Base map via the TTB AVA Explorer (click to enlarge)
On August 28 (2023), the TTB (Alcohol and Tobacco Tax and Trade Bureau) of the United States announced the approval of the Winters Highlands American Viticultural Area (AVA). The new AVA is located in portions of California’s Solano and Yolo Counties.
The Winters Highlands AVA is inland from the North Coast AVA and not located within any other AVA. The new AVA is situated between the California Coast Range and the Sacramento River Valley and includes the eastern most foothills of the northern Coastal Range with gentle to steep slopes at elevations ranging between I00 feet/30 m and 400 feet/120 m above sea level.
According to the original petition—submitted on behalf of Berryessa Gap Vineyards and originally submitted in November of 2023—the distinguishing features of the Winters Highlands AVA include its soil and climate—as described below.
Soil: The soils in the Winters Highlands AVA—consisting mainly of moderately well-drained clay and loam derived from sedimentary soils—tend to stay warm in the winter and cool in the summer. They are similar in parent material to the soils found in the surrounding areas; however, the texture differs due to variances in erosion and weathering.
Base map via the TTB AVA Explorer (click to enlarge)
Climate: The new AVA is located on the eastern (inland) side of the California Coast Ranges, which provides some shelter from the cooling effect of the Pacific Ocean. However, the Berryessa Gap—a break in the mountains where Putah Creek flows into Lake Berryessa—allows for some cooling effect (particularly in the evenings). As a result, while the new AVA has more degree days and is warmer overall than most of the surrounding areas; it does tend to be cooler at night and therefore benefits from the “warm days/cool nights” conditions beneficial to the cultivation of Mediterranean grape varieties.
The Winters Highlands AVA covers a total of 7,296 acres; of these, approximately 134 acres are currently planted with commercial vineyards (with another 60 acres in the planning stages). Petite Sirah, Tempranillo, Zinfandel, and Malbec are the leading red grape varieties; white varieties include Chardonnay, Albariño, Verdejo, and Sauvignon Blanc. There are currently three wineries—including Berryessa Gap Vineyards and Turkovich Family Wines—located within the new AVA (as well as several in the planning stages).
When the Winters Highlands AVA is brought into force—on September 28, 2023—the total number of AVAs in the United States will be 269; of these, 149 will be in California.
Welcome to the world, Winters Highlands AVA!
References/for more information:
- Establishment of the Winters Highlands AVA-TTB Final Rule
- Petition to Establish the Winters Highlands AVA
Post authored by Jane A. Nickles…your blog administrator: jnickles@societyofwineeducators.org