Winter, spring, summer or fall, any time of year is the right time to visit a winery.
Winter: Barren vines look like sticks during the quiet winter months, but you’ll have more chance to interact with winemakers. Look for good wine deals during the holidays.
Autumn: Wake up early during harvest to see workers bringing in grapes. On the cellar tour, check out the crush (but watch out for forklifts).