Tualatin Hills is an American Viticultural Area (AVA) located due west of Portland and just east from the Oregon Coast Range in the upland hills of the Tualatin River watershed and encompasses elevations between 200 and 1,000 feet (61 and 305 m). It was established on May 13, 2020 by the Alcohol and Tobacco Tax and Trade Bureau (TTB) after reviewing the petition from Rudolf Marchesi, president of Montinore Estate, Alfredo Apolloni, owner and winemaker of Apolloni Vineyards, and Mike Kuenz, general manager of David Hill Vineyard and Winery, on behalf of themselves and other local grape growers and vintners, proposing the establishment of the "Tualatin Hills" viticultural area in portions of Multnomah and Washington Counties. It lies entirely within the northernmost location of the Willamette Valley AVA in and around towns like Gaston, Forest Grove, Sherwood and Cornelius. To the south and southeast are the Chehalem Mountains with elevations of over 1,000 feet (300 m) and considered to be a separate, distinct landform from the uplands within Tualatin Hills. The region stretches over approximately 144,000 acres (225 sq mi) and contains 21 wineries with 33 commercially-producing vineyards that covers approximately 860.5 acres (348 ha). The distinguishing features of Tualatin Hills are its soils, elevation, and climate.

The Willamette Valley is full of microclimates, varying aspects and more that have a profound impact on the wines grown there. Tualatin Hills is partially adjacent at its southern end to Laurelwood District AVA which was established with Tualatin Hills. The two AVAs are both noted for the Laurelwood soils consisting of exceptionally fine loess deposited over ancient basalt. The silt-sized sediment was formed by the accumulation of wind-blown dust produced by the grinding down of basaltic and other volcanic rocks by glaciers during the last Ice Age. However, Tualatin Hills also contains Kinton and Cornelius soils mixed with the Laurelwood soil while its adjacent AVA is primarily a concentration of its namesake soil.

The area lies in the heart of Oregon's Pinot Noir producing zone. It is home to some of the oldest vineyards in Oregon, including David Hill, Ponzi and Cooper Mountain. The AVA petition filed at the TTB in 2015 was led by Alfredo Apolloni of Apolloni Vineyards, Rudy Marchesi of Montinore Estate and Mike Kuenz of David Hill Vineyard and Winery.

• Tualatin Hills Washington County Visitors Association
• TTB AVA Map

45°32′51″N 123°09′27″W / 45.5476°N 123.1574°W / 45.5476; -123.1574