You're probably familiar with the old adage, "Don't leave food out for more than two hours." But what about yogurt? Surely this delicious, creamy treat must have a shorter shelf life, right? After all, it's made with milk, and we all know that milk goes bad pretty quickly. So how long can yogurt sit out before it becomes a breeding ground for bacteria? Let's find out.

Why Does Yogurt Go Bad?

To understand why yogurt goes bad, we need to first understand what yogurt is. Yogurt is made by adding bacterial cultures to milk and allowing the mixture to ferment. This fermentation process transforms the lactose in milk into lactic acid, which gives yogurt its tangy flavor and thick texture. Lactic acid also acts as a natural preservative, which helps to keep yogurt fresh for longer than milk alone.

So why does yogurt go bad if it's already packed with preservatives? The answer lies in the fact that yogurt is a perishable food made with dairy products. Dairy products are highly susceptible to bacterial contamination, and once bacteria gets into the mix, it can quickly multiply and spoil the entire batch of yogurt.

How Long Can Yogurt Sit Out?

So how long can you leave yogurt out before it goes bad? Unfortunately, there is no hard and fast rule. The answer depends on a number of factors, including the type of yogurt, the temperature of the room, and how long the yogurt has been sitting out.

In general, plain yogurts tend to last longer than flavored yogurts because they don't contain any added sugars or fruit purees that can act as a food source for bacteria. Additionally, yogurts that have been stored at a temperature below 40 degrees Fahrenheit will last longer than those that have been stored at higher temperatures. And finally, yogurts that have been sitting out for shorter periods of time will last longer than those that have been sitting out for longer periods of time.

The yogurt expiration experiment:

A friend bought a tub of yogurt, and then left it sitting out on his counter for 24 hours. Then he repeated the experiment, but this time he left it out for 48 hours. And finally, he left it out for 72 hours. Here's what he found:

After 24 hours: The yogurt was starting to separate, but otherwise was still fine to eat. It wasn't quite as delicious as when he had first bought it, but it wasn't bad.

After 48 hours: The yogurt was starting to get a bit of a sour smell, but again, was still fine to eat. The taste was noticeably different from when he had first bought it, but it wasn't unpleasant.

After 72 hours: The yogurt was starting to form mold, and the taste was very sour. At this point, it was definitely not safe to eat.

With all of these factors to consider, it's hard to give a definitive answer as to how long your yogurt will last before going bad.


So there you have it: the surprising truth about how long yogurt can sit out. While there is no one-size-fits-all answer to this question, as a general rule of thumb, you should aim to consume your yogurt within two hours of taking it out of the fridge. This will help to ensure that your yogurt is fresh and flavorful when you eat it.

Make your own tasty yogurt:

Ok, everyone, it's time to get up and get motivated! Yogurt is essential to a balanced breakfast diet and there's no better way to get your yogurt fix than with one of these amazing Yogurt Makers.  These machines make yogurt-making easy, fast and fun! So what are you waiting for? Get up, get moving and get yourself a Yogurt Maker today!