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Paso Robles is the largest AVA in San Luis Obispo County, itself part of the Central Coast region of California. Pasa Robles' northern boundary follows the county line separating San Luis Obispo from Monterey. Its southern boundary is less defined, but comes close to the town of San Luis Obispo and the neighboring Edna Valley AVA. To the east is the Santa Lucia coastal mountain range, which shields much of Paso Robles from coastal influences. Grape growing here dates back to the late 18th century, when the first vines were planted by Spanish missionaries.
A warm inland climate prevails throughout much of Paso Robles, although the Templeton Gap does allow some ocean breezes seep into western parts, meaning that cool-climate varieties can be grown. More than 45 different types of soil have been identified in the region – the majority deep and well drained, and therefore well suited to quality viticulture.
There are many differences in terroir across Paso Robles. Most of the grapes are grown in the dry, inland, eastern half of the AVA, where conditions are conducive to the production of full-bodied wines. These wines often display rich fruit flavors and soft tannins as a result of the warmer climate. Many grapes varieties flourish here, although Cabernet Sauvignon, Syrah and Zinfandel are the most common. When grown in the cooler western parts of Paso Robles, these varieties have more acidity and noticeable tannins – the key ingredients for longer aging. Pinot Noir and Chardonnay produced in western Paso Robles also have a fine reputation.
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