Does Yogurt Go Bad?

There was this big sale, and you stocked up on yogurt.

It’s been two weeks since, and now you realize that you were a little too ambitious. You’ve bought too many containers and have a few yogurts nearing the date on the label. Does yogurt go bad?

Or maybe you use yogurt mainly for cooking.

A typical recipe uses only half or a third of the container, and you’re often left with a half-open yogurt. You’re not sure how long you can store the rest, or if freezing the leftovers is any good.

If some of these questions sound familiar, this article is for you. In it, we go through storage, shelf life, and going bad of all kinds of yogurts.

Yogurt in hand
Yogurt container in hand

How To Store Yogurt

Like similar products such as kefir or sour cream, you should store yogurt in the fridge. That’s true for pretty much all kinds of yogurt, including plain natural, Greek-style, and flavored ones.

Once you open the package, make sure you cover it tightly. Without a cover, it starts to dry out, and it might pick up any strong odors from the fridge.

If you plan on using the leftovers within a day, using the aluminum top of the package is usually enough. But if you expect the rest to sit in the fridge for a few days, pour the yogurt in a mason jar or a small airtight container. This way, it will retain freshness for longer.

Leftover yogurt in a container
Leftover yogurt in a container

Time and time again I’ve seen questions like “how long can yogurt be out of the fridge without going bad?“. There isn’t a right answer to such an question, because it’s impossible to tell.

Sometimes it can be an hour, sometimes a few hours. It depends on the temperature it sits in, and so on.

All in all, try to limit the time yogurt is outside the fridge to the minimum. That means it shouldn’t sit for hours in the trunk with other foods if it’s hot outside.

Tip

In the summer, try picking up all the refrigerated items right before you go to checkout. This minimizes how long they stay at room temperature.

Yogurt container sealed with aluminum foil
Yogurt container sealed with aluminum foil and a rubber band

Can You Freeze Yogurt?

There’s this ongoing debate on whether or not you can freeze yogurt, and the responses are all over the place.

In short, you can freeze yogurt, but just like buttermilk or other dairy products, it will separate once thawed. Stirring it will help a bit with getting some of its texture back, but don’t expect miracles here.

If you need to freeze yogurt, make sure you use it in cooked or baked dishes. In such dishes, the changed texture doesn’t matter all that much.

Tip

Thicker yogurts generally freeze better, so you might have more success with freezing Greek-style yogurt than with the plain one.

Ingredients for garlic sauce
Ingredients for garlic sauce gathered

Check out our article on freezing yogurt for more details.

How Long Does Yogurt Last

Pointing out the exact shelf life of yogurt is difficult. There are a few things that come into play here.

First, it’s the type of yogurt (plain, Greek, Icelandic, flavored, reduced-fat) that matters.

Second, it’s the ingredients and whether or not it contains preservatives.

The third factor, and one that you have limited information about or control over, is how it was stored before it got to the store. If your yogurt was mishandled before it got to the supermarket’s fridge, it could spoil early.

Generally, the first thing to do is to check the date on the label. Usually, it’s a sell-by date. That date informs you how long the store can keep the product on the shelves.

That also means that the dairy product should retain freshness for a couple of days longer. In case of yogurt, it’s usually up to a week past that date.

Warning

Yogurt can just as easily be spoiled a day past its date or even earlier, especially if it’s free of preservatives.

Opened yogurt container
Opened yogurt container

Once you open the package, you should use it within a week. That is, of course, if you store it properly.

While a week sounds nice, to get the best quality I recommend using the yogurt within 3 to 5 days tops. That’s, of course, a general estimate and will vary for different styles and brands.

Let’s sum it up.

All kinds of yogurt last for up to a week past the date on the label. After opening, you should finish any leftovers within five to maybe seven days. If your yogurt is past its date, it’s best to finish it soon after opening.

 Fridge
Yogurt (unopened)Sell-by + 1 week
Yogurt (opened)5 – 7 days

Please note that the periods above are rough estimates and dairy products can easily spoil way earlier.

Garlic sauce before stirring
Garlic sauce before stirring

How To Tell If Yogurt Is Bad

Signs that your yogurt has gone bad include:

  • Mold, other organic growth, or discolorations. If you notice some funny business going on on the surface of your yogurt, it’s time for it to go.
  • Texture change. If there’s lots of water on the surface, and the rest is chunky instead of smooths, you know it’s bad.
  • Sour smell. Check if your yogurt doesn’t smell stale or sour instead of fresh.
  • Off taste. If your yogurt, despite looking and smelling okay, tastes funny or sour, it’s past its prime.

Last but not least, if your half-open yogurt sits in the fridge for more than a week, or an unopened one is a couple of weeks past the date on the label, discard it.

Same thing if you left it at room temperature overnight by accident.

In either case, it’s better to cut your losses and don’t risk foodborne illness.

Yogurt container closeup
Yogurt container closeup

If there’s some liquid on top of the yogurt, fear not. It’s whey that has separated, and you can stir it in back in. The process is natural and not harmful in any way.

Info

Separation of whey happens most often in preservative-free yogurts.