Which AVA was the first to receive its own designation in Napa County?

Howell Mountain was the first American Viticultural Area (AVA) to be designated in Napa County, receiving its designation in 1983. This area is recognized for its distinctive terroir, which is characterized by higher elevations and volcanic soil that contribute to the unique flavor profiles of the wines produced there. Howell Mountain is well-known for producing standout Cabernet Sauvignon and Zinfandel varieties.

The significance of this designation lies not only in its historical context but also in how it influenced the delineation of Napa Valley into smaller, distinct regions that reflect specific agricultural practices and climatic conditions. Other regions like Calistoga, St. Helena, and the overarching Napa Valley have their unique characteristics but were designated later than Howell Mountain. Understanding the history and characteristics of AVAs is crucial in grasping the wine landscape of Napa County.