MASON CITY, Iowa. (KTTC) – The Greater Mason City Chamber of Commerce is kicking off its agriculture industry tours, Tuesday. This year’s event will feature three mini tours, creating more opportunities for people to see behind-the-scenes operations, innovations, and technology that explore the diverse agriculture industry businesses driving north Iowa’s economy. Tour list and dates: Golden Grain Energy - Tuesday, June 23, 2026, | 2-4 p.m. 1822 43rd St SW, Mason City.