when is the dallas state fair
â¢ Where: Fair Park, Dallas. â¢ When: Friday, September 30 to Sunday, October 23, 2016. â¢ Directions: Interstate 30 East or West, then follow signs to Fair Park. The State Fair of Texas is the big end-of-summer event that takes place in Dallas each year. It is the largest state fair by total attendance in the United States, with an estimated three million or more people attending annually.