Sometime in this era, the idea of holding a county fair replaced the district plan.

Originally, the 13th District Agricultural Association comprised Yuba, Sutter, Yolo and Sacramento counties.

In the early 1930s, a group of interested citizens established a rodeo arena at the Flying I Ranch in the Arboga District.

Later it was deemed advisable to obtain a site more centrally located and convenient to the residents of Marysville and Yuba City.

Additional adjacent land was purchased and the fair has been held annually since 1945, although the severe flood of 1955 curtailed operations that year.