Columbia Valley
Encompassing more than a quarter of the state, the Columbia Valley AVA is by far Washington’s largest growing region at 11+ million acres. It is home to over 99% of all of Washington’s vinifera acreage.
Fast Facts:
Location: Central, south-central, and south-eastern Washington and north-central Oregon | Established: 1984 | Total Size: 11 million acres | Acreage under vine: 60,079 total acres, 59,234 in WA | Top Varieties: Cabernet Sauvignon, Chardonnay, Merlot, Riesling, Syrah | Soils: Loess overlying gravel and slackwater sediment with a basalt bedrock | Average Annual Precipitation: 6-8 inches.
Read more at https://www.washingtonwine.org/resource/columbia-valley-ava/