Climate:

Cool-mountain influenced with temperatures about 10–15° cooler than the valley floor in summer, above the fog line, there is low day-to-night temperature range, with summer rarely rising above 90°

Elevation:

760 – 2,600 feet

Key varieties:

Cabernet Sauvignon, Chardonnay

Climate:

Daytime summer temperatures may peak above 100° and fall to low 40° at night, due to cool marine air drawn into the valley from the northwestern hills, cool afternoon and evening breezes continue the process, clear nights are assisted by cold air sliding down the mountainsides to the valley floor

Elevation:

300 – 1,200 feet

Key varieties:

Cabernet Sauvignon, Zinfandel, Syrah, Petite Sirah

Climate:

Temperatures peak in the mid-80s but due to higher elevation and summer fog at night, quite chilly at night (below 50°); with colder winters and spring, as well as strong winds, harvest comes later than on the valley floor

Elevation:

600 – 1,200 feet

Key varieties:

Cabernet Sauvignon, Merlot, Cabernet Franc

Climate:

Cool, with marine winds from the San Pablo Bay as well as the Petaluma Gap to the west, high temperatures rarely exceed 80°

Elevation:

Sea level – 700 feet

Key varieties:

Pinot Noir, Merlot, Chardonnay

Climate:

Moderately warm temperatures with less fluctuation than the north Napa Valley floor, temperatures in the summer range from 50–90°

Elevation:

400 – 2,200 feet

Key varieties:

Cabernet Sauvignon, Cabernet Franc

Climate:

Located above the fog line on the eastern side of the valley, the AVA is warmer and drier than other AVAs with more hours of sunshine and little-to-no marine influence

Elevation:

600 – 2,600 feet

Key varieties:

Cabernet Sauvignon, Merlot and Zinfandel

Climate:

Cool, with marine winds from the San Pablo Bay as well as the Petaluma Gap to the west, high temperatures rarely exceed 80°

Elevation:

Sea level – 700 feet

Key varieties:

Pinot Noir, Merlot, Chardonnay

Climate:

Cool to moderate, with most vineyards above the fog line, meaning warmer nights and cooler days than on the valley floor, typical summer highs are 85°

Elevation:

500 – 2,600 feet

Key varieties:

Cabernet Sauvignon, Merlot, Zinfandel, Chardonnay

Climate:

Moderate to cool, with marine air and fog often remaining until late morning, afternoon breezes frequently occur, maintaining slightly cooler temperatures than up-valley, summer temperatures may reach 92°

Elevation:

Sea level – 500 feet

Key varieties:

Cabernet Sauvignon, Merlot, Chardonnay, Sauvignon Blanc

Climate:

Moderately warm, with temperatures commonly in the mid-90s during summer, but affected by night and early morning fog, the east side receives more warm afternoon sun

Elevation:

Sea level – 500 feet

Key varieties:

Cabernet Sauvignon, Merlot, Sauvignon Blanc

Climate:

Moderately warm, still marginally influenced by early morning fog, the western bench area is cooler, with less late afternoon sun, tempered by afternoon marine winds, usually summer peak temperatures are mid-90s, with a distinct day-to-night temperature fluctuation

Elevation:

Sea level – 600 feet

Key varieties:

Cabernet Sauvignon, Merlot, Cabernet Franc, Zinfandel

Climate:

Warm, due to greater protection from western hills, with less fog and wind, the narrowing of the valley floor provides more heat reflection off the hillsides, summer temperatures often peak in the mid-to-high 90s range

Elevation:

100 – 700 feet

Key varieties:

Cabernet Sauvignon, Cabernet Franc, Merlot, Syrah, Zinfandel

Climate:

Cool weather prevails, most vineyards sit above the fog line, providing warmer nights and cooler days than the valley floor; typical mid-summer high temperatures reach 85°

Elevation:

600 – 2,600 feet

Key varieties:

Cabernet Sauvignon, Merlot, Cabernet Franc, Chardonnay, Zinfandel

Climate:

Moderately warm with afternoon marine winds cooling the warmer air radiating off the bare rocks of Stags Leap and the surrounding hillsides, summer temperatures can reach 100°, but more regularly are in the mid-90s

Elevation:

Sea level – 500 feet

Key varieties:

Cabernet Sauvignon, Merlot, Chardonnay, Sauvignon Blanc

Climate:

A warmer area well to the east, but still moderate by both altitude and prevailing winds coming off Suisun Bay to the southeast

Elevation:

600 – 1,900 feet

Key varieties:

Cabernet Sauvignon, Pinot Noir, Chardonnay

Climate:

Moderate, with cool marine influence and fog contributing to cool summer mornings, the marine breeze keeps afternoons more comfortable than further up valley; summer peak temperatures may reach 90° with night time temperatures dropping into the mid-50s

Elevation:

20 – 200 feet

Key varieties:

Cabernet Sauvignon, Merlot