The area's wine production is centered around the valleys of Rio Negro and Rio Colorado. The length of the frost-free season is particularly good for short term growing wine types. There's also a very important production of sparkling wines. A considerable number of wineries produce wines to be exported, mainly to North American and European markets. The Middle and Low Valleys of Rio Negro are also good growing areas.
Climate conditions change towards the East, due to the increase in rainfall .
Other important wine areas in Patagonia are the Upper and Middle Valleys of the Colorado river. The Upper Valley is about to become the third Argentine region to comply with this law. The CNO is granted only to superb wines produced under special conditions using high quality grapes, in accordance with norms and specifications exclusive of certain geographical areas. The Upper Valley possesses the natural and production characteristics to deserve such an award.