How to Tell If Eggs Are Bad
Eggs are a kitchen staple, but freshness is not always obvious from the carton date alone.
Knowing how to tell if eggs are bad helps you avoid foodborne illness, reduce waste, and use eggs with confidence.
The tricky part is that some spoiled eggs look normal at first glance.
A few simple checks can reveal whether an egg is safe to use or should be thrown away.
Start With the Date on the Carton
Carton dates are a helpful starting point, but they are not the only factor.
In the United States, egg cartons may show a pack date, sell-by date, or expiration date, depending on the brand and retailer.
- Pack date: Often shown as a three-digit Julian date, representing the day of the year the eggs were packed.
- Sell-by date: A store inventory guide, not a strict safety cutoff.
- Expiration or use-by date: More relevant to freshness, but still not a substitute for storage and inspection.
Eggs stored properly in the refrigerator can remain usable beyond the date on the carton, but the date should still prompt a closer check if you are unsure.
Check the Shell for Visible Warning Signs
Before cracking an egg, inspect the shell carefully.
A clean, intact shell usually suggests the egg is still in good shape, while obvious damage can mean contamination or age-related deterioration.
What to look for on the shell
- Cracks: Even tiny cracks can allow bacteria to enter.
- Leaks or stickiness: Moisture, residue, or a slimy feel may indicate spoilage.
- Powdery or fuzzy spots: Mold growth is a clear sign to discard the egg.
- Unusual discoloration: Heavy staining or odd spotting may warrant caution.
If the shell is broken and the egg has been unrefrigerated for more than two hours, discard it.
In hot environments above 90°F, that window drops to one hour.
Use the Smell Test After Cracking the Egg
The most reliable everyday indicator of a bad egg is odor.
A spoiled egg often gives off a strong sulfur-like, rotten, or unpleasant smell as soon as it is cracked open.
Smell the egg immediately after cracking it into a separate bowl.
If it smells off in any way, do not taste it.
Odor is one of the clearest signs that the egg should be thrown out, even if it looks normal.
It is also possible for the shell to smell strange while the egg itself is still usable, especially if it picked up odors from strong foods in the refrigerator.
That is why cracking the egg into a clean bowl is a better test than smelling only the shell.
Look at the Egg White and Yolk
Fresh eggs have distinct visual characteristics, though appearance alone does not prove spoilage.
A fresher egg typically has a firm, rounded yolk and a thick white that stays close to the yolk.
As an egg ages, the white becomes thinner and spreads more.
Signs the egg may be bad
- Pink, green, or iridescent whites: Can indicate bacterial growth.
- Cloudy white with a strong odor: Not safe to use.
- Unusual texture: Slimy, watery, or stringy albumen may be a warning sign.
- Broken yolk with off smell: Discard immediately.
Some changes are not spoilage.
For example, a cloudy egg white can be a sign of freshness, because dissolved carbon dioxide makes the white look hazier.
Smell and sanitation matter more than cloudiness alone.
Try the Float Test Carefully
The float test is a common home method for estimating egg age.
Fill a bowl with cold water and gently place the egg inside.
- Sinks and lays flat: Very fresh.
- Sinks but stands upright: Older, but may still be usable if it passes the smell and shell checks.
- Floats: Usually too old and should be discarded.
This happens because air enters the egg through its porous shell over time, enlarging the air cell inside.
A floating egg is not always proof of spoilage, but it is a strong sign the egg has aged enough that it is safer to throw away.
Do not rely on the float test alone.
An egg that sinks can still be bad if it has been contaminated, stored incorrectly, or cracked.
Know the Risks of Eating Bad Eggs
Spoiled or contaminated eggs can cause foodborne illness, including salmonella infection.
Symptoms may include diarrhea, stomach cramps, fever, nausea, and vomiting.
Young children, pregnant people, older adults, and anyone with a weakened immune system are at higher risk for complications.
Cooking eggs thoroughly reduces risk, but it does not make a clearly spoiled egg safe.
If an egg is rotten, cracked and mishandled, or obviously contaminated, it should not be used in any recipe.
Store Eggs Properly to Make Them Last Longer
Proper storage is one of the best ways to keep eggs fresh.
Refrigeration slows bacterial growth and preserves quality.
- Keep eggs refrigerated at 40°F or below.
- Store them in the original carton. The carton helps prevent moisture loss and odor absorption.
- Place them on an interior refrigerator shelf. Avoid the door, where temperature fluctuates most.
- Do not wash eggs before storing. Washing can remove the protective coating on the shell.
- Use older eggs first. Rotate stock so nothing gets forgotten in the back of the fridge.
If you are unsure how long eggs have been in your refrigerator, mark the carton with the purchase date to make tracking easier.
When Should You Throw Eggs Away?
Discard eggs if any of the following apply:
- The shell is cracked, leaking, or moldy.
- The egg smells bad after cracking.
- The contents look pink, green, or otherwise unusual.
- The egg floats in water and also seems old or questionable.
- The egg has been stored unrefrigerated too long.
- You cannot confirm how it was handled and it seems suspicious.
When in doubt, throw it out.
The cost of replacing a few eggs is far lower than the risk of eating a contaminated one.
Can You Tell If Eggs Are Bad Without Cracking Them?
Yes, but only to a point.
Shell inspection, carton dates, and the float test can all help identify problems before cracking.
However, the most reliable sign of spoilage often appears after the egg is opened, when odor and texture become easier to assess.
For recipes that require raw or lightly cooked eggs, such as Caesar dressing, homemade mayonnaise, or soft-set custards, use only fresh eggs from a trustworthy source and store them correctly from the start.
Common Misunderstandings About Egg Freshness
- “Eggs are bad if the whites are cloudy.” Not necessarily; cloudiness can mean freshness.
- “A floating egg is always rotten.” Floating usually means old, but not every old egg is rotten.
- “If it looks fine, it is safe.” Appearance alone does not rule out spoilage.
- “The sell-by date is a safety deadline.” It is mainly a store-management date.
Understanding these differences helps you make better judgments and prevents unnecessary waste.
Practical Rule for Deciding Fast
If you need a quick decision, use this sequence: check the carton date, inspect the shell, crack the egg into a separate bowl, and smell it immediately.
If anything seems off, discard it.
That simple process covers the most important signs of spoilage and is usually enough to tell whether an egg is usable or unsafe.
