COLD SNAP: As freezing temperatures hit California, citrus growers in the San Joaquin Valley are seeing some damage to the mandarin crop. A trade group's president said there is $1.5 billion worth of citrus on the trees, with the cold at "dangerous levels."

MANDARINS AT RISK: Mandarins are more susceptible to cold and are grown in areas where temperatures dipped into the 20s overnight.

FIGHTING BACK: Growers have been running irrigation water and turning on wind machines to ward off the cold.