How Long Does an Open Bottle of Wine Actually Last?

Short answer: an opened bottle of red lasts three to five days, white two to three, and sparkling about one - provided you re-seal it and keep it cold. Fortified wines last weeks. Those numbers assume a stopper; a bottle left open on the counter is noticeably worse by the next evening.

Here is what is actually happening, and how to get the longer end of each range.

Why wine goes off after opening

The same oxygen that improves a young red in the first hour keeps working on it afterwards, and eventually it stops being an improvement.

Over a day or two, fruit flavours flatten and the wine tastes duller. After several days, acetic bacteria convert alcohol into acetic acid and the wine drifts toward vinegar. It is a gradual slide, not a cliff - which is why "has it gone off" is usually a matter of taste rather than safety.

Open wine will not make you ill. It just stops being enjoyable.

How long each type lasts

• Sparkling wine - one day, maybe two with a proper sparkling stopper. Bubbles go first.

• Light whites and rosé - two to three days refrigerated.

• Full-bodied whites like oaked Chardonnay - two to three days, sometimes a little more.

• Light reds like Pinot Noir or Beaujolais - two to three days.

• Full-bodied reds like Cabernet, Malbec or Syrah - three to five days.

• Fortified wines like Port, Sherry or Madeira - one to three weeks. The added spirit does the preserving.

The four things that actually extend it

Re-seal it. The single biggest factor. A vacuum stopper removes much of the air above the wine and slows the process considerably. Even pushing the original cork back in beats leaving it open.

Refrigerate it - including reds. Cold slows every reaction involved. A red will taste closed straight from the fridge, so take it out twenty minutes before pouring. This is the tip most people resist and it is the one that works best.

Stand it upright. Less surface area exposed to air than a bottle on its side.

Use a smaller bottle. If you know you will not finish it, decanting the remainder into a clean half-bottle leaves far less air in contact with the wine.

What does not work

Putting it back in the wine rack. Room temperature plus a loose cork is the fastest route to vinegar.

The spoon-in-the-neck trick. A teaspoon in the bottle does nothing. This has been tested repeatedly and it has never worked.

Assuming expensive wine lasts longer. Price has little to do with it. Structure and alcohol matter; the label does not.

How to tell it has gone

Smell it first. Fresh wine smells of fruit. Wine that has turned smells sharp and vinegary, or flat and stewed like cooked fruit. If it smells like nail polish remover, it is finished.

If it smells fine but tastes dull, it is not spoiled - just tired. Perfectly good for cooking, which is a better fate than the sink.

The practical version

Buy a vacuum stopper, keep opened bottles in the fridge, and stop feeling obliged to finish a bottle the night you open it. That combination turns "we should finish this" into a genuinely optional decision, which is the entire point.