You’ve just separated some egg whites for a recipe and you’re wondering if the leftover bowl can sit on the counter or go in the fridge while you finish the bowl in the kitchen. Or if you have a carton of liquid egg whites and want to know exactly how much time is left after opening. Do egg whites need to be refrigerated?
Short answer: Yes, always. Egg whites are perishable from the moment they leave the shell or carton closed. There is no safe way to store egg whites at room temperature for more than 2 hours. Separated fresh or from a commercial carton, egg whites should be refrigerated immediately and used quickly.
To see how perishable foods compare in shelf life, visit our The Complete Guide to Food Storage.
To take the keys
- All egg whites should be chilled. There are no exceptions of any kind, fresh or carton.
- The 2 hour rule is firm: Egg whites left at room temperature for more than 2 hours should be discarded.
- Separated egg whites: 2 to 4 days in the refrigerator in a closed container.
- Cardboard egg whites (opened): 3 to 7 days after opening, according to USDA guidelines. Follow the label.
- Cardboard egg whites (unopened): refrigerate and use until the printed use-by date, which can be weeks or months after purchase. Costco’s Kirkland Signature cartons typically have a use-by date of one month. Keep sealed and cold until ready to open.
- Freezing is the best option for egg white you cannot use it within 4 days. They are frozen for up to 12 months with minimal loss of quality.
Why Egg Whites Always Need Refrigeration
Raw egg whites are high in protein and moisture, making them an excellent environment for bacteria to grow at room temperature. The main concern is Salmonella, which is FDA notes can contaminate the egg white from inside the egg before the shell is formed without significantly affecting the appearance or smell of the white.
When egg whites are inside a whole shell, they have a natural protection of proteins like lysozyme that slow down the growth of bacteria. Once separated from the shell or removed from a closed carton, these protections disappear or are reduced. Refrigeration to 40°F or below is the only reliable way to slow bacterial growth to safe levels.
The 2-hour rule for egg whites
This window is shorter than you think
The FDA 2-hour rule applies to egg whites at all stages: separated raw whites on the counter, a carton left out, or a cooked egg white sitting on a table. After 2 hours at room temperature, egg whites have been in the bacterial danger zone (40°F to 140°F) long enough to discard. In temperatures above 90°F, such as during outdoor summer events, this window drops to one hour.
The 2-hour window is applied cumulatively, not per session. If you boiled the egg whites for an hour while you cook them, then put them back in the fridge and took them out for 30 minutes, they’ve now used their safe window for 90 minutes. It does not reset by returning it to the refrigerator.
Reheating or cooking egg whites that have been left out too long does not make them safe. Some bacterial toxins produced during exposure at room temperature are heat stable and persist at cooking temperatures.
How long do frozen egg whites last?
| The type | the refrigerator | the freezer |
|---|---|---|
| Separated raw egg whites | 2 to 4 days | up to 12 months |
| Liquid egg white cartons (unopened) | In the box until the use-by date (often months after purchase) | up to 12 months |
| Carton of liquid egg white (open) | 3 to 7 days after opening | up to 12 months |
| Boiled egg white | 3 to 4 days | Up to 3 months |
based on USDA FoodKeeper guidelines and USDA FSIS egg product handling guidelines. USDA FSIS defines products with no expiration date as 3 days after opening; Cartons with a use-by date can last up to 7 days after opening according to the manufacturer’s instructions. Always check for signs of deterioration before use.
The difference between cardboard whites and cool separate whites
Pasteurized does not mean after opening
Liquid carton egg whites (AllWhites, Egg Beaters Pure Egg Whites, Kirkland 100% Egg Whites) are pasteurized, which kills pathogens including Salmonella. This makes them safer to consume raw in protein shakes and other uncooked applications. But pasteurization breaks down some of the natural antimicrobial proteins in the egg white that provide natural protection.
When you open the carton and break the sterile seal, the pasteurized whites are immediately exposed to airborne bacteria and environmental contaminants. From that moment, the 3 to 7 day window will begin to count. Many people think pasteurized means it lasts longer after opening. The reverse is often the case: an egg white in a tightly closed glass container, handled with care, can last for 4 days. An open carton is more vulnerable because the large volume of whites is exposed to the air each time you pour.
Rule of thumb: write the opening date on the carton. If you can’t finish within 7 days, freeze what’s left before that window closes.
Bringing egg whites to room temperature safely
Many baking recipes call for room temperature egg whites for better volume when whipped. The right way to do this is not to leave it on the table for hours, but to take it out of the fridge 20 to 30 minutes before you plan to enjoy it. This is enough time to get rid of the cold without entering the danger zone. Set a timer and return unused egg whites to the refrigerator immediately after you’re done.
For French macarons and other meringue-based recipes, “seasoned” egg whites work best. Separate the egg whites 24 to 72 hours before baking, store covered in the refrigerator and bring to room temperature for 30 minutes before whipping. This loosens the structure of the proteins and creates a more stable meringue.
Good storage practices
How to store egg whites properly
Refrigerate immediately after separating. Do not leave a bowl of egg whites on the counter while you continue cooking. Place in a sealed container and refrigerate as soon as you separate the refrigerator.
Use a clean, airtight container. Glass containers with tight lids are ideal. Egg whites absorb refrigerator odors easily, and even an uncovered container allows flavor transfer from other foods. Always use clean, dry containers and utensils.
Store at the back of a main shelf. A shelf behind the main refrigerator maintains a consistently cold temperature. The door changes with each opening. The egg white is on the back, not the door.
See also
Label with date and number. A bowl of egg whites looks the same on day 1 and day 3. Label the date you separated and how many egg whites are in the container. A large egg white is about 2 tablespoons.
Freeze within 4 days if not using. Ice cube trays with one blank in each compartment are the most practical method of freezing. Transfer frozen cubes to a sealed bag once solid. Label with number and date.
Do not refreeze thawed egg whites. After thawing frozen egg whites in the refrigerator, use within 24 hours. Do not return to the freezer.
Bring properly to room temperature. Remove from the refrigerator 20 to 30 minutes before. Do not leave at room temperature longer than necessary and always use within 2 hours of removing from the refrigerator.
Recipes that use egg whites
- French Macarons: egg white aging is a key technique that gives macaroni feet and stable shells
- Keto Raspberry Lemon Waffles: properly beaten cold egg whites folded into the batter creates a significantly lighter waffle
- Sugar Free Cookies: A simple egg white glaze gives these cookies a crisp, clean finish
- Pre-Workout Smoothie: Pasteurized carton egg whites mix well into smoothies to add pure protein
Frequently Asked Questions
I left the egg whites out overnight by mistake. Are they safe yet?
no Egg whites left at room temperature overnight have exceeded the FDA’s 2-hour safe window by many hours. Discard Even though they look normal and smell normal, the growth of bacteria in liquid protein-rich egg whites at room temperature is real and cannot be reversed by cooling or cooking. Some bacterial toxins are heat stable and survive cooking temperatures. This applies to both fresh separated whites and liquid carton whites.
Can I use egg whites straight from the fridge for whipping?
You can, but if they are slightly warmed they will beat better. Cold egg whites take longer to whip and create slightly less volume because residual yolk contamination molecules are more active at cold temperatures and can prevent foaming. For best results, remove the egg whites from the refrigerator 20 to 30 minutes before whipping. Make sure your bowl and mixer are completely clean and free of grease, which will prevent the egg whites from whipping properly.
How do I know how many egg whites are in my bowl?
A large egg white is approximately 2 tablespoons or 30 milliliters. If you throw away leftover egg whites without counting, measure by spoonfuls: 2 tablespoons is one large egg white. Label the container with the count so you know exactly how many you have for your next recipe without opening and measuring again. Most recipes specify by counting the egg whites, so following this from the start avoids the guesswork of converting the volume later.
Further reading
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