Spill lists 15 wineries in Los Carneros that confirm they offer a vineyard or cellar tour. Walk-ins are welcome at 2 of them, and 9 ask for a reservation. A typical tasting is $50. The wineries themselves maintain the facts on 2 of these pages.
Do winery tours in Los Carneros need a reservation?
Almost always. Tours run at set times with small groups, so book the tour and the tasting together. A tasting alone is often easier to get on short notice than a tour.