United States. Texas is an emerging wine region with a vast and varied landscape, where high-elevation areas like the Texas High Plains AVA produce bold, sun-ripened wines—especially Tempranillo, Mourvèdre, and Viognier—that thrive in the warm, dry climate and reflect the state’s growing ambition to define its own distinctive wine identity. The Texas Hill Country AVA is an area that has seen a lot of growth and increased popularity over the last decade.