Paso Robles is the third American Viticultural Area (AVA) located in San Luis Obispo (SLO) County, California. It was established by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury on November 3, 1983 based on a petition submitted by Martin Brothers Winery. The area encompasses 609,673 acres (953 sq mi) with approximately 18,500 acres (7,487 ha) cultivated with wine grapes known for their heritage varietal Zinfandel, Cabernet Sauvignon, and Rhône-style wines.

The name of the area dates from the late 18th Century, the missionary period of the area. The full Spanish name is "El Paso de Robles" or "the Pass of the Oaks." This name was given by travelers between the San Miguel mission, located within the boundaries of the viticultural area, and Mission San Luis Obispo. A land grant, in this name, was conveyed by Governor Micheltorena to Pedro Narvaez on May 12, 1844. This land grant includes the present areas of Paso Robles, Templeton, and Adelaida. The land grant was patented on July 20, 1866, to Petronillo Rios. In 1857 the Paso Robles land grant was purchased by three men. These men, capitalizing on the hot springs and mud baths of the area, set out to make the Paso Robles Hot Springs one of the finest resort spas in the Country and built the first of the famous hotels. The community serving the hotel and resort visitors was incorporated as the City of El Paso de Robles on February 25, 1889. Since that time, the entire area of the viticultural area has been referred to as the Paso Robles area.

Grapes were first introduced into the Paso Robles area in 1787 by Spanish missionaries at Mission San Miguel Arcangel, founded in 1797, produced wine and it is assumed that the grapes were harvested in nearby areas. The earliest date was 1873 showing that approximately 40 acres (16 ha) were vineyards. One winery established in the last century is still involved in wine production, Rotta Winery, now Mid•point Wine. In addition to this winery, there are twelve others and one under construction. There were 62 existing vineyards at the establishment of Paso Robles viticultural area comprising approximately 5,000 acres (2,023 ha) with more grape plantings planned, generally adjacent to or in close proximity to the existing vineyards. Commercial wine growing, however, was not started until the 1880s with the establishment of Ascension Winery, later known as York Mountain Winery, and today known as Epoch Estate Wines. In 1914, Ignacy Jan Paderewski, the famous Polish pianist, conductor, and statesman, established a vineyard on his ranch. The Zinfandel grape was introduced to the area in this vineyard. Wine produced by York Mountain Winery from this vineyard was awarded a gold medal at the California State Fair. Since 1990, when there were fewer than 20 wineries in Paso Robles, a large expansion of activity has seen the number rise to more than 200 wineries today. Wine critic Robert M. Parker, Jr. commented on the region's promise of quality of wine, emphasizing the wineries L'Aventure, Linne Calodo, Saxum Vineyards, Doce Robles "Twelve Oaks" Winery & Vineyard, Villa Creek Cellars, Castoro Cellars and Tablas Creek Vineyard as the "leading Paso pioneers".

In 2007, a proposal to split the area at the Salinas River and form a new "Paso Robles Westside AVA" was made. The proposal was withdrawn in 2009, and a new proposal was made to sub-divide the AVA into eleven viticultural areas with their separate unique attributes.

Effective on November 10, 2014, Alcohol and Tobacco Tax and Trade Bureau (TTB) issued a final rule in the Federal Register establishing eleven distinct sub-appellations within the existing Paso Robles viticultural area.

• Adelaida District AVA
• Creston District AVA
• El Pomar District AVA
• Paso Robles Estrella District AVA
• Paso Robles Geneseo District AVA
• Paso Robles Highlands District AVA
• Paso Robles Willow Creek District AVA
• San Juan Creek AVA
• San Miguel District AVA
• Santa Margarita Ranch AVA
• Templeton Gap District AVA

The Paso Robles AVA is still acknowledged for its heritage grape, Zinfandel, but has gained recognition from a wider range of grape varietals as well. In the 1950s and 1960s, growers began to plant Bordeaux varieties, particularly Cabernet Sauvignon, in the area. Starting in the 1980s, there have been increased plantings of many Rhône varieties, including the first Syrah planted in California, as well as Viognier and Roussanne to name a few. The emerging popularity of the region's wines led it to become the first site of the bi-annual "Hospice du Rhône" conference on Rhône style wine. Today, Paso Robles Wine Country is receiving attention for its unique Paso blends. These wines are unique to the area, and with varietal make-ups that do not follow traditional rules and expectations of winemaking, as characteristic in other regions of the wine world.

The Paso Robles Zinfandel Festival, now known as Vintage Paso: Zinfandel Weekend, is a festival focused on the Paso Robles area's heritage grape, Zinfandel. This event is held by the Paso Robles Wine Country Alliance, a non-profit cooperative marketing alliance.

The Paso Robles Wine Festival is a festival focused on the wide variety of wines the area produces, held in Paso Robles' downtown city park. Attendees have the opportunity to talk with the Paso Robles vintners and taste their wines.

The Harvest Wine Weekend is a celebration of the harvest season with three days of hands-on Paso Robles Wine Country activities.

In 2015, the Paso Robles Wine Country Alliance started a new festival, BlendFest on the Coast, dedicated to the unique wine blends of Paso Robles, held on the coast in San Simeon and Cambria.

• Wine Spectator #1 Wine in the World 2010: Saxum
• Wine Enthusiast Magazine 2013 Wine Region of the Year
• Sunset Magazine 2016 Best Wine Country Town

• Paso Robles Wine Country
• SLO Cal Wine Country
• TTB AVA Map

35°36′26″N 120°36′29″W / 35.6071502°N 120.6081466°W / 35.6071502; -120.6081466