How Long Does Champagne Last Unopened?

 

Have you ever wondered how long champagne can last unopened without losing its signature fizz? It is a question I’m often asked, particularly when a bottle has been carefully put aside for a special occasion, a celebration, or simply the right moment.

The answer is more nuanced than you might expect. Champagne does not have a simple expiry date, and when stored correctly, some bottles can evolve beautifully for many years. Vintage Champagne, prestige cuvées and larger formats can have particularly interesting ageing potential, while storage conditions play an equally important role in preserving freshness, balance and those fine, persistent bubbles.

But what actually happens inside an unopened bottle as the years pass?

Does Champagne Expire?

Unlike many perishable foods, champagne does not suddenly become undrinkable on a particular date. An unopened bottle can continue to evolve in the bottle, with its character changing gradually over time.

How long champagne remains enjoyable depends on a number of factors, including whether it is vintage or non-vintage, the quality and style of the wine, the producer, the bottle format and, importantly, how it has been stored.

A well-stored bottle may develop greater complexity as it ages, while another bottle exposed to heat, light or significant temperature fluctuations may lose freshness much sooner.

So rather than asking whether champagne has an expiry date, it is perhaps more useful to ask: how long can champagne be stored before its character begins to change?

How Long Does Unopened Champagne Last?

There is no single answer that applies to every bottle.

Non-vintage champagne is generally made to express freshness, balance and the house style, and is usually intended to be enjoyed relatively young. Vintage champagne, on the other hand, is produced from a single year’s harvest and can have considerably greater ageing potential, depending on the vintage, producer and conditions.

Prestige cuvées can also be designed with extended ageing in mind.

The important point is that ageing potential is not the same as a guaranteed shelf life. Champagne continues to evolve, and whether an older bottle is at its peak is ultimately a question of the individual wine.

This is part of what makes mature champagne so fascinating. The bubbles are only one part of the experience; with time, the wine can develop greater depth, complexity and tertiary aromas.

Does Champagne Go Flat if It Is Unopened?

One of the most intriguing questions surrounding long-term champagne ageing is what happens to the carbon dioxide responsible for its characteristic effervescence.

An unopened bottle does not simply become flat at a predetermined point. However, the amount of dissolved carbon dioxide can decrease during prolonged ageing, meaning that the way an older champagne behaves once it is poured can be very different from that of a young bottle.

Research into this process has produced some fascinating results.

What the Science Says About Champagne and Ageing

Research by Gérard Liger-Belair and his colleagues examined the evolution of dissolved carbon dioxide in champagne during prolonged ageing. The study looked at 13 vintages that had spent between approximately 25 and 47 years ageing on their lees.

The findings revealed that dissolved CO₂ gradually decreases over very long periods of ageing.

This doesn’t mean that an unopened bottle of champagne suddenly becomes flat after a particular number of years. Rather, it demonstrates that the relationship between time, dissolved carbon dioxide and the pressure inside the bottle is part of champagne’s natural evolution.

And this is where the size of the bottle becomes particularly interesting.

In a recent study published in ACS Omega, researchers measured the dissolved carbon dioxide concentrations in 13 different champagne vintages supplied by Champagne Castelnau. Showing prolonged ageing on lees ranging from 25 to 47 years, the vintages were stored in both standard 750mL bottles and 1.5L magnums, all sealed with the same model of crown cap.

As expected, it was found that the amount of carbon dioxide inside the bottles decreased the longer the bottles aged. For example, the oldest vintage (1974), held in 750mL bottles, lost nearly 80% of its initial carbonation during 47 years of lees ageing.

The researchers also discovered that magnums could preserve bubbles better during prolonged ageing than the same vintages elaborated in standard bottles.

Based on this data, the researchers created a formula to calculate champagne’s shelf-life, predicting that a standard 750mL bottle, having experienced prolonged ageing on lees, would last 40 years before it would go flat when poured into a glass. In contrast, a 1.5L magnum would last 82 years. The 3L Jeroboam was predicted to keep its bubbles for 132 years, after which bubble formation would become impossible after disgorging and service.

So, there you have it! Size truly matters when it comes to maintaining champagne’s trademark sparkle, and this latest study has great implications for both cellar masters and consumers alike.

For the cellar master, choosing larger format bottles ensures that the bubbles are preserved for prestigious cuvées that require extended ageing. As for consumers, opting for bigger bottles means more time to savour the celebration and enjoy the bubbly!

Discover larger format bottles of champagne here

What Happens to Champagne as It Ages?

Champagne’s evolution is about much more than its bubbles.

With time, the wine can develop deeper and more complex aromas and flavours. Fresh fruit can give way to notes of brioche, toast, nuts, honey, dried fruit and pastry, while the texture can become increasingly integrated and the overall character more nuanced.

Vintage champagne is particularly fascinating in this respect because the wine can reveal a different expression of the original vintage as it matures.

This is also why storing a special bottle simply because it is expensive or old is not necessarily enough. The question is whether the wine has been given the conditions it needs to age gracefully.

How to Store Unopened Champagne

If you are keeping champagne for a future occasion, storage matters.

The ideal environment is cool, dark and stable, away from direct sunlight and significant temperature fluctuations. Heat can accelerate the ageing process, while repeated changes in temperature can be detrimental to the wine over time.

Champagne should also be protected from excessive vibration and stored somewhere that maintains reasonably consistent conditions.

A wine cellar is ideal, but the most important principles are consistency, darkness and avoiding extremes of temperature.

And perhaps the most important advice is simply this: don’t buy a special bottle and then forget about it for decades without considering how it is being stored.

How Long Does Vintage Champagne Last?

Vintage champagne generally has greater ageing potential than non-vintage champagne, but there is no universal point at which every vintage bottle reaches its peak.

The vintage itself matters, as does the producer, the cuvée, the bottle format and the conditions in which the wine has been stored.

Some bottles may be extraordinarily rewarding after several decades. Others may be better enjoyed earlier.

This is part of the pleasure of mature champagne: there is no single formula. The wine has its own story, and opening the bottle becomes a moment of discovery.

For me, champagne is also inseparable from the food, seasons and occasions with which it is enjoyed. This is the philosophy behind Celebrating Champagne: A Wine for All Seasons, my book, bringing together 40+ French-inspired recipes, seasonal Champagne pairings, Champagne history, the landscapes of the region and my original Champagne cartography.

Discover Celebrating Champagne: A Wine for All Seasons →

When Should You Open a Bottle of Champagne?

Perhaps the better question is not simply how long champagne can last, but when you should choose to open it.

There is a temptation to keep a beautiful bottle indefinitely, waiting for an occasion important enough to justify opening it. But champagne was made to be enjoyed, and even the most carefully cellared bottle has to make its way from the cellar to the table eventually.

Sometimes the right occasion is a milestone. Sometimes it is a long lunch, a dinner with friends, a celebration or simply a beautiful home cooked meal.

The pleasure is not only in how long the bottle has survived. It is in what happens when it is finally opened.

Santé 🥂