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From the revered pinot noirs of Burgundy to the iconic cabernet sauvignons of the Napa Valley, the sweet vanilla and spice notes of oak aging are hallmarks of some of the great wines of the world. Wooden barrels are the most traditional vessels in which to age wine, but now producers looking to make lighter styles of wine use modern stainless steel barrels to highlight fresh fruit flavors in their wines.

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What Is Barrel Aging in Wine?

Barrel aging is the cornerstone of the process called élevage, which is the French term meaning “raising” or “upbringing” used to describe what happens to the wine between fermentation and bottling. The wine’s élevage can last for a few months to many years, during which time the wine’s flavors integrate and mature. The winemakers’ choices during the aging process, including how long to age the wine and how much to manipulate it, will have a huge impact on the taste of the finished product. One of the most important choices is whether to age the wine in steel or oak barrels.

How Does an Oak Barrel Affect the Winemaking Process?

There are two main types of oak that can be used to make barrels for use all over the world.: American white oak and European oak. However, European oak barrels are not exclusive to European winemakers and vice-versa. For example, American oak’s stronger flavors are a key component of the wines of Rioja in Spain.

Oak barrels are made from staves, which are long pieces of oak wood that are fitted tightly together with metal hoops. The barrels are toasted over a fire to either a light, medium, or dark toast level. New barrels with a light toast will give lots of vanilla and caramel notes, while a darker toast will give smokey, roasted aromas.

For oak wine barrels, the barrel’s age and size affect the amount of oak flavor that will be transmitted to the wine. Smaller barrels impart more oak flavor because they allow more contact between the wood and the wine. Oak barrels lose their signature flavor compounds with use, so they must be replaced every few vintages.

In addition to adding oak flavors, new oak aging changes the tannin structure of red wines. Tannins from the wood transfer into the wine, giving it a stronger structure. This contributes to a wine’s ageability, or longevity in the bottle. The wood also helps stabilize the tannins from the grape skins, giving them a silkier texture.

After a few years of use, new oak becomes “neutral,” and no longer imparts flavor or tannin to the wine. These neutral barrels still allow for slow oxygenation, so they can be used to age wine that needs to mellow without any oak flavor.

Once the wine barrel has lived its full lifespan in the winery, the creative wine enthusiast can repurpose a used wine barrel into a table top, a bar stool, or a wine barrel planter. Along with wooden wine boxes, solid oak barrel staves make great fuel for a backyard fire pit.

What Do Wines Aged In New Oak Taste Like?

New oak aging adds these aromas to both red and white wines:

  • Vanilla
  • Caramel
  • Baking spices like cinnamon, clove, nutmeg
  • Coconut (especially from American oak)
  • Dill (especially from American oak)

Additionally, you may find these notes in red wine aged in new oak:

  • Smoke
  • Chocolate
  • Coffee
  • Toffee/burnt sugar

How Does a Stainless Steel Barrel Affect the Winemaking Process?

Steel barrels are a type of barrel made from stainless steel used to age wine. The steel imparts no flavor to the wine: it merely holds the wine for a few months while it stabilises and the flavors integrate. Steel barrels also don’t let any oxygen come into contact with the wine. This kind of aging helps wines retain the fresh fruit aromas that degrade with exposure to oxygen.

Winemakers use stainless steel aging for wines that would not benefit from the addition of oak flavors or the softening effect that oak has on tannin. It is more popular for white wines, which, unlike reds, do not have tannins to manage. Stainless steel is the usual choice for aromatic and semi-aromatic white grapes including: