You’ve just separated some egg whites for a recipe and are wondering if the leftover bowls can stay on the counter while you finish cooking, or if they should go straight to the refrigerator. Or you have a carton of liquid egg whites and want to know how long it lasts after opening. Do egg whites need to be refrigerated?
The short answer: Yes, always. Egg whites are perishable as soon as they come out of the shell or sealed carton. There is no safe way to store egg whites at room temperature beyond 2 hours. Whether freshly separated or from a commercial carton, egg whites should be refrigerated immediately and used promptly.
For a complete look at how perishable foods compare in terms of shelf life, visit our Complete Guide to Food Storage.
Key takeaways All egg whites should be refrigerated. No exceptions for any type, charge or carton. The 2 hour rule is firm: egg whites left at room temperature for more than 2 hours should be discarded. Freshly separated whites: 2 to 4 days in the refrigerator in an airtight container. Egg whites in carton (opened): 3-7 days after opening, per USDA guidelines. Follow the label. Cardboard egg whites (unopened): refrigerate and use before the printed use-by date, which may be several weeks to several months after purchase. Kirkland Signature cartons from Costco generally have an expiration date several months out. Store sealed and cold until you are ready to open. Freezing is the best option for egg whites, you cannot use them within 4 days. They freeze for up to 12 months with minimal loss of quality. Why Egg Whites Always Need to Be Refrigerated Raw egg whites are high in protein and moisture, making them a great environment for bacterial growth at room temperature. The main concern is salmonella, which the FDA The notes can contaminate egg whites from inside the egg even before the shell forms, without visibly affecting the appearance or smell of the white.
When egg whites are in an intact shell, they have some natural protection against proteins like lysozyme that slow bacterial growth. Once separated from the shell or removed from a sealed carton, these protections disappear or diminish. Refrigeration at 40°F or lower 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’s 2-hour rule applies to egg whites at every stage: raw whites separated on the counter, carton left out, or cooked egg whites placed on a serving table. After 2 hours at room temperature, the egg whites have remained in the bacterial danger zone (40°F to 140°F) long enough that they should be discarded. At temperatures above 90°F, such as during outdoor summer events, this window drops to 1 hour.
The 2 hour window applies cumulatively and not per session. If the egg whites sat for 1 hour while you cooked, then returned to the refrigerator, then came out again for 30 minutes, they have now used 90 minutes of their safety window. It is not reset by putting them back in 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 to room temperature are heat stable and survive cooking temperatures.
How long do refrigerated egg whites last? Type Fridge Freezer Freshly separated raw egg whites 2 to 4 days Up to 12 months Liquid egg whites in carton (unopened) Until the expiration date indicated on the box (often several weeks or even months after purchase) Up to 12 months Carton of liquid egg whites (opened) 3 to 7 days after opening Up to 12 months Cooked egg whites 3 to 4 days Up to 3 months Based on USDA Food Guardian USDA FSIS egg product handling guidelines and guidelines. The USDA FSIS specifies 3 days after opening for products without an expiration date; cartons with a use-by date may take up to 7 days after opening, according to manufacturer’s guidelines. Always check for signs of deterioration before use.
The main difference between cardboard blanks and freshly separated blanks Pasteurized does not mean longer after opening Liquid egg whites in cartons (AllWhites, Egg Beaters Pure Egg Whites, Kirkland 100% Egg Whites) are pasteurized, which kills pathogens including salmonella. This makes them safer for raw consumption in protein shakes and other uncooked applications. But pasteurization also destroys some of the natural antimicrobial proteins in raw egg white that provide natural protection.
Once you open the carton and break its sterile seal, pasteurized whites are immediately exposed to airborne bacteria and environmental contaminants. From this point on, the 3-7 day window begins to count. Many people think that pasteurized means it lasts longer after opening. The opposite is often true: a freshly separated egg white in a tightly closed glass container and handled with care can last a full 4 days. An open carton is more vulnerable because the large volume of whites is exposed to air every time you pour it.
The practical rule: write the opening date on the box. If you can’t complete it within 7 days, freeze what’s left before this window closes.
Bring egg whites to room temperature safely Many baking recipes call for room temperature egg whites for better volume when whipping. The correct way to do this is not to leave them on the counter for hours but to remove them from the refrigerator 20 to 30 minutes before whisking. This is enough time to relax without entering the danger zone. Set a timer and return any unused whites to the refrigerator immediately after finishing.
For French macarons and other meringue-based recipes, “aged” egg whites work best. Separate your whites 24 to 72 hours before baking, store them lightly covered in the refrigerator and bring to room temperature for 30 minutes just before whisking. This loosens the protein structure and produces a more stable meringue.
Best Storage Practices How to Store Egg Whites Properly Refrigerate immediately after separation. Don’t leave a bowl of egg whites on the counter while you continue cooking. Transfer to a sealed container and refrigerate as soon as you’re done separating.
Use a clean, airtight container. Glass containers with tight-fitting lids are ideal. Egg whites easily absorb refrigerator odors, and even a poorly covered container allows flavor transfer from other foods. Always use clean, dry containers and utensils.
Store it at the bottom of a main shelf. The back of a main refrigerator shelf maintains the most consistent cold temperature. The door fluctuates each time it is opened. Egg whites belong in the back, not the door.
See also
Label with date and count. A container of egg whites looks the same on the first and third day. Label with the date you separated them and the number of blanks in the container. One large egg white is about 2 tablespoons.
Freeze if not using within 4 days. Ice cube trays with one blank per compartment are the most convenient freezing method. Transfer the frozen cubes to a sealed bag once solid. Label with count and date.
Do not refreeze thawed egg whites. Once the egg whites are thawed in the refrigerator, use them within 24 hours. Do not put them back in the freezer.
Bring properly to room temperature. Remove from the refrigerator 20 to 30 minutes before whisking. 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 macaroons: aging with egg white is the key technique that gives macarons their signature foot and stable shell Keto Raspberry Lemon Waffles: cold egg whites whipped well and incorporated into the batter create a noticeably lighter waffle Sugar Free Sugar Cookies: A simple egg white glaze gives these cookies a crisp, crisp finish Pre-workout smoothie: Pasteurized carton egg whites blend perfectly into smoothies for a clean protein boost Frequently Asked Questions I left the egg whites out overnight by mistake. Are they still safe? Egg whites left at room temperature overnight exceeded the FDA’s 2-hour safety window by several hours. Throw them away. Even though they look and smell normal, room temperature bacterial growth in protein-rich liquid egg whites is real and cannot be reversed by refrigeration or subsequent cooking. Some bacterial toxins are heat stable and survive cooking temperatures. This applies to both freshly separated whites and liquid cardboard whites.
Can I use egg whites straight from the fridge for whipping? You can, but they will whip better if slightly warmed. Cold egg whites take longer to whip and produce slightly less volume, because fat molecules from any residual yolk contamination are more active at cold temperatures and can inhibit foaming. For best results, remove egg whites from the refrigerator 20 to 30 minutes before whisking. Make sure your bowl and whisk are perfectly clean and free of any grease, which will also prevent the whites from whipping properly.
How do I know how many egg whites are in my container? A large egg white is about 2 tablespoons or 30 milliliters. If pouring leftover egg whites into a container without counting, measure by tablespoons: every 2 tablespoons equals one large egg white. Label the container with the number so that you s know exactly how much you have for your next recipe without opening it or measuring it again. Most recipes specify egg whites by number, so tracking from the beginning takes the guesswork out of converting volume later.
Further reading Do egg whites go bad? Do eggs go bad? Does cream cheese go bad? Complete Guide to Food Storage Better Living may earn commissions through affiliate links and may occasionally offer sponsored or partnered content. If you make a purchase through our links, we may receive a small commission at no cost to you.