This week's rain has lots of winemakers a bit anxious.
Winemakers in the Livermore Valley depend on the grape harvest and said while they need rain, the wet weather can cause trouble on the vines.
"Bloom is over and the fruit is set so all the fruit we're going to get is there now," Las Positas winemaker Brent Amos said. "It's just a matter of maintaining that."
Winemakers in the Livermore Valley wine country are keeping a close eye on the grapes.
At Las Positas, 30 acres of vines got wet in the rain.
Amos said during the drought the water is welcome. The more than 50 wineries in the Livermore Valley may not have to water for a week as a result of this week's rain. But staff will be checking the fruit.
Winemakers said wet grapes can lead to mildew and disaster.