(Bloomberg) -- Firefighters are battling to contain a blaze that erupted near the California tourist town of Calistoga on Thursday, prompting the evacuation of nearby wineries and some rural residences.

The Pickett Fire spread rapidly through dry vegetation and now spans nearly 3.3 square miles (8.6 square kilometers) across the hills of Napa Valley wine country, according to the California Department of Forestry and Fire Protection. About 350 firefighters were dispatched to fight the blaze overnight and teams are using three helicopters with night-flying capabilities to help douse the flames.