I was today years old when I found out about this weird Wisconsin drinking rule. A Strange Wisconsin Alcohol Law That Stops You Mid-ScrollApparently, even with Wisconsin's legal drinking age of 21, people under 21 can legally drink at a bar or restaurant as long as they're accompanied by a parent, guardian, or spouse of legal drinking age. Yes, Minors Can Legally Drink in Wisconsin Under One ConditionThere is a catch, though, the bar or restaurant can refuse service because, while I guess it's legal, it's not mandatory. Wisconsin isn't alone, though, when it comes to minors and booze. LOOK: Breweries with the most highly ranked beers in Illinois Stacker compiled a list of the breweries with the most highly ranked beers Illinois from BeerAdvocate.