Columbia Valley AVA

The Columbia Valley's vineyard land was shaped by fire and ice: volcanic activity made the bedrock, and colossal ice age floods gave the vineyards their soil. Millions of years ago, fissures in the earth poured out massive volumes of basalt, a dark, fine-grained volcanic rock. The Pacific Northwest is home to one of the largest basalt provinces anywhere on earth, covering much of eastern Washington, northern Oregon and western Idaho. The basalt can be thousands of feet thick, so heavy that some areas of the Columbia Basin sit below sea level, creating a low desert. At the end of the last Ice Age, approximately 15,000 years ago, a lobe of the Cordilleran ice sheet blocked a river in Idaho and created Glacial Lake Missoula in what is now western Montana, behind an ice dam 1,200 feet high. When the dam broke, water raced across the Columbia Valley in waves over 400 feet high moving at 60 miles per hour. At the Wallula Gap, a pinch in the earth, the floodwaters backed up and drained slowly, so heavier soils dropped out first and lighter soils after. The floods happened a number of times over thousands of years and are known together as the Missoula Floods; they left a layer of silt, sand and gravel on top of the basalt. After the floods ended, winds carried fine sand and silt across the Columbia Basin and laid it down as loess, in some places with layers of volcanic ash. Below 1,200 feet above sea level, the Columbia Valley has loess of varying thickness on top of Missoula Flood deposits and slackwater sediment, on top of basalt bedrock. Loess holds little water, which suits irrigated vineyards, but it would blow away over time without cover, which is why most eastern Washington vineyards have cover crops. Many growing regions also sit on the Yakima Fold Belt, wrinkles in the earth whose anticlines give south-facing slopes ideal for wine grapes; Rattlesnake Hills, Red Mountain, Candy Mountain, Royal Slope and Horse Heaven Hills are among them.

• Basalt bedrock: part of one of the largest basalt provinces anywhere on earth, thousands of feet thick in places
• Missoula Floods: began at the end of the last Ice Age, approximately 15,000 years ago, and recurred a number of times over thousands of years; waves over 400 feet high moving at 60 miles per hour
• Flood deposits: silt, sand and gravel (Missoula Flood deposits and slackwater sediments) on top of the basalt
• Loess: windblown sand and silt on top of the flood deposits; low water-holding capacity, so most eastern Washington vineyards have cover crops

The Columbia Valley lies wholly east of the Cascade Mountains, in their rain shadow. Two mountain ranges, the Olympics and the Cascades, protect it from wet weather systems, leaving a low desert with an arid and semi-arid, continental climate. The Columbia Valley averages 6 to 8 inches of rain a year, and Red Mountain and Beverly, Washington each average 5 inches. Irrigation is therefore required in most places to grow wine grapes. The water comes from the Columbia River, the fourth largest river by volume in the United States, along with its tributaries and local aquifers. Irrigation, together with consistently warm, dry temperatures during the growing season, gives growers a high amount of control over grape development. Washington shares the 46th parallel latitude with some of the top wine regions in Europe, and its growing season sees up to 17 hours of sunlight a day in summer, about one more hour at the peak of the growing season than California's prime growing region. Summer days are hot, but the gap between daytime high and nighttime low is given as 35 to as much as 47 degrees Fahrenheit on the Washington State Wine Commission's Grapes, Soil & Sun page and as 30 to 40 degrees Fahrenheit on its fast-facts page, and Columbia Valley temperatures cool down rapidly at harvest. Long, warm days give ripe fruit flavors, while the cool nights and rapid cooling at harvest help preserve natural acidity. Winter cold can damage vines: an unusually harsh winter severely reduced the 1996 crop, which came in at 34,000 tons; a late 2010 freeze damaged some vines in the Horse Heaven Hills and Walla Walla AVAs; and an extreme cold event in January 2024 threatened that vintage, though the vines proved resilient and gave a near-normal crop. For contrast, Puget Sound, Washington's only appellation west of the Cascade crest, has a maritime climate and gets enough rainfall to grow grapes without irrigation.

• Rain shadow of the Olympics and the Cascades: arid and semi-arid, continental low desert; 6 to 8 inches of rain a year on average
• Irrigation required in most places, drawn from the Columbia River, its tributaries and local aquifers
• Up to 17 hours of summer sunlight a day; a day-night swing that the Washington State Wine Commission's Grapes, Soil & Sun page puts at 35 to as much as 47 degrees F (its fast-facts page gives 30 to 40 degrees F); rapid cooling at harvest
• Winter freezes: a harsh 1996 winter (34,000-ton harvest), a late 2010 freeze in the Horse Heaven Hills and Walla Walla, an extreme cold event in January 2024

The Columbia Valley was established as a federally approved AVA in 1984. Encompassing more than a quarter of the state, it is by far Washington's largest growing region: about 11 million acres in total, of which about 8.7 million are in Washington, with the rest in north-central Oregon. Its boundary takes in 17 Washington counties and five Oregon counties, and it is one of three AVAs that cross into Oregon. The valley takes its name from the Columbia River, itself named after Captain Robert Gray's ship, the Columbia Rediviva, the first to travel up the river in 1792. The Columbia Valley AVA holds over 99 percent of Washington's vinifera acreage. Washington has 22 AVAs, and almost all of them are sub-appellations of the Columbia Valley: 18 Washington AVAs sit inside the Columbia Valley (19 counting The Rocks District, which is in Oregon). The exceptions are Puget Sound, Columbia Gorge and Lewis-Clark Valley. Yakima Valley (1983) was Washington's first AVA and is home to over one quarter of the state's grapevine acreage; it is one of the few areas of Washington with more white grapevines planted than red. Five AVAs sit inside Yakima Valley as well as the Columbia Valley: Red Mountain (2001), Rattlesnake Hills (2006), Snipes Mountain (2009), Candy Mountain (2020) and Goose Gap (2021). Red Mountain is one of Washington's warmest and driest appellations, with Cabernet Sauvignon making up 60 percent of plantings, and Snipes Mountain, where vineyards were first planted in 1914, is home to some of the state's oldest grapevines. Candy Mountain, four miles southeast of Red Mountain, is Washington's smallest AVA, about 815 acres (Washington State Wine Commission). Walla Walla Valley (1984) is shared with Oregon: it lies in Walla Walla County, Washington, and Umatilla County, Oregon, entirely within the Columbia Valley, and has the highest concentration of wineries in the state. Inside it lies The Rocks District of Milton-Freewater, an Oregon AVA in Umatilla County established in 2015. The other Columbia Valley sub-AVAs are Horse Heaven Hills (2005), home to over one quarter of Washington's planted acreage; Wahluke Slope (2006), a warm, dry alluvial fan; Lake Chelan (2009), with a granitic bedrock and a lake that moderates summer and winter temperatures; Naches Heights (2011); Ancient Lakes of Columbia Valley (2012), one of the few Washington appellations dominated by white varieties, specifically Riesling; Royal Slope (2020); The Burn of Columbia Valley and White Bluffs (both 2021); Rocky Reach (2022); Beverly, Washington (2024); and Columbia Hills (2026), the newest. Among the youngest, Goose Gap (8,129 acres) stands apart for a ridge crest that runs east-west; White Bluffs (93,738 acres) spans two plateaus that rise an average of 200 feet above the plains of the Pasco Basin, which protects the vines from cold air on the valley floor; The Burn of Columbia Valley (16,870 acres) gets slightly more precipitation than other Columbia Valley regions and persistent winds coming up the Gorge; Beverly, Washington (2,415 acres) accumulates approximately 3,500 growing degree days, making it one of the warmest appellations in the state; and Columbia Hills (29,387 acres) had about 300 acres of wine grapes in 2026.

• Columbia Valley: established 1984; 11,308,636 acres in total, 8,748,949 of them in Washington; one of four cross-border Washington AVAs
• Inside Yakima Valley (1983, Washington's first AVA): Red Mountain (2001), Rattlesnake Hills (2006), Snipes Mountain (2009), Candy Mountain (2020, Washington's smallest AVA at about 815 acres), Goose Gap (2021)
• Walla Walla Valley (1984): shared with Oregon, with the highest concentration of wineries in the state; contains The Rocks District of Milton-Freewater (Oregon, 2015)
• Other sub-AVAs: Horse Heaven Hills (2005), Wahluke Slope (2006), Lake Chelan (2009), Naches Heights (2011), Ancient Lakes of Columbia Valley (2012), Royal Slope (2020), The Burn of Columbia Valley (2021), White Bluffs (2021), Rocky Reach (2022), Beverly, Washington (2024), Columbia Hills (2026)

Washington cannot be defined by a single grape variety or even a group of grapes. More than 80 varieties are planted in the state, but Cabernet Sauvignon, Chardonnay, Merlot, Riesling and Syrah make up over 80 percent of production each year, and those five are the Columbia Valley's top varieties. Cabernet Sauvignon was first planted in Washington in 1941. Cabernet production exceeded Merlot production for the first time in 2006, and in 2013 Cabernet became Washington's most produced grape variety, surpassing Riesling and Chardonnay. Its largest concentrations are in the Horse Heaven Hills, Wahluke Slope and Yakima Valley, and it makes up 60 percent of plantings on Red Mountain. The Washington State Wine Commission's AVA chart lists Cabernet Sauvignon (46%) as a main variety of Wahluke Slope, Cabernet Sauvignon (42%) in the Horse Heaven Hills and Cabernet Sauvignon (36%) in Walla Walla Valley. The first vineyard on Red Mountain was planted in 1975, and Col Solare, a partnership between Chateau Ste. Michelle and Marchese Piero Antinori on Red Mountain, released its first vintage in 1995. Quilceda Creek, founded by Alex Golitzin in 1979, has bought a 17-acre vineyard on Red Mountain. In Walla Walla Valley, Leonetti Cellar planted Cabernet Sauvignon in 1974; Woodward Canyon was founded in 1981 by Rick and Darcey Small; and L'Ecole No. 41, founded in 1983 by Jean and Baker Ferguson, says it was the third winery established in the Walla Walla Valley. Syrah was first planted in the state in 1986, at Red Willow Vineyard in Yakima Valley. In 1997 Cayuse Vineyards planted the first modern-day vineyard in what became The Rocks District of Milton-Freewater; Cayuse is Christophe Baron's domaine in the Stones of the Walla Walla Valley, farmed with biodynamic methods. Riesling was first planted in Washington in 1961 and is concentrated in Yakima Valley and Ancient Lakes. Decanter reports that Washington grows more Riesling than any other state and calls Chateau Ste. Michelle one of the largest producers of Riesling in the world. In 1999 Chateau Ste. Michelle partnered with Ernst Loosen of Germany's Dr. Loosen to make the first vintage of Eroica Riesling. Chardonnay was first planted in Washington in 1964 and Merlot in 1965; both are concentrated in Yakima Valley, the Horse Heaven Hills and Wahluke Slope.

• Cabernet Sauvignon: first planted in 1941; out-produced Merlot for the first time in 2006; became Washington's most produced variety in 2013; 60 percent of Red Mountain plantings
• Merlot (first planted in 1965) and Chardonnay (1964): largest concentrations in Yakima Valley, the Horse Heaven Hills and Wahluke Slope
• Syrah: first planted in 1986 at Red Willow Vineyard, Yakima Valley; Cayuse Vineyards planted the first modern-day vineyard in what became The Rocks District in 1997
• Riesling: first planted in 1961; concentrated in Yakima Valley and Ancient Lakes; Eroica, Chateau Ste. Michelle's partnership with Ernst Loosen, first made in 1999

Primary sources: https://www.washingtonwine.org/fast-facts/, https://www.washingtonwine.org/regions-and-avas/, https://www.washingtonwine.org/press_release/columbia-hills-is-washingtons-22nd-american-viticultural-area/, https://www.washingtonwine.org/history/, https://www.washingtonwine.org/grapes-soil-sun/, https://www.washingtonwine.org/resource/columbia-valley-ava/, https://www.washingtonwine.org/wp-content/uploads/2021/05/WA-AVAs-22-2.xlsx, https://www.washingtonwine.org/resource/candy-mountain-ava/, https://www.washingtonwine.org/resource/beverly-washington-ava/, https://www.washingtonwine.org/resource/red-mountain/, https://www.washingtonwine.org/resource/vintages-30-year-overview/, https://www.ecfr.gov/current/title-27/chapter-I/subchapter-A/part-9/subpart-C, https://www.ttb.gov/regulated-commodities/beverage-alcohol/wine/established-avas, https://www.washingtonwine.org/washington-wine-in-12-stories/, https://www.woodwardcanyon.com/, https://www.lecole.com/our-story/, https://www.ste-michelle.com/chateau-ste-michelle/shop/all-wines/5637155140.c, https://www.cayusevineyards.com/. Secondary sources: https://www.decanter.com/wine/grape-varieties/riesling/international-riesling-day-american-style-499237/, https://www.decanter.com/premium/eroica-25-years-of-ernst-loosens-washington-riesling-collaboration-with-chateau-ste-michelle-550375/, https://www.winespectator.com/articles/quilceda-creek-buys-washington-state-vineyard. Last verified 2026-11-01