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Idaho's
vineyard elevations (ranging up to 3,000 feet) are higher than any
others in the Northwest. Vineyard soils are comprised of primarily
volcanic-ash. Only five of Idaho's more than 30 wineries are located in northern Idaho and its "Panhandle" area; most of the others are concentrated along the Snake River in southwestern Idaho; a few are clustered in the eastern part of the Snake River Valley between Mountain Home and Twin Falls, and two are north of Twin Falls off of Hwy 93 in Ketchum near Sun Valley. Even so, another dozen or so Washington wineries are within minutes of Idaho's western border.
The Snake River Valley is
Idaho's first appellation authorized by the US Department of the Treasury's Alcohol and
Tobacco Tax and Trade Bureau (TTB)
See our archived feature article:
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Add to that long, warm daylight hours during grape growing season
(typical of northern latitudes and arid climates), cool summer evenings
characteristic of desert environments, and you have a combination of
factors that contributes to producing quality wine grapes with concentrated fruit flavors and
naturally high acidities. 
