Chateau Ste. Michelle is Washington State's oldest winery, located in Woodinville, Washington, near Seattle. It produces Chardonnay, Cabernet, Merlot, and Riesling, and has winemaking partnerships with two vintners: Col Solare is an alliance with Tuscany's Piero Antinori and Eroica Riesling is a partnership with the Mosel's Ernst Loosen. Chateau Ste. Michelle was selected as Wine Enthusiast magazine's 2004 American Winery of the Year. It was owned by Altria (formerly known as Phillip Morris), and then sold to the private equity firm Sycamore Partners in 2021.