Spring Mountain District

Spring Mountain District AVA

Wine region
Above the Napa Valley
Type	American Viticultural Area
Year established	1993
Country	United States
Part of	Napa Valley AVA
Other regions in Napa Valley AVA	Atlas Peak AVA, Calistoga AVA, Chiles Valley AVA, Diamond Mountain District AVA, Howell Mountain AVA, Los Carneros AVA, Mt. Veeder AVA, Coombsville AVA Oak Knoll District of Napa Valley AVA, Oakville AVA, Rutherford AVA, St. Helena AVA, Stags Leap District AVA, Wild Horse Valley AVA, Yountville AVA
Total area	8,600 acres (35 km2)
Varietals produced	Cabernet Sauvignon, Merlot, Cabernet Franc, Zinfandel, Petit Verdot, Syrah, Petite Sirah, Pinot noir, Chardonnay, Sauvignon blanc, Riesling

The Spring Mountain District AVA is an American Viticultural Area located in the Napa Valley AVA in California. Spring Mountain District AVA was officially established as an American Viticulture Area in 1993. Encompassed within its bounds are about 8,600 acres (3,480 ha), of which about 1,000 acres (400 ha) are planted to vineyards. Given the small crop yields on hillsides, the region represents less than 2% of Napa Valley wine. Currently the region has just over 30 winegrowers.

The appellation sits on steep terraces of the Mayacamas Mountains that separate Napa Valley from Sonoma Valley and the Santa Rosa Plain. It lies in a northwestern portion of the Napa Valley above and behind the town of Saint Helena. The boundaries of the appellation extend from the top of the ridgeline on the western edge, tracing the Sonoma/Napa County border. From the ridgeline the boundaries extend down to the 400 feet (122 m) contour line at the eastern base of the hillside. The southern boundary is Sulphur Creek and one of its tributaries, while the northern boundary is Ritchie Creek.

Elevations range from 400 feet (122 m) to 2,600 feet (792 m). The region has a predominantly eastern exposure.

Local topography and regional weather patterns make the Spring Mountain District the coolest and wettest appellation within the Napa Valley. These same factors create a diurnal fluctuation in temperature in the summertime that differs from other regions of the Napa Valley. Spring Mountain is only 30 miles (48 km) to the east of the Pacific Ocean. The coastal waters of northern California are strongly influenced by the California Current, an icy flow of water that originates near the Aleutian Islands. This cold current moderates the summer weather in the coastal valleys of Northern California.

Lying between the Spring Mountain appellation and the cold ocean current is a gap in the coastal mountains between Bodega and Tomales Bay and extending through the Santa Rosa Plain. Summer heat in the interior of California creates a low pressure area that draws cold air from the coast through this coastal gap and across the broad Santa Rosa plain. This on-shore air movement is bumped north by Sonoma Mountain pushing the cold air flow towards Santa Rosa Creek, the Northern Mayacamas Mountains, and directly at the Spring Mountain District AVA. The ridge of the Spring Mountain District is lower than Bald Mountain to its south and Diamond Mountain to its north. This lower ridgeline allows the cool, moist coastal air to enter the Napa Valley spilling down over forest and the vineyards that lie on the slopes of Spring Mountain and moderating peak daily temperatures.