Rosenblum Cellars was founded in 1978 in Alameda County. The winery is unusual in that it is located in the East Bay just across from San Francisco. It was founded by Kent Rosenblum, a veterinarian with an interest in wine, and today the business is still run by the Rosenblum family. The winery makes a large selection of wines sourced from grapes grown in virtually every region of California, from Sonoma and Paso Robles, to Contra Costa, Santa Barbara and Mendocino. Rosenblum makes about 50 wines a year. They are known for Zinfandels, Rhone-style reds and whites, and dessert wines. Many of the wines are vineyard-designated.
Sonoma County is not an AVA, but it is a commonly used informal designation for wines made outside of more specific AVAs within Sonoma, which is a large wine producing region just west of Napa Valley. Though Sonoma is often overshadowed by its glamorous neighbor Napa Valley, it has a long history of wine production. The area specialized in jug wine until the mid-20th century, when Sonoma producers took a cue from Napa and started improving quality. Unlike Napa, where Cabernet Sauvignon is king, Sonoma specialized in Chardonnay, Pinot Noir and Zinfandel, though excellent Cabs are produced too. There are at present 16 AVAs within Sonoma County, and, like much of the West Coast of the United States, new AVAs are created in Sonoma County with regularity. Some Sonoma appellations, such as the Russian River Valley, are renowned for Pinot Noir and Chardonnay.
This grape is grown in milder climates and produces a medium-to full-bodied wine. It is also known as Shiraz, but should not be confused with Petit Sirah, which was developed by crossing Syrah with Peloursin.