Concannon Vineyard is the second-largest winery in the Livermore Valley of California, producing around 30,000 cases annually. It is well known for its Petite Sirah and Concannon was the first winery to bottle this grape as a varietal wine in 1961. It also produces several other varieties of wine, including Chardonnay. Concannon is owned by The Wine Group. Concannon was founded in 1883 by James Concannon of Inishmore, County Galway.