Ribera del Duero D.O. After being granted D.O. in 1982, an explosion of development occurred shifting production from inexpensive rose to top quality red wine. Climate: The majority of plantings are sited within the valley and thus protected from extreme weather. Due to the high altitude, 2,300 to 2,750 feet, nighttime temperatures are much lower than daytime temperatures allowing grapes to maintain essential natural acidity. Soil: The main growing area is made up of the high plains, steep slopes, shallow slopes and river banks. Grape Varities: Tinta del Pais, the local clone of Tempranillo, makes up 85% of plantings in Ribera del Duero. While Cabernet Sauvignon, Merlot and Malbec are allowed grapes in the blend, they are not permitted to be planted in new vineyards.