Spill tags 5 wineries in Sonoma Valley for a cave or cellar you can visit. Walk-ins are welcome at 1 of them, and 3 ask for a reservation. A typical tasting is $75.
Can you taste inside the cave at Sonoma Valley wineries?
At many of them, yes, and it is usually a booked tour rather than the standard tasting. Caves stay around 60 degrees, so bring a layer even in summer.