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Fennville is an American Viticultural Area (AVA) located in Allegan County, with a small portion in Van Buren County in southwestern Michigan. The wine appellation was established as the nation's fourth and Michigan's initial AVA on September 18, 1981, by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by William Welsch, President of Fenn Valley Vineyards, on behalf of local vintners, proposing the viticultural area to be named "Fennville."
The boundaries of the viticultural area, using landmarks and points of reference are as follows: starting at the most southwestern point, the intersection of the Black River as it empties into Lake Michigan at the city of South Haven; northward along the eastern shore of Lake Michigan approximately to the intersection of the Kalamazoo River;, easterly along the course of the Kalamazoo River for approximately , due east to 86°5' west longitude which is east of the community of New Richmond; south along 86°5' west longitude for to the intersection of the Middle Fork of the Black River;, westerly along the course of the twisting Middle Fork of the Black River until it joins the Black River, continuing west for a total of ( due west) to the starting point. It lies within the region specifically been known by two names, "Fruit Belt" and "Lake Michigan Shore", while also generally referred to as "Southwestern Michigan" or "Western Counties".
The soil in the Fennville area is different from surrounding areas, primarily glacier soils. The area's climate is moderated by the nearby Lake Michigan, and few days in the summer growing season exceed . Grape growers in the area have had success with both Vitis vinifera and Vitis labrusca wine grapes. The hardiness zone range is 6a to 7a. In 1983, Fennville viticultural area became a sub-appellation encompassed within the Lake Michigan Shore.
In 1973, William Welsch bought an old, abused fruit farm with diseased orchards and junk yard. After removing the trees and building up the soil, the property was converted into Fenn Valley Vineyards. At the outset, there were seven of these original 27 farms growing grapes commercially. Proprietors of two wineries, one located in the proposed area and one located south, gave testimony as to the differences in character and taste of the same type of grapes grown in the two areas. After evaluating the testimony presented and the written comments, ATF determined the historical and current evidence supports the name of the viticultural area as being a distinct grape-growing region.
The entire area receives the tempering lake effect of Lake Michigan. Its climate is distinguished from the surrounding area by a more moderate high and low temperature range attributed to its proximity to Lake Michigan and the protecting sand dunes. This lake effect moderates the winter and summer temperature extremes, and delays budding of the vines beyond the late spring frosts. The lake effect also causes generally uniform climatic conditions, since large bodies of water retain heat and cold and react slower to temperature fluctuations. The number of frost-free growing days in this area ranges from 155 to 175 days, normally during the period of May 10 through October 13. The higher elevations of the Fennville area have been producing fruit since the mid 1800's, including peaches, apples, pears, plums, cherries, and grapes. Proximity to Lake Michigan moderates both winter and summer temperatures by as much as . Thus, winter minimums seldom are registered below and summer maximums seldom above . Higher winter minimums permit the winter survival of most suitable wine grape varieties; lower summer maximums prevent the sun burnt grape flavors from developing here.<
The area generally consists of sandy loam soil and rolling terrain which is well drained and ideal for growing peaches, apples, cherries, plums, pears, and grapes, especially winegrapes.
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