NATIONAL STEWART’S ROOT BEER DAYOts looks pretty and cool at glass For many years now, June 17th has the distinction of being National Stewart’s Root Beer Day. Celebrating this holiday each year is easy, just gather some friends and some of Stewart’s Root Beer and enjoy! Originating in 1924 in Mansfield, Ohio, Stewart’s Fountain Classics were a brand of old-fashioned fountain sodas. They are a brand of premium soft drinks made in the United States. Founded by Frank Stewart, he set up his first drive-in root beer stand to supplement his income as a school teacher.Commercial root beer production in the United States has been around since 1875. Producers traditionally use molasses and elements of sassafras as the main ingredients .Today over 100 brands are produced in different flavours .