Each of us regularly buys chicken eggs, but few people think about how critical the conditions of their maintenance are after purchase. This product, despite the apparent strength of the shell, is an extremely vulnerable biological object. Under certain conditions, pathogenic microorganisms can begin to multiply inside it, which turns healthy food into a dangerous source of infections. That is why the question of how long you can keep raw eggs in the refrigerator in their shell is fundamental to food safety.
The shelf life directly depends on the temperature, humidity and the original quality of the product at the time of purchase. On average, if all standards are observed, chicken eggs can retain their consumer properties in the refrigerator for 3 to 5 weeks. However, these figures are not absolute and require a detailed consideration of the factors affecting safety. In this article we will look at all the nuances that will help you avoid food poisoning and use the product as efficiently as possible.
The main enemy of freshness is heat and temperature changes. If you brought eggs from the store on a hot day and left them on the table for several hours, the process of spoilage inside could already have started. Optimal temperature storage should be stable, without sudden changes that cause condensation on the shell and destroy the protective layer. Understanding these processes will allow you to properly organize the space in the refrigerator.
It is also important to consider that different parts of the refrigerator have different temperatures. The door where we are used to placing trays of eggs is the warmest place where the temperature often fluctuates every time we open it. This is not the best option for long-term storage. Colder shelves in the depths of the chamber will ensure better preservation of the white and yolk, preventing their separation and loss of taste.
Standard shelf life according to GOST and SanPiN
Official regulatory documents clearly regulate how many days raw chicken eggs can be stored in the refrigerator. According to current standards, the shelf life of dietary eggs is 7 days, table eggs of the highest and first categories are up to 25 days, and the second category is up to 12 days at a temperature of 0 to 20 degrees. However, in the conditions of a home refrigerator, where the temperature is stably kept around +2...+4 degrees, these periods can be extended.
⚠️ Attention: The specified periods are relevant only for whole, undamaged eggs that have undergone industrial processing and packaging. If the shell has even microscopic cracks, the shelf life is sharply reduced to 1-2 days, since bacteria gain direct access to the nutrient medium.
When stored in the refrigerator at a temperature of 0 to +5 degrees, raw eggs in the shell can remain edible for up to 90 days if they have been thoroughly washed and treated with special solutions for production (as is often the case with imported eggs). Regular store-bought eggs that have not undergone deep cleaning are recommended to be consumed within 3-4 weeks. Diet eggs, which are considered the healthiest, are best used in the first 5-7 days, since it is during this period that the white is most dense and the yolk is elastic.
It is worth noting that over time Irreversible physical and chemical changes occur inside the egg. Moisture gradually evaporates through the pores of the shell, the air sac (puga) increases in size, and the protein becomes more liquid. This is a natural aging process of the product. If you want to be sure of quality, try not to store eggs for more than a month, even if visually they seem normal.
The influence of temperature on the safety of the product
Temperature is the determining factor influencing the biochemical processes inside the egg. At room temperature (+20...+25°C) the product loses its properties much faster: in one week at room temperature the egg ages the same as in two weeks in the refrigerator. That is why storage outside the refrigeration chamber is permissible only in extreme cases and for a very short period.
It is important to maintain temperature stability in the refrigeration chamber. Sudden changes, for example when you take out the tray, warm it in your hands or under running warm water, and then return it back, lead to the formation of condensation. Moisture destroys the membrane above the shell (cuticle), which serves as a natural barrier to bacteria. Without this protection Salmonella other microorganisms penetrate inside much more easily.
The optimal place for placement is the middle or lower shelf of the refrigerator, where the temperature is most stable. The refrigerator door is the worst place for long-term storage due to constant temperature fluctuations when opened. If you do store eggs in the door, try to use them first, within 1-2 weeks.
| Temperature | Storage location | Shelf life (raw) | Features |
|---|---|---|---|
| +2...+4 °C | Refrigerator shelf | up to 90 days (processed), 25-30 days (regular) | Ideal conditions, stable cold |
| +5...+10 °C | Refrigerator door | up to 25 days | Possible differences when opening |
| +15...+20 °C | Cool pantry | up to 14 days | Acceptable for short-term storage |
| +20...+25 °C | Kitchen table | up to 7 days | Rapid loss of quality, risk of spoilage |
How to properly store eggs in the refrigerator
Proper organization of storage is the key to a long life of the product. Most manufacturers pack eggs in cardboard or plastic trays, and this is no accident. Such containers protect the product from foreign odors, which are easily absorbed through the pores of the shell, and prevent mechanical damage. Cardboard trays They also avoid the formation of condensation better than open plastic.
Eggs should be stored with the blunt end facing up. It is in this part that the air chamber (puga) is located. In this position, the yolk is in the center of the white and does not touch the air sac, which prevents it from drying to the shell and spoiling. If you place an egg with the pointed end up, the yolk can float and come into contact with air, which will speed up spoilage.
☑️ Rules for ideal storage
It is not recommended to store eggs near foods that have a strong odor, such as smoked meats, fish, citrus fruits or spices. The shell is highly permeable, and odors can change the taste of the white and yolk. Also, avoid being near raw meat to avoid cross-contamination with bacteria if the packaging is damaged.
Methods for checking freshness at home
Even if the expiration date on the package has not yet expired, it is always a good idea to check the freshness of the egg before using it, especially if it has been in the refrigerator for several weeks. There are several proven ways to determine the condition of a product without opening it. The simplest and most reliable of them is the water test.
Dip the egg into a glass of cold water. If it lies horizontally on the bottom, the product is absolutely fresh. If the blunt end floats up, but the egg is still on the bottom, it is about 1-2 weeks old and is suitable for hard-boiling or baking. If the egg floats to the surface of the water, it must be thrown away, since a lot of gas has accumulated inside, indicating decay.
⚠️ Attention: A floating egg means that the air chamber inside has increased significantly due to the evaporation of moisture and the release of gases by bacteria. Consumption of such a product can lead to severe food poisoning.
The second method is to check for light transmission (ovoscopy). At home, you can use a bright flashlight. The size of the air pocket is clearly visible in the light: in a fresh egg it is no more than 4-7 mm. If the pocket takes up a third of the egg or more, the product is old. Also, there should be no visible blood inclusions or dark spots inside the protein.
What to do if you break an egg and doubt its freshness?
If you notice an unpleasant hydrogen sulfide odor (the smell of rotten eggs) when breaking, immediately throw away the contents and thoroughly wash the container with a disinfectant. If the smell is normal, but the white is very liquid and spreads, and the yolk is flat, the egg is old, it can only be used for full heat treatment (baking, where the temperature is above 100°C), but it is better not to risk it.
Is it possible to wash eggs before storing
This question causes the most controversy. On the one hand, the shell may contain traces of droppings or feathers, which is unhygienic. On the other hand, industrial washing of eggs in a factory is accompanied by a special treatment that creates a protective film. At home, washing under the tap washes away the natural protective layer (cuticle), leaving the shell vulnerable.
If you bought eggs at the farmer's market and see that they are dirty, it is better to wipe them with a dry or slightly damp cloth immediately before use. If the contamination is strong and requires washing, then you need to wash the eggs immediately before cooking, and not before putting them in the refrigerator. After washing, you cannot store them for a long time - the period is reduced to 2-3 days.
There is an opinion that washing with hot water opens the pores and bacteria are sucked inside. This is true if the temperature difference is large. Therefore, if you do decide to wash a batch of eggs for storage (for example, to free up space in the trays), use water at room temperature or slightly warm, but not hot, and be sure to wipe them dry with a paper towel.
Signs of a spoiled product
The ability to recognize a spoiled egg is a skill that will save you from many problems. In addition to the water test, there are visual and olfactory signs. Rotten protein acquires a greenish or pinkish tint, becomes cloudy and stringy. The yolk may be mixed with the white or have an unnatural color.
The most obvious sign is the smell. A rotten egg has a characteristic, incomparable smell of hydrogen sulfide. It appears immediately when broken, but sometimes can be felt even through the shell if you bring it to your nose. Salmonellosis is not the only danger; old eggs may contain other toxins that cause gastrointestinal upset.
If, during cooking, an egg in the shell bursts and the white flows out in rags, this may also indicate that the product has begun to deteriorate or has been frozen. When boiled, a fresh egg behaves predictably, the white curls into a tight lump.
FAQ: Frequently asked questions
Is it possible to freeze raw eggs in their shells?
No, you cannot freeze eggs in their shells. When freezing, the liquid inside expands and the shell breaks. In addition, low temperatures change the structure of the protein, making it jelly-like after defrosting. If you need to preserve eggs for a long time, you can freeze them without the shell by lightly whisking the white and yolk together in an airtight container.
Why does the yolk stick to the shell?
This is a sign that the egg is not fresh. Over time, the white becomes more runny and loses its ability to hold the yolk in the center. The yolk floats and dries to the inside of the shell. It is better to use such eggs only for dishes with full heat treatment or throw them away.
How does shell color affect shelf life?
The color of the shell (white or brown) depends on the breed of chicken and does not affect shelf life or taste. The rules and storage periods are the same for eggs of any color. The main thing is the integrity of the shell and compliance with the temperature regime.
Can eggs with cracks be used?
Eggs with cracks in the shell cannot be stored. Bacteria penetrate inside almost instantly. Such an egg can only be used immediately after a crack is detected, having subjected it to thorough heat treatment (hard-boiled, baked), but it is better to play it safe and throw it away.