Ask a Wine Pro: When Does an Open Bottle of Wine Go Bad?

words: Julia Larson
illustration: Ariela Basson
Published: December 29, 2021

There are some times when you crave a glass of wine, but not the whole bottle. But how can you tell if your opened bottle of wine is still good?

Wine is a very finicky thing, and if not treated right, your leftover vino might as well already be poured down the drain. To learn why some wines last a little longer than others and how to avoid a little waste, VinePair taked to Alisha Blackwell-Calvert CSW, an independent wine consultant in St. Louis.

When it comes to opening a bottle of wine, Calvert says, it is a race against time. “Oxygen is a wine’s best friend, but also [its] enemy,” she says.

“Once a bottle of wine is uncorked, it’s like there is a timer on it.”

Consumers tend to think that oxygen is a good thing for wine — wine is poured into extravagant decanters, swirled in the glass, and slurped loudly by somms all in the name of incorporating oxygen into it. This is initially to let the wine “breathe,” letting oxygen back into the wine to open up flavors and aromas that were stifled in the bottle. “That initial oxygen is great — it aids in building the aroma as it transcends into your nose,” says Blackwell-Calvert.

“But depending on the wine, after a couple of days, the aromas change.”

If at first sip you got notes of fresh fruit, it can develop aromas of a cooked fruit, or even vinegar.

There are some obvious signs that a wine has gone bad, like cork taint. But when a wine has been open for too long, it can end up tasting a little bland. Or, if it was high in alcohol in the beginning, it will taste a bit boozier. If you are planning on only using a small portion of a bottle, plan ahead by using wines that have more preservatives in them, such as sulfites or sugar. Sulfites are a naturally occurring preservative that occur on the skins of the grapes, and they give wines the ability to maintain and develop flavors as they age. Sugar, on the other hand, is key to the fermentation of wine. More residual sugar likely means there is less alcohol, which is more volatile when it comes to oxygen exposure.

“Preservatives help a wine keep and stay better for longer,” says Balckwell-Calvert. “For example, a Riesling will stay for longer because it has more sugar compared to other wines.” Oak is another natural preservative, helping keep wines like Chardonnay and Cabernet Sauvignon fresher for longer.

When buying a bottle to sip throughout the course of a week, look for styles that have thicker-skinned grapes that have a bit more body and structure to them.

“Grapes that have a thinner skin, like a Grenache or a Pinot Noir, tend not to do well open because they have less preservatives and sulfites,”

says Blackwell-Calvert. “They have less tannin structure and acidity; they tend to die quicker once they’ve been opened.”

In some cases, leaving a bottle open may be more like a slowed-down way to enjoy a wine and note the differences as the flavor develops.

“There are some wines, like a Brunello di Montalcino, that will actually show better a couple of days after being open,”

says Blackwell-Calvert. “I guess that is also what a decanter is for.”

But if the wine you decided to sip on doesn’t follow any of the above criteria, there is no reason to just throw it away. “My recommendation is to put the cork as far as possible down the neck of the bottle,” says Blackwell-Calvert. “Put the bottle in the fridge; never leave it on the counter. When you are ready to drink it again, take the bottle out of the fridge for 30 to 40 minutes to warm up.”

If you are someone who repeatedly drinks a little from the bottle at a time, she also recommends buying a Coravin preserver. Or, if you’re not attached to the aesthetics of glass bottles, try a boxed wine. These often last for weeks in the fridge due to their lack of oxygen exposure.

Even if you missed every step — bought a light-bodied, high-alcohol wine and left it on the counter — but you still thought it tasted good, then go ahead and keep enjoying it.

“A wine is good if you taste it and think it tastes good,”

says Blackwell-Calvert. “If it has been open for four to five days and you still like it, then it is still a good wine.”

New Zealand wines and the question of age

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Rebecca Gibb MW- 3 August 2018

These words were uttered by the French-born English wine merchant and author André Simon in 1964 when tasting Hawke’s Bay winery Te Mata’s 1912 red blend.  More than half a century after it was first made – the same year as the sinking of the Titanic – the red wine was still very much alive, so why has New Zealand not developed a reputation for making age worthy wines?

Two words: Sauvignon Blanc.

The New Zealand wine industry is dominated by a grape variety that is typically fermented and put into bottle within months – or even weeks – of being harvested. ‘Picked, pressed and pissed before Christmas’ is the life cycle of Sauvignon Blanc in some winemakers’ view.  Why wait for Christmas when you can drink the wine before Easter?  Moana Park winery has released a Sauvignon Blanc on April 1 and that was no April Fools.  If the previous vintage has been small and stocks are running low, a few blocks might be picked early to produce a wine to bridge the gap between vintages, such as Villa Maria’s Early Release Sauvignon Blanc.

However, there are a growing number of smaller, quality focused producers that are holding back their Sauvignon Blancs before releasing, giving them time on lees and time in bottle.  Having tasted some of Marlborough’s finest Sauvignon Blancs at seven or eight years old, drinkers need not be in such a hurry.  Putting the brakes on wineries releasing wines doesn’t help their cash flow and with grape growers to pay and bank repayments due, accountants can overrule winemakers, putting the onus on drinkers to put the wines in their usually non-existent cellars.

It is partly a matter of wine culture: New Zealand does not have a long-standing tradition of making and drinking wine.  Having rejected Prohibition in 1919, the country continued to operate under a cloud of abstemiousness, promoted by restrictive licensing laws.  Until 1961, New Zealanders couldn’t enjoy a glass of wine with a meal in a restaurant.  The 1960s brought licensing change with more and more restaurant licences granted, a rise in the number of wine shops while a rise in tax on beer and spirits in the 1958 ‘Black Budget’ gave wine an encouraging bump.

The 1950s witnessed the birth of aspirational winemakers and pioneers seeking to move away from fortified wine and hybrids to quality table wine made from vitis vinifera, which gained increasing momentum, culminating in legislation outlawing a sugar and water culture and a state-sponsored vine pull in the 1980s.  In the 1970s, regular wine columns had appeared in several newspapers, catering for an educated population who had done their ‘OE’ (overseas experience), travelling around Europe, experiencing wine and food culture.  From just 174ml of wine per capita in the early 1960s, wine consumption increased to 5.3 litres by the end of the 1970s.  In 2016, the figure stood at 20.2 litres but has remained stagnant for a decade.  (Come on team, get drinking, we have to lift this again – Ed)

Red wines in New Zealand, like whites, are all too often released early and consumed early, meaning there are few older vintages available to purchase and enjoy.  There are relatively few wine collectors and fine dining restaurants with cellars and mature stocks of New Zealand wine and thus some wineries are starting to take responsibility for ageing their wines until they approach their drinking window.  Judy Fowler, owner of Puriri Hills Vineyard in Clevedon, Auckland, which specialises in Bordeaux blends, has a Brunello di Montalcino approach to releasing her reds.  “My late release policy is based on the fact that we attempt to produce Bordeaux-blended wines made in the longstanding traditions of Bordeaux.  The great Bordeaux generally benefit from ageing five to 10 years or longer. Our wines are built to age well. However, we are a small, newer vineyard [established 1998] with perhaps another 300 years to earn the reputation for quality that the grands crus of Bordeaux have.  As such, we do not expect our customers all to want to wait for five or more years to taste our wines at their best, so we do the ageing here at the vineyard before release.”   While Fowler is not alone, most wineries don’t apply the release-when-ready-to-drink policy across the entire range, as it can leave suppliers wine-less and raise the prospect of delisting.

It is difficult to judge the ageability of New Zealand wines with so little precedent. In the past decade, young vines have matured, viticulture has evolved, winemaking has become more refined: a Pinot Noir produced 10 years ago from young vines by winemakers that were still getting to know their site will be quite different today than a current vintage opened in a decade’s time. When asked to provide drinking windows for a recent Central Otago Pinot Noir or Hawke’s Bay Cabernet Sauvignon, it is a case of pinning the tail on the donkey.

However, there’s no doubting the country’s best wines have the components to age gracefully: intensity of fruit, richness of ripe tannins, acidity (and pH), alcohol and magic all play their part in the development of a red wine. In whites, high levels of acidity and flavour precursors elongate their shelf life.

There’s also a small matter of the closure: screwcaps are omnipotent in New Zealand. Although a small but significant number of producers continue to seal their top Bordeaux blends under cork (while putting the rest of their range under screwcap), it is likely that the wines will age more slowly, because of the lower rate of oxygen ingress compared with a natural cork.

What is clear, is that far too many New Zealand wines are being consumed before they are out of nappies. It’s time to let them grow up.