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. Its success in producing and selling sacramental wine helped it to survive national Prohibition. Grape cuttings from this vineyard were introduced to Mexico between 1889 and 1904 for the improvement of its commercial viticulture. As such, the vineyard has been designated a California Historical Landmark (#641).