The St. Charles County Fair Queen Pageant is held annually in conjunction with the St. Charles County Fair. This year’s fair will take place Tuesday, July 28th, 2026 to Saturday, August 1st, 2026, at Rotary Park in Wentzville, MO. Entrants agree to abide by all rules of the St. Charles County Fair Queen Pageant, which are in effect now or as announced later. Entrants agree that the time, manner and method of judging shall be solely at the discretion of the St. Charles County Fair Queen Committee and that the decision of the judges will be final.