Geography and Climate
The soils of the Walla Walla Valley consist largely of wind-deposited silt known as loess, that provides good drainage for the vines. The area receives minimum rainfall and thus relies on irrigation to supply water to vineyards. The 200-day long growing season is characterized by hot days and cool nights. The valley is prone to sudden shifts in temperature as cold air swoops down from the Blue Mountains and gets caught in the Snake and Columbia river valleys. While generally cooler than the surrounding Columbia Valley AVA, temperatures in the winter time can drop to −20 °F (−29 °C).
The southern part of Walla Walla Valley extends into the state of Oregon and is one of the warmer wine growing regions in that state, after the Rogue Valley. Syrah is a major planting in this area.
Read more about this topic: Walla Walla Valley AVA
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