Where are the highest vineyards in the U.S.?

D.

Colorado’s 125 wineries are mostly nestled in high-elevation river valleys and on mesas—many of which are at elevations of 4,000 to 7,000 feet above sea level, making the Rocky Mountain state’s vineyards the highest in the U.S. Colorado’s vineyards are also considered some of the highest in the world. At such elevations, nights are cold, but during summer, days are warm, dry, and sunny.