Idaho is considered, by some, part of the new frontier of grape-growing areas in the United States. The secret behind Idaho wine: location, location, location. From a purely geographical standpoint, area vintners insist, Idaho offers ideal growing conditions. Vinifera, or wine grapes, actually thrive in this distinctly four-season climate, In addition, the region's summer combination of cold nights and warm days serves to balance grape acids and sugars favorably yielding elegant and graceful wines.