The wineries of Michigan specialized in sweet wine and fruit wine well into the 1970s. With the growth in demand, starting in the latter half of the 20th century, for locally grown and locally labeled U.S. fine wines, several existing Michigan makers of sweet wine experimented with upgrading their production, and new vintners entered the scene. Tabor Hill Winery, in southwest Michigan, opened in 1971 as the first Michigan winery specializing in "vinifera" wines. Only a few years later in 1974, Chateau Grand Traverse opened in the Traverse Bay region of Northern Michigan. A slow growth in the number of wineries and continued trials of different "vinifera" varieties continued well into the 2000s. Presently, various hybrid varieties are being looked at which could allow grape growing in the Upper Peninsula to expand significantly over the next several years.