06/25/2026
As we wrap up Dairy Month, take a moment to be grateful that you no longer have to illegally smuggle yellow margarine into the Dairy State! From 1895 to 1967, the State of Wisconsin banned the manufacture and sale of yellow margarine (oleomargarine) within state lines as a way to protect the dairy industry. And thus, an oleomargarine black market was born. Not only did roadside oleo stands in border states start popping up to provide for those smuggling back home to Wisconsin, but so did “oleo speakeasies” where you could get your fix from a local hook-up. While the ban has since been reversed, it is still prohibited for restaurants to serve margarine as a substitute for butter (unless specifically requested by the customer) or to serve it to students, patients, or inmates of state institutions.