How to Tell If an Egg Is Fresh (and What "Fresh" Even Means)

How to Tell If an Egg Is Fresh (and What "Fresh" Even Means)

Eggs don't have expiration dates that mean what you think they mean. A "best before" date on a carton is about quality, not safety — and eggs routinely stay good for weeks past it. Here's how to actually judge an egg, what the dates mean, and when to throw one out.

The Water Test: Sink or Float

Put the egg in a glass of water:

• Lays flat on the bottom: very fresh.
• Stands upright on the bottom: a few weeks old, still perfectly fine to eat.
• Floats: old — the air cell has grown large as moisture and CO2 escaped through the shell. Crack it into a bowl first; if it smells fine and looks normal, it's still safe for most uses, but don't risk it for anything where eggs are the star.

Why it works: every egg has an air cell at the blunt end. As the egg ages, water evaporates through the porous shell and the air cell grows, making the egg more buoyant.

What "Fresh" Really Means (and Doesn't)

Supermarket eggs are typically 2-6 weeks old by the time you buy them, and that's completely normal. "Fresh" for a cook mostly means: the white is thick and stands tall, the yolk is domed, and the egg holds together when cracked. As eggs age, the white thins and spreads — that's why fresh eggs make better poached eggs and older eggs are easier to peel after hard-boiling (the thinner white doesn't bond as tightly to the shell).

The Crack Test

When in doubt, crack the egg into a small bowl:

• Smell: a bad egg smells sulfuric and unmistakable. Trust your nose — it's the single most reliable test.
• Look: the white should be clear or slightly cloudy (cloudy = very fresh). A greenish tint to the white is old but harmless. Pinkish or iridescent sheen means bacterial growth — discard.
• Texture: a watery, runny white and a flat yolk mean the egg is old but usually fine for baking or scrambling.

Date Labels, Decoded

LabelMeaning Pack date (Julian: 001-365)Day the eggs were washed, graded, and packed. This is the real "birth" marker. Sell byLast day the store should sell them — usually about 30 days after pack. Best by / Use byQuality deadline, roughly 4-5 weeks after pack. Eggs are safe well beyond it if refrigerated.

Rule of thumb: refrigerated eggs are safe to eat 4-5 weeks after the pack date, and often longer. If the date has passed but the egg passes the water and crack tests, it's fine.

Storage Rules That Actually Matter

• Keep eggs in the fridge, in their carton, not in the door (the door warms up every time it opens).
• Store them pointed end down — it keeps the yolk centered.
• Don't wash them; the protective coating (bloom) keeps bacteria out. Only wash right before cooking, if at all.
• Hard-boiled eggs last about a week in the fridge; raw eggs in the shell last 4-5 weeks past pack date.

When to Throw an Egg Out

Floats in water and smells bad cracked open, or shows a pink/iridescent white. That's the whole list. Everything else is a quality question, not a safety one.