After decades of living in the middle of Beervana, many Portlanders are familiar with how beer is made. In brewpubs around the city, patrons can sip the wares in close proximity to giant vats of beer while brewmasters stomp around in galoshes carrying out their work.

Winemaking, too, has long been part of the Oregon landscape, but for city dwellers, the process still holds an air of mystery. It generally takes place in the Willamette Valley, and anyone who wants to watch winemakers in action must make a special pilgrimage to wine country.

Now a group of urban winemakers is ...