Jory Soil

Jory soil has one of the most dramatic origin stories in world viticulture. Between 14 and 17 million years ago, during the Miocene epoch, massive fissure eruptions released enormous basaltic lava flows from what is now eastern Washington and Idaho. These Columbia River Basalts traveled westward, eventually blanketing vast swaths of what would become Oregon and Washington. Over millions of years of weathering, the basalt broke down into the deep, iron-rich clay loam we recognize today as Jory. The soil's striking brick-red color comes directly from its high iron oxide content, a legacy of that volcanic parentage. Crucially, Jory soil is found exclusively above approximately 300 feet in elevation, because the catastrophic Missoula Floods of 10,000 to 18,000 years ago buried everything below that elevation under thick layers of sedimentary material. The hillsides that escaped those floods retained their ancient volcanic character, and it is precisely on those elevated slopes that Oregon's most prized Pinot Noir vineyards sit today.

• Parent material is Columbia River basalt, formed from lava flows 14 to 17 million years ago during the Miocene epoch
• High iron oxide content gives Jory its unmistakable brick-red to rufous color
• Found only above roughly 300 feet elevation, having escaped burial by the Missoula Floods
• Classified by the USDA as a Xeric Palehumult, meaning a deeply weathered, ancient soil with a xeric (dry-summer) moisture regime

Jory is technically described as a very deep, well-drained soil formed in colluvium and residuum derived from basic igneous bedrock. The surface layer is typically a silty clay loam, while the subsoil (the argillic or Bt horizon) grades into clay or silty clay and extends to depths of over 60 inches (150 cm). This means vine roots can penetrate exceptionally deep, accessing stored moisture and minerals well below the surface. The soil has a moderately acid pH (around 5.6 at the surface), which is consistent with the low base saturation typical of Ultisols. Its clay mineral composition is mixed, with kaolinite present but not dominant. The moderate organic matter content decreases with depth. Most importantly for viticulture, Jory's clay-loam structure gives it an unusual ability to retain water during the dry Oregon summers while still draining excess moisture. This combination of deep profile, water retention, and excellent drainage is precisely what Oregon's largely dry-farmed vineyards depend upon.

• Very deep profile, typically 4 to 6 feet, with the argillic (Bt) horizon extending beyond 60 inches
• Silty clay loam surface transitioning to clay or silty clay subsoil; slopes range from 2 to 90 percent on foothills
• Moderately acid pH (around 5.6 at surface), low base saturation, and low overall fertility
• High water-holding capacity in the clay-rich subsoil allows dry-farming through Oregon's rainless summers

Jory soil is the signature terroir of the Dundee Hills AVA, the most prominent sub-appellation of the Willamette Valley and widely regarded as the birthplace of Oregon's Pinot Noir movement. The Dundee Hills, established as an AVA in 2004, encompasses 12,500 acres at elevations rising from 200 to 1,067 feet above sea level. Jory is its predominant soil, covering the hillsides that first drew pioneers like David Lett (who planted his Eyrie Vineyards in 1966) and Dick Erath to Oregon. Beyond the Dundee Hills, Jory also appears in the Eola-Amity Hills, the Chehalem Mountains, and the Red Hill Douglas County AVA in southern Oregon, where volcanic basalt soils up to 20 feet deep support diverse varietals. In the Chehalem Mountains, the AVA is uniquely home to all three major Willamette Valley soil types (volcanic, sedimentary, and loess), allowing direct comparative viticulture. Jory is identified across nine western Oregon counties in total.

• Most strongly associated with the Dundee Hills AVA, established 2004, where it is the predominant soil series
• Also present in the Eola-Amity Hills, Chehalem Mountains, and Red Hill Douglas County AVAs
• David Lett planted the first Pinot Noir in the Dundee Hills in 1966, specifically selecting Jory soils for their low fertility and water retention
• Jory is identified across nine western Oregon counties on more than 300,000 total acres

The fingerprint of Jory soil on Pinot Noir is well documented by Oregon's winemaking community. Wines grown on Jory soils are broadly characterized by bright red and blue fruit flavors, including cherry, red plum, and red currant, underpinned by a distinctive floral quality and notes of baking spice including cinnamon, clove, and allspice. The high iron and magnesium content of Jory contributes to a noticeable minerality on the finish. Tannins tend to be softer, smoother, and better integrated than those from marine sedimentary soils, and acidity remains lively even in warm vintages, a consequence of the soil's low fertility restraining vine vigor and preserving natural freshness. The deep water-retaining clay profile eliminates the need for irrigation across most Jory vineyards, stressing the vine naturally and concentrating flavors in the berry. Winemakers consistently describe Jory-grown Pinot Noir as having a broad mid-palate, silky texture, and a spice-driven character that is remarkably consistent from vintage to vintage.

• Characteristic aromas of bright red cherry, red plum, red currant, with floral notes and baking spice (cinnamon, clove, allspice)
• Softer, better-integrated tannins compared to Pinot Noir from marine sedimentary Willakenzie soils
• Good natural acidity maintained even in warm years, supported by low soil fertility limiting vine vigor
• Ferrous minerality on the finish attributed to the soil's high iron oxide content

One of Jory soil's most practically important attributes for viticulture is its suitability for dry farming. Oregon's Willamette Valley receives most of its annual rainfall (around 45 inches per year) during the winter and spring, with summers being largely dry. Jory's deep clay subsoil retains water from those wet seasons, making it available to vine roots during summer drought stress. This is why virtually all Jory-planted vineyards in the Dundee Hills are dry farmed, without supplemental irrigation. David Lett specifically identified this water-holding capacity as one of the primary reasons he chose Jory soils for his pioneering Eyrie Vineyards. The low fertility of Jory, while limiting for most crops, is a viticultural virtue: it naturally restricts vine vigor, reduces crop load, and directs the vine's energy toward producing concentrated, complex fruit rather than excessive foliage. The soil also naturally supports a xeric moisture regime, meaning its chemistry and structure are well adapted to Oregon's wet winters and dry summers.

• Deep clay subsoil retains winter rainfall, enabling dry farming through Oregon's dry growing season without irrigation
• Low natural fertility restricts vine vigor, reducing yields and concentrating flavor in the fruit
• Xeric soil moisture regime matches Oregon's wet-winter, dry-summer climate pattern perfectly
• Pioneer David Lett selected Jory specifically for its water retention and low fertility as early as 1966

Jory soil holds a rare distinction: it is the official state soil of Oregon, designated by the Oregon Legislative Assembly on May 23, 2011. The recognition followed nearly two decades of advocacy by the Oregon Soil Science Society, which had informally championed Jory as a state symbol since 1993. The soil is named for Jory Hill in Marion County, which itself commemorates pioneers James and Mary Jory, who arrived via the Oregon Trail and settled the area in 1852. USDA soil scientists formally identified and described the Jory series in 1970 in Benton County. Beyond wine, Jory supports Christmas tree farms, hazelnut (filbert) orchards, berry cultivation, and Douglas fir forests across western Oregon, making it a cornerstone of the state's broader agricultural identity. In the wine world, the soil's name has become shorthand for a specific Oregon terroir style, with wineries such as Stoller Family Estate, Domaine Drouhin, Archery Summit, Domaine Roy, and Lange Estate building their reputations on Dundee Hills Jory-grown Pinot Noir.

• Officially designated Oregon's state soil by the Legislative Assembly on May 23, 2011
• Named for Jory Hill, Marion County, honoring Oregon Trail pioneers James and Mary Jory (settled 1852)
• Formally identified by USDA soil scientists in 1970 in Benton County, Oregon
• Beyond viticulture, Jory supports hazelnuts, Christmas trees, berries, and Douglas fir, underpinning Oregon's broader agricultural economy