Spoiled hard-boiled eggs often have a foul, sulfuric smell, a slimy or chalky texture, and visible discoloration, like a greenish or gray ring around a yellow yolk or pinkish spots, indicating bacterial growth; if you see or smell these, discard them immediately, as they can be unsafe to eat.
Nausea, vomiting, diarrhea, and dehydration are common concerns after eating spoiled eggs. Eating spoiled eggs can cause food poisoning with symptoms like stomach cramps, nausea, vomiting, and diarrhea. Most cases improve with rest and hydration at home. Drink plenty of fluids to prevent dehydration.
Hard cooked eggs can be stored in the refrigerator up to seven days, either left in their shells or peeled. Make sure eggs are refrigerated within two hours after cooking, and don't leave refrigerated cooked eggs out at room temperature for more than two hours.
Store eggs in their original carton and use them within 3 weeks for best quality. Use or eat hard-cooked eggs (in the shell or peeled) within 1 week after cooking. Use frozen eggs within 1 year. Eggs should not be frozen in their shells.
Salmonella illness can be serious and is more dangerous for some groups of people. Most people who get sick from Salmonella have diarrhea, fever, vomiting, and stomach cramps. Symptoms usually begin 6 hours to 6 days after infection and last 4 to 7 days. Most people recover without antibiotic treatment.
As a rule of thumb, hard-boiled eggs can be preserved up to 7 days in the refrigerator. "If you follow the proper precautions, they should stay fresh for up to 7 days in the fridge."
Kansas State University food scientist Karen Blakeslee said cooking eggs properly is key to preventing foodborne illness. “Undercooked hard boiled eggs can leave the yolk and possibly the white runny and any possible Salmonella bacteria can survive. This could lead to foodborne illness,” Blakeslee said.
No, the egg float test isn't completely accurate for determining if an egg is truly bad (rotten), though it generally indicates freshness or age; a floating egg is usually old and should be tossed, while a sinking one is likely fresh, but a fresh egg can sometimes float, and an old one can still sink, so the sniff test after cracking remains the most reliable way to check for spoilage.
If you do test an egg by placing it in water, you can still crack it open to see if it's a bad egg. When you crack it open, look for other signs of discoloration or a sour smell. A fresh egg doesn't have a smell, but an egg that is going bad smells like sulfur.
The "555 egg method" is a popular technique for making easy-peel hard-boiled eggs in an Instant Pot or other pressure cooker, involving 5 minutes of high pressure, a 5-minute natural pressure release, and a final 5-minute ice bath to stop cooking and loosen the shell, though results can vary, with some finding it perfect and others needing adjustments.
Food Safety: Eating Eggs Past Expiration Date
Inspect for cracks or off smells before boiling. Even if past expiration, eggs that pass these tests are generally safe to cook thoroughly. Always boil eggs until both yolk and white are firm to reduce bacterial risks.
To tell if an egg is bad, use the float test: fresh eggs sink, older ones stand on end, and rotten ones float, but the most reliable method is the smell and visual test after cracking it in a separate bowl—a sulfurous odor, discoloration (pink, green, iridescent), or a very flat, runny consistency means it's bad, even if it passes the float test.
After boiling your eggs, ensure that you label and date them. If they are older than the date you mark them, they are likely spoiled and should be thrown away. If the yolk is watery or gray, the egg is likely rotten.
In most people, listeriosis has no symptoms or only causes mild symptoms for a few days, such as:
Contact your doctor immediately if you develop the following symptoms:
In 2020, eggs and egg products are the most common foods linked to Salmonella, accounting for 5.3% of all the foodborne Salmonella outbreaks [6].
Processing eggs in Europe
One, various countries in Europe vaccinate chickens against salmonella beforehand. In addition, eggs are not washed like they are in the United States, so the cuticle is left on the shell. As a result, eggs can be stored at room temperature instead of needing to be refrigerated.
The general consensus on food safety from the USDA is that raw eggs in the shell will last for three to five weeks when properly refrigerated.
How Long Can Hard-Boiled Eggs Sit Out? Unrefrigerated hard-boiled eggs can sit out for no more than two hours (or one hour if the temperature outside is 90 degrees Fahrenheit or above), per the USDA. Hard-boiled eggs (peeled or unpeeled) are safe to eat for a week in the fridge.