Although most people don't associate San Jose with wine country there are some good wineries both in and nearby the city which welcome visitors.  Such places, located right in the San Jose, include Mirassou Winery and The Bargetto Winery.  They both have tasting rooms and wine shops and also host special events and tastings.  Their websites give directions and details. 

Other local wine producers include Ridge Vineyards (Cupertino) and   Savanah-Chanelle Vineyards.  Ridge produces zinfandels that have won top awards around the world.  Savanah-Chanelle makes only pinot noir wines in small batches.  Their products can be purchased at their store.  Directions and contact information are available online. 

Many other small winemakers also call the region surrounding San Jose home.  For a partial listing of other wineries in the area, see the San Jose Convention & Visitors Bureau's winery page.