Colorado County Fair 2025. The fair begins on thursday, september 7, and runs through saturday, september 16. Arapahoe county fairgrounds & park the arapahoe county fairgrounds offers sweeping mountain views of the colorado front range all while your feet stand in the open prairie of the eastern plains.
Colorado county fair is a good old fashioned county fair located in beautiful columbus. The boulder county fair is the oldest fair in colorado celebrating its 155th year.
