Knowing the pack date can help you put a carton’s other dates into perspective.
A carton may have a sell-by, use-by, best-before, or similar date printed on it. These labels generally relate to quality or inventory management rather than acting as a universal food-safety cutoff. USDA guidance explains that food dating is primarily intended to communicate quality, while proper storage and handling remain critical to safety.
What Does the “Sell-By” Date Mean?
A sell-by date is primarily intended to help retailers manage inventory. It tells the store how long the product should remain available for sale under the applicable labeling rules.
It does not automatically mean the eggs become unsafe at midnight on that date.
USDA guidance notes that properly refrigerated eggs can remain usable beyond the sell-by date, although quality can gradually decline. USDA recommends purchasing eggs before the sell-by or expiration date and then refrigerating them promptly.
That distinction is important because throwing away perfectly good eggs solely because a printed date has passed can contribute unnecessarily to food waste.
What About “Use By” or “Best Before”?
The wording on egg cartons can vary depending on the product and applicable state requirements.
In general, terms such as “Best By,” “Best Before,” or “Best if Used By” are associated with quality. They indicate when the product is expected to be at its best rather than establishing a universal safety deadline.
A date labeled “Use By” should still be taken seriously as a quality guideline, but it shouldn’t be viewed in isolation. Refrigeration, handling, shell condition, and signs of spoilage all matter.
What Does the “P” Number Mean?
Another code you may notice is something such as P-1234.
The P generally identifies the egg-processing facility or plant. For USDA-graded eggs, the plant number appears on the consumer package and can help identify where the eggs were processed or packed.
This type of identification is especially useful when authorities or producers need to trace products during a food-safety investigation or recall.
So, if you see a plant code next to a three-digit number, don’t assume that every number is an expiration date. Different markings serve different purposes.
Egg Carton Codes Can Be Helpful During Recalls
Those seemingly mysterious numbers aren’t just there for shoppers trying to determine freshness.
Packaging codes provide important traceability information. If a particular production lot is identified as part of a food-safety recall, codes on cartons can help consumers determine whether their eggs are included.
That’s one reason it’s wise not to discard the carton immediately after bringing eggs home. Keeping eggs in their original carton preserves the identifying information and also makes it easier to follow storage guidance.
Freshness and Safety Are Not Exactly the Same Thing
This is perhaps the most important point to remember.
An egg can gradually lose quality as it ages. Its texture and performance in cooking may change, even when it has been properly refrigerated. But food safety depends on more than age alone.
Fresh eggs can contain Salmonella, even when their shells look clean and uncracked. The FDA therefore recommends careful refrigeration, proper handling, and thorough cooking.
In other words:
A carton date is a useful piece of information, but it isn’t a substitute for safe food handling.
How to Store Eggs Properly
Once you understand the carton codes, the next step is making sure your eggs are stored correctly.
Keep Eggs Refrigerated
The FDA recommends storing eggs at 40°F (4°C) or below. After purchasing them, refrigerate them promptly rather than leaving them at room temperature for an extended period.
Keep Them in the Original Carton
The carton protects the eggs and keeps their identifying information available.
It also helps prevent odors from other foods from affecting the eggs.
Avoid the Refrigerator Door
Although many refrigerators have egg-shaped compartments in the door, the temperature there can fluctuate more frequently than in the main refrigerator compartment.
USDA recommends keeping eggs in the coldest part of the refrigerator rather than the door.
Don’t Wash Eggs at Home
If you’re using commercially processed eggs, washing them again at home isn’t recommended. USDA explains that home washing can increase contamination risk by allowing water to move through the shell’s pores.
How Long Do Eggs Usually Keep?
Under proper refrigeration, USDA says shell eggs can generally be kept in the refrigerator for three to five weeks from the day they are placed in the refrigerator.
For best quality, the FDA recommends using refrigerated eggs within about three weeks.
These recommendations assume that the eggs have been properly refrigerated and handled. If eggs have been exposed to unsafe temperatures or poor handling, the carton date cannot make them safe again.
What If the Carton Date Has Passed?
Don’t automatically assume that the eggs must be thrown away simply because the printed date has passed.
Instead, consider:
- Were the eggs kept continuously refrigerated?
- Is the carton intact and identifiable?
- Are the shells cracked or damaged?
- Do the eggs show obvious signs of spoilage after cracking?
- Have the eggs been handled safely?
USDA explains that food dates generally communicate quality rather than automatically marking the point at which food becomes unsafe. However, food that has been improperly stored or shows signs of spoilage should not be eaten.
When in doubt about an egg that has been mishandled or exposed to unsafe temperatures, the safest choice is to discard it.
Safe Cooking Matters Too
Even eggs that are fresh and properly refrigerated can potentially carry Salmonella.
The FDA recommends cooking eggs until the yolk and white are firm and cooking foods containing eggs thoroughly.
For dishes containing eggs, using a food thermometer can provide an extra measure of confidence. The FDA recommends cooking egg-containing casseroles and similar dishes to 160°F (71°C).
If a recipe calls for eggs that remain raw or undercooked, such as certain homemade desserts or sauces, consider using pasteurized eggs or pasteurized egg products when appropriate.
A Quick Cheat Sheet for Egg Carton Codes
| Marking | What It Generally Tells You |
|---|---|
| 3-digit number | Pack date expressed as the day of the year |
| Sell By | Retail inventory/stock-rotation date |
| Best By / Best Before | Expected quality period |
| Use By | Recommended quality-use date |
| P-#### | Egg-processing plant identification number |
The exact labeling requirements can vary by jurisdiction, so treat this as a practical guide rather than assuming every carton will use identical markings.
The Bottom Line
Egg carton codes may look mysterious, but they’re really there to provide useful information about when eggs were packed, where they came from, and how their quality dates should be interpreted.
The most useful habit is to look at the entire picture rather than relying on one number. Keep eggs refrigerated at 40°F (4°C) or below, store them in their original carton, handle them carefully, and cook them thoroughly.
Once you know what the three-digit pack date, sell-by date, and plant code mean, reading an egg carton becomes much less confusing—and you can make more informed decisions about freshness, quality, and food safety.
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