Southern Wisconsin has a number of wineries and I'm sure I didn't list all of them:
Cedar Creek (owned by Wollersheim)
A new one in Mt. Horeb or New Glarus...just saw a newspaper ad for it. Wollersheim
is the one we're most familiar with. They make reds and whites from grapes both grown on the premises and imported, and our favorites are the White Riesling, Port, and Ice Wine.