Does diet coke go bad?

In this brief guide, we will discuss the following question, “does diet coke go bad ?” and other queries related to this topic.

Does diet coke go bad? 

Yes, diet coke does go bad with time especially since its taste might change and will become flat. However, on the coke can there is a stamped “best-by-date” so unopened diet coke can last for about an extra six to nine months past the expiration date.

Moreover, to keep your coke for extra months post-expiration day you need to store it in an appropriate environment, far from any direct sunlight or heat source. Thus, the best place to store your coke is in your pantry at room temperature.

In addition, the packaging of the coke should not be damaged in order to keep the product’s quality for a longer time.

Furthermore, you can store your diet coke in the fridge, however, refrigerating your diet coke will not increase its shelf life since it can last for six to nine months post-expiration date.

On the other hand, once you open your diet coke make sure to consume it within one day because its taste will fade out and it will be tasteless. However, in some cases, you might store your opened diet coke in the fridge for three to four days but you will risk losing its quality.

The ingredients of the coke are water, sugar, artificial sweeteners which are aspartame in the case of diet coke, and artificial flavors and colors. The long shelf life of these ingredients is the reason behind the long expiry date of the coke.

Can you freeze soda?

Yes, you can freeze soda but it is not a very good idea to do it and it might have many risks. However, cold and frozen soda is better enjoyed than warm coke.

Moreover, freezing soda is risky because under low temperatures the water within the soda will expand. This expansion will lead to high pressure inside the can. Also, coke is a carbonated beverage so it does contain gasses. The liquid expansion and the gasses will increase the risk of the bottle or can explode.

How long do unopened diet soft drinks last at room temperature?

As mentioned earlier, an unopened diet soft drink can last for an extra six to nine months past its expiry date. Because when the can is well sealed, it will be in less contact with the air which in turn reduces the risk of carbonation and the loss of the gas inside your drink.

However, if the packaging is damaged the shelf life of your diet coke will be less and it is advisable to discard it in such a case.

What is the best way to store a diet coke?

The best place to store your diet coke is in your pantry which is a dry and cool place. However, you can still store your diet coke in the refrigerator. Because it is better to serve your coke chilled.

Moreover, once you open the diet coke can put it in the refrigerator for a maximum of one day. In addition, to preserve its quality, make sure to well seal the bottle or the can. So, if it is an aluminum can, pour the coke into a plastic bottle and make sure that its cap is well sealed.

Furthermore, if you want to keep your coke in its original can, bring a plastic wrap and cover the lid. This is not a very good method to keep your coke fresh but it might work. One other method is to squeeze your bottle. By squeezing your bottle you reduce the air within the product.

Hence, if you keep your coke open at your counter overnight, it is safe and fine to drink it. However, its taste will not be the same and it will turn bad. So, it is a matter of food quality, not safety.

How to tell if diet coke is bad?

First of all, one of the major signs of spoilage of unopened diet coke is the damage in the packaging, can, or bottle. So, once you see any leakage consider throwing your coke. In addition, before drinking a coke that has passed its expiry date check for any sign of spoilage.

Many signs can indicate the spoilage of a product such as the smell, the color, and the taste. Moreover, smell and color alteration might not be clear, so consider tasting your coke if you think it is bad. So, if it has an unpalatable taste, throw it away.


In this brief guide, we discussed the following question, “does diet coke go bad?” and other queries related to this topic.


Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.