Should You Wash Fresh Eggs? The Bloom, Explained

What the bloom is

As a hen lays, she coats the shell in a thin moist layer that dries within minutes. That's the bloom, or cuticle. A shell has thousands of tiny pores, and the bloom caps them, slowing moisture loss from inside and blocking bacteria from outside. It's the reason an egg can sit in a nest for days in the open air and stay good.

Washing removes it. Warm water and a scrub take the cuticle off entirely, and after that the shell is porous. That isn't a disaster, it just changes the rules the egg lives by from that point on.

The two systems, and why mixing them is the mistake

This is where most of the internet argument comes from, because two large parts of the world do the opposite thing and both have good reason.

The washed and chilled system

In the United States, commercial eggs are washed and sanitised before sale. That strips the cuticle, so refrigeration is required to compensate and is maintained from packing plant to shop shelf. It works, and it's why supermarket eggs sit in a chiller.

The unwashed and unrefrigerated system

EU rules don't permit washing Class A table eggs, on the grounds that an intact cuticle is better protection than a clean-looking shell, and that sits alongside national Salmonella control programmes, with vaccination mandatory in some countries rather than EU-wide. Eggs sit on an unrefrigerated aisle and keep well.

Neither is wrong. What doesn't work is taking half of each: washing an egg and then leaving it on the counter strips the protection and gives nothing back. Pick a lane. For a backyard flock, unwashed is usually the easier lane, because it keeps both options open.

How long fresh eggs keep

• Unwashed, cool room temperature: about two weeks, and the cooler the room the better. This is the traditional larder approach and works well if you eat eggs steadily.
• Unwashed, refrigerated: two to three months is the figure extension guidance gives. Cold plus an intact cuticle is the longest-keeping combination available to you.
• Washed, refrigerated: shorter than unwashed and refrigerated, but still measured in weeks rather than days. Wash right before use and this never comes up.
• Washed, room temperature: the one to avoid. You have removed the defense and provided no substitute.

If you refrigerate, do it at 40F or below, which is the figure the storage advice assumes. And one caveat on the counter option: the unwashed, unrefrigerated system works in Europe on the back of regulated, monitored commercial flocks, and a US backyard flock sits outside both systems. US public-health guidance for backyard keepers is to refrigerate, and that's the sturdier default here, especially for young children, pregnant people, adults over 65 and anyone immunocompromised. These are quality ranges rather than safety deadlines. The USDA guidance on refrigerated egg storage is the reference point for the washed-and-chilled system, and it's worth reading if you're storing eggs for anyone beyond your own household.

The float test, and what it doesn't tell you

An old egg loses moisture through the shell and its internal air cell grows, so it floats. That makes the float test a decent age sorter and a poor safety test, because bacteria don't change buoyancy. A sinking egg can still be contaminated and a floating one is often merely stale.

Use it to triage a basket you have lost track of, then crack each questionable egg into a separate bowl before it joins anything else. Smell settles spoilage faster than any test, and a rotten egg isn't subtle. What smell can't tell you is the thing worth being clear about: a fresh, clean, uncracked egg can still carry Salmonella, with nothing off about how it looks or smells. Neither floating nor sniffing screens for that. Cooking does, so cook eggs until the yolk and white are both firm, and take egg-based dishes to 160F.

Cleaning a dirty egg without wrecking it

Most eggs need nothing. For a smear of mud or a bit of droppings, dry-clean: a dry brush, a loofah, or fine sandpaper takes it off and leaves the cuticle in place. Keep those eggs in the normal rotation.

For an egg that's properly soiled, wash it and accept the consequence, which is that it goes in the fridge and gets used sooner. Use running water that's both at least 90F and at least 20 degrees warmer than the egg, which is the commercial standard. Water cooler than the egg makes the contents contract and can draw surface bacteria in through the pores, and a difference of a few degrees isn't enough to rely on. Dry it and refrigerate.

The real fix is upstream. Clean, well-bedded, private nest boxes mean far fewer dirty eggs, and a bird laying on the coop floor produces most of the problem ones. Our nest box guide covers setup, and coop cleaning covers keeping the bedding under them dry.

Storing them so you know what's what

Whichever system you pick, the practical problem is rotation, because eggs arrive daily and all look alike. A spiral rack that loads at one end and dispenses from the other solves it mechanically, and a dated carton solves it for anything going in the fridge. Point the eggs blunt end up, which keeps the air cell at the top and the yolk centered.

Where we're less certain than the internet is

Shelf-life figures vary between sources, and we aren't going to invent precision that the evidence doesn't carry. The ranges here are the ones that recur across extension and government guidance, but your kitchen temperature, how clean the eggs were, and how fast the flock lays all shift them. When an egg is questionable, the answer is your nose and a separate bowl rather than a number from an article.

Common questions

Do fresh eggs need to be refrigerated?

Only if they have been washed, or if you want the long storage life. An unwashed egg with its bloom intact keeps on the counter for a couple of weeks in a cool kitchen, which is how much of Europe sells eggs, though US guidance for backyard flocks is to refrigerate. A washed egg has lost that protection and belongs in the fridge. And once any egg has been refrigerated, keep it there.

How long do fresh eggs last?

Roughly two weeks unwashed at cool room temperature, and two to three months unwashed in the fridge at 40F or below. Washed eggs in the fridge sit somewhere in between. Those are quality ranges rather than hard expiry dates, and an egg that smells wrong when you crack it goes in the bin whatever the calendar says.

Does the float test tell me if an egg is safe?

No, and this is the most misunderstood thing on the subject. Floating tells you an egg has lost moisture and gained air, so it's old. It says nothing about bacteria: a fresh-sinking egg can be contaminated and an old floater can be fine. Use it to sort by age, then crack into a bowl and use your nose.

Why are supermarket eggs refrigerated but farm eggs aren't?

Because the US washes eggs commercially, which strips the cuticle, so refrigeration becomes mandatory to compensate. Many European countries don't wash and don't refrigerate, and rely on the intact cuticle plus national Salmonella control programmes, which include mandatory vaccination in some countries rather than all. Both systems are coherent on their own terms; the mistake is running half of one and half of the other.

How do I clean a dirty egg without washing it?

Dry-clean it. A dry brush, a bit of fine sandpaper or a loofah takes off a smear while leaving the cuticle. Save actual washing for eggs that are properly soiled, and use water at least 90F and at least 20 degrees warmer than the egg, so the contents expand outward rather than drawing surface bacteria in through the pores.

Where this leaves you

Collect often, dry-clean what needs it, leave the bloom alone, and decide once whether your eggs live on the counter or in the fridge. That single decision handles almost every follow-up question. If you're still waiting on the first one, our guide to when hens start laying covers the timeline, and why hens stop laying covers the gaps once they're going.