By Malvina Demaj Last Updated: Mar 6, 2026

Fermentation

(fuh-muhn-tay-shn)
DEFINITION

Fermentation

Fermentation is a natural biochemichal process where yeast consumes the natural sugars (glucose and fructose) in grape juice and converts them into alcohol, carbon dioxide and heat. It can take 7 days to several weeks for complete fermentation to occur and at the end, grape juice is transformed into wine. White wines are fermented cooler (50-64°F) to retain their fruit notes, while red wines ferment warmer (68-86°F) to extract color and tannins.

Did you know? A single packet of yeast can multiply itself over 200 times during fermentation.

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