You’ve just separated some egg whites for a recipe and are wondering whether the bowl of leftovers can sit on the counter while you cook, or whether it needs to go straight into the fridge. Or you have a carton of liquid egg whites and you want to know how long it stays good after opening. Do egg whites need to be refrigerated?
Short answer: Yes always. Egg whites get destroyed as soon as they come out of the shell or sealed container. There is no safe way to store egg whites at room temperature for more than 2 hours. Whether they are freshly separated or from a commercial carton, egg whites should be refrigerated and used quickly.
For a complete overview of how perishable foods compare on shelf life, visit our complete food storage guide.
key takeaways
- All egg whites should be refrigerated. No exceptions for any type, fresh 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: Refrigerated in a sealed container for 2 to 4 days.
- Carton Egg Whites (Open): According to USDA guidance, 3 to 7 days after opening. Follow the label.
- Carton Egg Whites (unopened): Refrigerate and use by the printed use-by date, which can be several weeks to months from purchase. Costco’s Kirkland Signature cartons usually have a use-by date written in months. Keep sealed and chilled until you are ready to open.
- Freezing is the best option You cannot use egg whites within 4 days. They remain frozen for up to 12 months with minimal quality loss.
Why do egg whites always require refrigeration?
Raw egg whites are high in protein and moisture, making them an excellent environment for bacterial growth at room temperature. The primary concern is Salmonella, which fda NOTE The inside of egg whites can be contaminated before the eggshell is formed, without affecting the appearance or smell of the whites.
When egg whites are inside an intact shell, they get some natural protection from proteins like lysozyme that slow down the growth of bacteria. Once separated from the shell or removed from the sealed carton, those protections are lost or diminished. The only reliable way to slow bacterial growth to safe levels is refrigeration at 40°F or lower.
2 hour rule for egg whites
This window is smaller than you think
The FDA’s 2-hour rule applies to egg whites at every stage: raw separated whites on the counter, a carton that has been left out, or cooked egg whites sitting on the serving table. After 2 hours at room temperature, the egg whites have been in the bacteria danger zone (40°F to 140°F) long enough that they should be discarded. At temperatures above 90°F, such as at outdoor summer events, that time is reduced to 1 hour.
The 2-hour period applies cumulatively, not per session. If the egg whites were left out for 1 hour while cooking, then went back into the fridge, then came out for another 30 minutes, they have now used up 90 minutes of their safe window. Returning them to the refrigerator does not reset this.
Reheating or cooking egg whites that have been left out for 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 | refrigerator | freezer |
|---|---|---|
| freshly separated raw egg whites | 2 to 4 days | up to 12 months |
| Carton Liquid Egg Whites (Unopened) | Use by date on the carton (often several weeks to months from purchase) | up to 12 months |
| Carton Liquid Egg Whites (Open) | 3 to 7 days after opening | up to 12 months |
| cooked egg whites | 3 to 4 days | up to 3 months |
based on usda foodkeeper Guidance and USDA FSIS Egg Product Management Guidance. USDA FSIS specifies 3 days after opening for products without an expiration date; Containers with use by dates can be stored for up to 7 days after opening according to manufacturer’s guidance. Always check for signs of spoilage before using.
Main Differences Between Carton White and Fresh-Isolate White
Pasteurized does not mean longer shelf life after opening
Carton liquid egg whites (AllWhites, Egg Beaters Pure Egg Whites, Kirkland 100% Egg Whites) are pasteurized, which kills pathogens, including Salmonella. This makes them safe for raw consumption in protein shakes and other raw applications. But pasteurization also breaks down some of the natural antimicrobial proteins in raw egg whites that provide natural protection.
Once you open the carton and break its sterile seal, pasteurized white goods are immediately exposed to airborne bacteria and environmental contaminants. From that point, the 3 to 7 day period starts counting. Many people assume pasteurized means it lasts a long time after opening. The opposite is often true: freshly separated egg whites in a well-sealed glass container, when handled carefully, can last up to 4 full days. An opened carton is more unsafe because a large amount of the white is exposed to air every time you pour it.
Practical rule: Write the opening date on the carton. If you can’t finish it within 7 days, freeze what’s left before the 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 them out on the counter for hours, but to remove them from the refrigerator 20 to 30 minutes before you plan to whip them. This is enough time to get relief from the cold without entering the danger zone. Set a timer and return any unused whites to the fridge immediately after you’re done.
For French macarons and other meringue-based recipes, “old” egg whites perform better. Separate your whites 24 to 72 hours before baking, keep covered in the refrigerator, and let sit at room temperature for 30 minutes just before whipping. This loosens the protein structure and produces a more stable meringue.
Best Storage Practices
How to store egg whites correctly
Keep it in the refrigerator immediately after separating. Don’t leave the bowl of egg whites on the counter while you continue cooking. Transfer to a sealed container and refrigerate immediately once separated.
Use a clean, airtight container. Glass containers with tight-fitting lids are ideal. Egg whites readily absorb refrigerator odors, and even a loosely covered container allows flavors to transfer to other foods. Always use clean, dry containers and utensils.
Store behind main shelf. The back of the main refrigerator shelf maintains the most consistent cold temperature. The door changes with every opening. The egg white is on the back, not the door.
See also
Label with date and count. A container of egg whites looks the same on day one and day three. Label the date you separated them and how much white is in the container. One large egg white is equivalent to about 2 tablespoons.
Freeze if you will not use within 4 days. One white ice cube tray per compartment is the most practical freezing method. Transfer the frozen cubes to a sealed bag once they are solid. Label with count and date.
Do not refreeze thawed egg whites. Once frozen egg whites thaw in the refrigerator, use them within 24 hours. Do not put them back in the freezer.
Bring the room to the correct temperature. Remove from the refrigerator 20 to 30 minutes before whipping. Do not keep at room temperature for longer than necessary and always use within 2 hours of removing from the refrigerator.
Recipes Using Egg Whites
- French Macaron: Aging the egg whites is the key technique that gives macarons their characteristic legs and stable shells
- Keto Raspberry Lemon Waffles: Adding properly beaten cold egg whites to the batter makes a very light waffle.
- Unsweetened Sugar Cookies: A simple egg white glaze gives these cookies a crisp, clean finish
- Pre-Workout Smoothie: Pasteurized carton egg whites blend seamlessly into smoothies for a clean protein boost
Frequently Asked Questions
I accidentally left the egg whites out overnight. Are they still safe?
No, egg whites left at room temperature overnight have gone several hours beyond the FDA’s 2-hour safe window. Discard them. Even though they may look and smell normal, the growth of bacteria at room temperature in the protein-rich liquid egg whites is real and cannot be reversed by subsequent refrigerating or cooking. Some bacterial toxins are heat-stable and survive cooking temperatures. This applies to both fresh-separated white and carton liquid white.
Can I use egg whites straight from the fridge to whip?
You can, but they will whip better when heated a little. Cold egg whites take longer to whip and have a slightly lower volume because any residual yolk contamination causes the fat molecules to be more active at colder temperatures and can prevent foaming. For best results, remove the egg whites from the refrigerator 20 to 30 minutes before whipping them. Make sure your bowl and whisk are completely clean and free of any grease, which will also prevent the whites from whisking properly.
How do I know how many egg whites are in my container?
One large egg white equals about 2 tablespoons or 30 ml. If you pour leftover egg whites into a container without counting, measure by tablespoons: every 2 tablespoons equals one large egg white. Label the container with the count so you know how many you have for the next recipe without having to open and measure again. Most recipes specify egg whites by count, so keeping track of this from the beginning can avoid the guesswork of changing amounts later.
Further reading
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