From 13 wineries and just two vineyards a decade ago, to more than 85 state-licensed wineries and more than 413 vineyards covering more than 1,200 acres this year, the Iowa wine industry is growing quickly, due, in part, to the help of Iowa State University. There are vineyards in 95 counties and wineries in 55. The largest concentration is in Warren County, just south of Des Moines -- an area called the "Napa Valley of Iowa" by Iowa State University Extension Viticulturist Mike White.