How to Tell If An Egg Has Gone Bad

Eggs are one of the most versatile foods out there. From scrambled breakfasts to rich cakes and desserts, they’re a staple in almost every kitchen. But here’s the thing—eggs don’t last forever. Even though they have a protective shell, they can still spoil. Knowing how to tell if an egg is fresh not only keeps your meals delicious but also protects you from foodborne illness. Let’s go over some of the easiest and most reliable ways to check.

Checking the Date on the Carton

When you pick up a carton of eggs, take a look at the printed date. This isn’t always an expiration date—it’s often a “packing date,” written in Julian format (a number between 001–365 that shows the day of the year the eggs were packed). Generally, eggs stay fresh for 4–5 weeks after this date if stored properly in the fridge. Still, for the best flavor and safety, try to use them within three weeks of purchase.

The Easy Float Test

One of the simplest tricks is the float test. As eggs age, the air pocket inside grows larger, which affects how they sit in water. Here’s how it works:

  • If the egg sinks and lies flat on its side, it’s very fresh.
  • If it sinks but stands upright, it’s older but still usable.
  • If it floats to the top, it’s gone bad and should be tossed.

When in doubt, it’s always better to be safe than sorry. If you’re unsure how long your eggs have been sitting in the fridge, the float test can give you a quick answer.

Using Your Senses to Check

Your nose, eyes, and even ears can help you spot a bad egg. Fresh eggs don’t have much of a smell, maybe just a light grassy scent. But if you catch even a hint of sulfur or rot, it’s spoiled. A quick sniff before cracking is always smart.

Shake the egg gently—fresh eggs won’t make noise, but if you hear sloshing, it means the inside has thinned out and is no longer fresh. Also, inspect the shell carefully. Discard any eggs with cracks, odd discoloration, or residue on the outside. While these methods aren’t as precise as the float test, they add extra reassurance.

How Eggs Are Produced Matters

The way eggs are produced can also influence their freshness and quality. Free-range hens, for example, often lay better-tasting, higher-quality eggs. A hen that lives with less stress typically produces eggs with stronger shells and fresher interiors. Many experts believe that animal welfare directly affects egg quality—something worth considering when you shop.

Enjoy Fresh Eggs With Confidence

Making sure your eggs are fresh is key to safe and delicious meals. By checking the carton date, doing the float test, and using your senses, you’ll always know whether an egg is safe to use. And by understanding how eggs are produced, you can make smarter choices at the store. With these tips, you’ll enjoy fresh eggs without the worry of spoiled ones sneaking into your recipes.