Search results
According to the 2023 USDA Hardiness Zone Map Napa County, California is in Zones 10a (30°F to 25°F), 9a (20°F to 25°F) and 9b (25°F to 20°F). This is a change from the 2012 USDA Hardiness Zone Map which has Napa County in Zones 9a (20°F to 25°F), 9b (25°F to 20°F) and 10a (30°F to 25°F).
Climate Averages, Frost Dates, Hardiness Zones and Drought Conditions for Napa California
The NVV’s vintage charts depict key stages of the growing season from January through the middle of September, including the high and low temperatures for each day and rainfall amounts. Tracking these key stages plays an important role in the planning of the season and harvest logistics.
Climate Averages, Frost Dates, Hardiness Zones and Drought Conditions for Napa California
Ideal Growing Conditions. The Climate of Napa Valley. The Napa Valley is known for its large diurnal shifts—the temperature swing from daytime peak to nighttime low. This gives our fruit a chance to ripen slowly, maintaining the acidity needed for long ageability. An ideal dry Mediterranean climate; Cooled by both coastal fog and wind
Defined by mountain ranges and influenced by its proximity to the Pacific Ocean, the Napa Valley enjoys a dry Mediterranean climate perfectly suited to the growing of fine wine grapes.
The Growing Conditions Report (GCR), produced in cooperation with Pacific Geodata, Picovale Weather Service, Pina Vineyard Management, and Ruetd, contains maps, tables, and graphs depicting regional Napa climate data and provides a countywide overview of general growing conditions.
