Vineyard Shot

Wine Making

StoneTree Vineyard

Bound by the Columbia River & the Saddle Mountains, on the Wahluke Slope, StoneTree Vineyard produces some of the highest quality wine grapes in Washington.


StoneTree Vineyard is a 240-acre, gently sloping hillside northwest of Mattawa in Grant County. Bound by the Columbia River & the Saddle Mountains, this wine-growing region known as the Wahluke Slope, has produced some of the highest quality wine grapes in Washington. StoneTree Vineyard is a south-sloping vineyard with an overall elevation gain of over 300 feet. The Wahluke Branch Canal runs along the bottom of the property at an elevation of 940 feet. The elevation at the top of this vineyard is 1250 feet. Lying just west of the “saddle” of the Saddle Mountains, StoneTree is the highest elevation vineyard with the most elevation change on the Wahluke Slope. Before trellis installation, each block of the vineyard was surveyed individually in centimeters. The average annual rainfall is 7.5 inches.

Soil is classified as sandy loam, predominately the Scoon series. The Scoon series consists of very shallow, well-drained soils on terraces & alluvial fans. This is typical of a geological location where fine-grained wind-blown loess has been deposited on a more durable substrate. The underlying sediments & glacial outwash were deposited 13,000-20,000 years ago by the catastrophic floods of glacial melt water from the Glacial Lake Missoula. The flood water reached an elevation of 1450 feet.

Forgeron Cellars has sourced Primitivo from StoneTree Vineyard since 2007. We also source beautiful Malbec & Merlot from this consistent site.

Marie-Eve comments: I find the growing conditions at StoneTree (Wahluke Slope) and Klipsun (Red Mountain) to be very similar, with extremely dry and windy weather. These conditions are very favorable to the production of  big red wines, as they toughen the skin of the berries and promote development and concentration of full tannins and flavor in the grape.