In-N-OutRoot Beer mixed with Vanilla MilkshakeRoot BeerVanilla MilkshakeAsk for a "Root Beer Float". Either that, or order both a Vanilla Milkshake and a Root Beer and mix it up yourself!All Locations4 - Medium$2.10http://hackthemenu.com/chick-fil-a/secret-menu/root-beer-float/The " Root Beer Float " is one of Chick-fil-A's more common "secret menu" items. So, if you can't decide between a dish of vanilla ice cream and a glass of cold root beer then go ahead and have your cake & eat it too as they say at Chick-fil-A. Most fast food places that offer both a soft-serve treat and root beer will mix this one up for you. Be sure to check out the Chick-fil-A Secret Menu as well as visiting our home page to check out the complete list of All the Secret Menus from all your favorite restaurants!