognized as one of the largest county fairs in the United States, not just Iowa. It runs nine days each September and hosts the largest agricultural machinery and equipment exposition of any fair in the country, alongside a full carnival midway and grandstand concert lineup.

Marketed as "The Best Five Days of Summer," the Plymouth County Fair is consistently cited as one of the largest county fairs in Iowa, with attendance holding in the six-figure range every year. Friday is traditionally the biggest single day, drawing roughly 30,000 visitors on its own.

The Dubuque County Fair draws attendees from across the tri-state Dubuque region each July. Recent years show attendance softening somewhat — officials cited hot weather and the elimination of paid grandstand concerts in favor of free admission events as factors in a 2025 decline — but organizers say turnout remains a solid regional draw.

Originally founded in 1889 as the Wapsie Valley Fair, the Linn County Fair has grown substantially from its early 20th-century crowds of around 7,000. Held in Central City, it centers heavily on 4-H and FFA youth programming, offers free parking to attendees, and rebuilt its carnival midway in 2006 after a 40-year gap.