You’ve probably heard about the famous “float test.”
The idea is simple: fill a bowl with cold water and gently place an egg inside.
- Fresh eggs usually sink and lie flat on the bottom.
- Older eggs may stand upright because they’ve developed a larger air pocket.
- Very old eggs often float to the surface.
So, does this mean a floating egg is automatically unsafe to eat?
Not exactly.
The float test only tells you how much air has entered the egg over time. As eggs age, moisture and carbon dioxide slowly escape through the shell, allowing air to replace them. This makes the egg more buoyant.
A floating egg is likely old, but age and safety aren’t always the same thing. An egg can sink and still contain harmful bacteria if it has been improperly stored. Likewise, a floating egg isn’t necessarily contaminated, although it’s usually best to avoid eating it if you’re unsure how it has been handled.
In other words, the float test is useful for estimating freshness—not for determining whether an egg is free of bacteria.
What About Farm-Fresh Eggs?
This is where things become a little confusing.
If you’ve ever visited a farm or bought eggs directly from a local farmer, you may have noticed that the eggs weren’t refrigerated at all.
That’s because, in many countries, freshly laid eggs still have their natural protective coating, called the cuticle or bloom, intact. This invisible layer helps seal the shell’s tiny pores and makes it more difficult for bacteria to enter.
As long as that protective coating remains untouched, unwashed eggs can often be stored safely at room temperature for a period of time, depending on local food safety practices.
However, once eggs have been washed—as they typically are in the United States—they should remain refrigerated continuously.
The most important rule is consistency.
If eggs have been refrigerated, keep them refrigerated.
Repeatedly moving eggs between cold and warm temperatures creates condensation on the shell, which can increase the chance of bacteria entering the egg.
Should You Refrigerate Hard-Boiled Eggs?
Yes.
Hard-boiled eggs should also be refrigerated after cooking.
According to food safety recommendations, cooked eggs should not sit at room temperature for more than two hours, or one hour if the surrounding temperature is above 90°F (32°C).
Hard-boiled eggs generally stay fresh for about one week when stored in the refrigerator in their shells.
If you’ve peeled them, it’s best to keep them in a covered container and eat them within a few days for the best quality.
What About Eggs Used in Baking?
Many recipes call for eggs to sit at room temperature before mixing.
This is completely normal.
Room-temperature eggs blend more easily into cake batter, cookie dough, cheesecakes, and other baked goods. They can also help create smoother batters and better volume in certain recipes.
Fortunately, bringing refrigerated eggs to room temperature doesn’t take very long.
Most recipes only require leaving them out for about 20 to 30 minutes before use.
That amount of time is well within food safety guidelines.
If you’re in a hurry, you can place the eggs in a bowl of warm—not hot—water for about 10 to 15 minutes instead of leaving them on the counter.
Common Egg Storage Mistakes
Many people accidentally shorten the shelf life of their eggs without realizing it.
Some of the most common mistakes include:
- Leaving eggs in a hot car after grocery shopping.
- Storing eggs in the refrigerator door, where temperatures fluctuate every time it’s opened.
- Returning eggs to the refrigerator after they’ve been left out for several hours.
- Washing eggs before storing them, which can remove their natural protective coating if they haven’t already been washed.
- Using cracked eggs without checking whether bacteria may have entered through the damaged shell.
A little extra attention during storage goes a long way toward keeping eggs safe.
How to Store Eggs Properly
To maximize both freshness and safety, follow these simple tips:
- Keep eggs refrigerated at 40°F (4°C) or below.
- Store them in their original carton rather than transferring them to another container.
- Place the carton on a middle shelf inside the refrigerator instead of the door.
- Avoid exposing eggs to repeated temperature changes.
- Use older eggs before newer ones.
- Check the expiration or “best by” date regularly.
The original carton also helps protect eggs from absorbing odors from strong-smelling foods like onions, garlic, or fish.
Can You Freeze Eggs?
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