The O'Fallon Brewery was founded by Fran and Tony Caradonna, in 2000. In January they ordered their brewing equipment and sold their first keg on May 6, 2000. The Caradonnas did all the brewing and selling for the first two years, brewing only one style (O'Fallon Gold), selling only kegs and delivering only in St. Charles County. Over the next several years they continued to grow their brands and distribution area. In May 2011 they sold the brewery to Jim Gorczyca, but Fran continues to play a part of day to day operations as the Brewery's General Manager.