William Grassie Winery Duvall Tasting Room

William Grassie Winery Duvall Tasting Room is an event venue in Seattle, WA, at 15705 Main St NE, Duvall, WA 98019, USA. There is 1 upcoming event listed, starting Fri, Oct 9, 2026. Tickets are sold on the source platform — every listing links straight to it.