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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 four of Idaho's 23 wineries are located in northern Idaho and its "Panhandle" area, while the balance are mostly concentrated along the Snake River in southwestern Idaho; four 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.
The Snake River Valley will be the name of
Idaho's first appellation if the AVA application
submitted to the US Department of the Treasury's Alcohol and
Tobacco Tax and Trade Bureau (TTB) is approved.
See our 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. 
