Ullage

Ullage meaning and definition in wine

Ullage means the unfilled headspace above wine in a bottle, barrel, or tank. In bottled wine, the ullage level is a condition clue; in barrels and tanks, it is an oxygen-management issue. This airspace naturally occurs due to evaporation, temperature fluctuations, and the wine’s interaction with its container. In bottles, ullage levels indicate a wine’s age and storage conditions—older wines typically show more ullage as wine evaporates through the cork over time. Excessive ullage can signal poor storage or cork failure, potentially leading to oxidation and wine deterioration. The term “ullaged” describes containers that are not completely full, while “on ullage” refers to wines with noticeable headspace. In barrel aging, winemakers practice topping off or ouillage, regularly adding wine to minimize ullage space and prevent harmful oxidation. This maintenance is crucial during the 18-24 month barrel aging process typical for premium wines. Ullage levels are classified from Level A (minimal ullage, ideal) to Level D (significant ullage, potentially problematic) in wine auction terminology. Professional wine storage maintains consistent temperature and humidity to minimize ullage formation, preserving wine quality and value over extended aging periods.

Ullage FAQ

What does ullage mean in wine?

Ullage means the empty space between the wine and the closure or top of the container. In bottles, it helps indicate age, storage quality, and possible oxidation risk.

What does ullaged mean?

An ullaged bottle, barrel, or tank is not completely full. In wine auctions and cellar notes, the term usually points to a visible fill level below the expected point.

What is ullage space?

Ullage space is the literal volume of empty air between the wine and the top of its container. Winemakers actively manage this space in barrels to limit oxygen exposure.

What does no ullage mean?

No ullage means there is little or no visible headspace. For a bottle, that can suggest a high fill level, but it should still be judged alongside cork condition, capsule condition, age, and storage history.