Certified Sommelier Test 2026 – 400 Free Practice Questions to Pass the Exam

The Napa County AVA known for being the most recently established is Calistoga. This AVA was officially recognized in 2010, making it one of the newest appellations in Napa Valley. Calistoga is known for its unique soils and climate, which support a variety of grape varietals, particularly Zinfandel and Cabernet Sauvignon.

Atlas Peak, Diamond Mountain District, and Howell Mountain are all older AVAs in Napa County, established well before Calistoga. Their longer history contributes to a more established reputation with specific terroirs and wine styles associated with each. Understanding the timeline of these AVAs can provide insights into the trends and developments in Napa wine production.