The Defiance County Fair serves as a showcase for Defiance County youth participating in 4-H, FFA, Boy Scouts, Girl Scouts and Farm Bureau Youth. Fair provides the opportunity for youth to exhibit the results of their project efforts and to compete for awards and prizes under the Junior Fair Division of the fair. Participation at the county fair is NOT required for completion of a project although it is strongly encouraged for the member as a means of recognition. Exhibiting at the fair IS required in order to receive a premium for projects exhibited.

The Defiance County Junior Fair Board, which is comprised of 4-H, FFA, Boy Scout, Girl Scout and Farm Bureau Youth organization representatives, is the group that helps the Defiance County Agricultural Society in preparing for and putting on the Junior Fair Division activities at the Defiance County Fair. Board member responsibilities include helping at the project judging, making pen assignments, assisting at animal weigh-ins, announcing and recording of Junior Fair Shows, and answering questions of Junior Fair youth and their parents. Members evaluate the past fair and make any necessary Junior Fair program changes with the approval of the Defiance County Senior Fair Board.