The Stages of Harvest in Napa Valley
As with anything agriculture, the timeline below is a general reference as to when certain grape varieties are picked in the Napa Valley. There are many factors that determine when the grapes are harvested: the grape variety itself; where in the Napa Valley the vineyard is situated; the influence of microclimates throughout the valley (fog, San Pablo Bay influence, hillside vs. valley floor, aspect and exposure, etc.); winemaking styles; soil types (looser, gravelly soils tend to ripen grapes early; heavier, clay soil, later); and in the end, how Mother Nature plays her cards. Harvest can stretch from late July and into November. There are overlaps and sometimes block by block picking, but below will give you a general sense of what comes in when and why.