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, of which about 1,000 acres 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.