Véraison

Véraison meaning in viticulture

Véraison marks the pivotal transition in grape development when berries begin their transformation from hard, green, acidic fruit to the mature grapes destined for winemaking. This French term, derived from veraison meaning “to change color,” describes the moment when grapes start their color change—red varieties shifting from green to purple, pink, or red hues, while white varieties become more translucent and golden. The process typically occurs 6-8 weeks before harvest and signals the beginning of the ripening phase. During véraison, grapes undergo dramatic physiological changes: sugar levels begin rising from minimal amounts to eventual concentrations of 20-25° Brix, acidity starts declining, and tannins begin softening in red varieties. The timing varies by variety, climate, and vineyard location, generally occurring between July and September in the Northern Hemisphere. Véraison doesn’t happen uniformly across a cluster or vineyard—berries may change color over several days or weeks, creating a patchwork appearance. This period is crucial for vintners as it helps determine optimal harvest timing and allows for final vineyard management decisions. The onset of véraison also marks when many winemakers begin their most intensive monitoring of grape development.