Do You Have to Keep Eggs in the Refrigerator?

U.S. grocery store eggs must be refrigerated because they're washed at the processing plant, which removes their natural protective coating and makes them vulnerable to bacterial growth

The short answer: no, you don't have to refrigerate eggs immediately, but you should if you want them to last. In the United States, eggs are washed and sanitized at the processing plant, which removes the protective coating on the shell. This makes them more porous and vulnerable to bacteria like Salmonella entering through the shell. Refrigeration slows bacterial growth and keeps eggs fresh for 3 to 5 weeks. At room temperature, that window shrinks to 7 to 10 days.

In many European countries, eggs are not washed and retain their natural protective layer, so room-temperature storage is standard and safe. But if you're buying U.S. eggs from a grocery store, they've already been treated in a way that assumes refrigeration will follow. Once you bring them home, the safest choice is to refrigerate them.

Key Takeaways

• U.S. grocery store eggs are washed at the plant, making them more porous and requiring refrigeration to prevent bacterial growth.
• Refrigerated eggs stay fresh for 3 to 5 weeks; unrefrigerated eggs are safe for about 7 to 10 days.
• Store eggs in their original carton on a shelf (not the door), where temperature stays most consistent.
• A floating egg in water does not mean it's bad—age and air cell size determine buoyancy, not safety.
• Cooked eggs last 3 to 4 days in the refrigerator and should be stored in an airtight container.

Why U.S. Eggs Need Refrigeration

The reason comes down to how eggs are processed. U.S. regulations require eggs to be washed within a few hours of laying to remove dirt and bacteria from the outside of the shell. This washing removes the cuticle—a natural waxy coating that seals the shell and prevents bacteria from entering. Once that layer is gone, the shell becomes porous, and bacteria can migrate inward, especially if the egg sits at warm temperatures where bacterial growth accelerates.

Refrigeration doesn't kill bacteria that may already be inside the egg; it slows their reproduction. At 45°F (7°C) or below, bacterial growth nearly stops. At room temperature (around 70°F or 21°C), bacteria multiply much faster. This is why the USDA recommends refrigerating U.S. eggs as soon as you get home from the store.

If you buy eggs from a local farm that hasn't washed them, the cuticle is still intact, and room-temperature storage is genuinely safer. But you need to know the source. Store-bought eggs are always washed, so refrigerate them.

How Long Eggs Last in the Refrigerator vs. on the Counter

Refrigerated eggs in their original carton stay fresh for 3 to 5 weeks from the date you bring them home. The carton itself matters—it protects eggs from absorbing odors and flavors from other foods, and it slows moisture loss. Eggs stored loose on a shelf or in the door lose freshness faster.

Unrefrigerated eggs are safe to eat for about 7 to 10 days if kept at a consistent room temperature below 68°F (20°C). Once the temperature climbs above 75°F (24°C), that window shrinks to 3 to 4 days. If your kitchen gets warm in summer or you live in a hot climate, room-temperature storage becomes risky very quickly.

The date printed on the carton is the pack date (when the eggs were graded and packed), not an expiration date. You can safely use eggs well past that date if they've been refrigerated. A practical rule: if an egg has been refrigerated, you can use it for at least 4 weeks from purchase.

The Right Way to Store Eggs in Your Refrigerator

Keep eggs in their original carton on a shelf, not in the door. The door is the warmest part of the refrigerator because it's opened frequently and exposed to room-temperature air. Eggs need consistent cold, and a shelf (usually the middle or lower shelves) maintains a steadier temperature.

The carton also protects eggs from absorbing strong odors—onions, garlic, and fish can transfer their smell through the porous shell. Storing eggs loose or in a decorative bowl on the shelf exposes them to these odors and causes them to dry out faster.

Keep eggs away from raw meat and poultry. If raw meat drips, it shouldn't land on eggs. Store eggs on a shelf above raw proteins, or in a separate drawer if your refrigerator has one.

How to Tell If an Egg Is Still Good

The float test is the most reliable check. Fill a bowl with cold water and gently place the egg in it. A fresh egg sinks and lies flat on the bottom. An older egg stands upright or floats because the air cell inside has grown larger as the egg ages and loses moisture. A floating egg is still safe to eat—age alone doesn't make an egg unsafe. But if the egg floats and smells sulfurous or off when you crack it, discard it.

Smell is the best safety indicator. A fresh egg has little to no odor. A spoiled egg smells distinctly sulfurous or rotten. If you crack an egg and the yolk or white looks discolored, cloudy, or has an unusual texture, don't use it.

Visible cracks in the shell are a reason to discard the egg. A cracked shell allows bacteria to enter directly, and you can't see what's inside. Even if the egg looks fine, a crack is a safety risk.

Storing Cooked Eggs and Egg Dishes

Cooked eggs (boiled, fried, scrambled) last 3 to 4 days in the refrigerator if stored in an airtight container. Store them on a shelf, not the door. Label the container with the date so you know when you cooked them.

Egg dishes like quiches, frittatas, and casseroles also last 3 to 4 days. Custard-based dishes (like flan or crème brûlée) should be eaten within 2 days because they have a higher moisture content and spoil faster. Always cover these dishes tightly to prevent them from drying out and absorbing refrigerator odors.

Mayonnaise and other egg-based condiments have different rules because they contain acid (vinegar or lemon juice) and oil, which preserve them. Store-bought mayo lasts months in the refrigerator. Homemade mayo, made with raw eggs, should be used within a few days and kept in an airtight container.

What to Do If Eggs Have Been Left Out

If eggs sat on the counter at room temperature for less than 2 hours, they're safe to refrigerate and use normally. If they've been out for more than 2 hours (or more than 1 hour if the room was above 90°F or 32°C), discard them. Bacteria multiply rapidly in that window, and you can't see or smell the contamination.

If you've already cooked eggs that were left out too long, the same rule applies: if they sat unrefrigerated for more than 2 hours after cooking, throw them away. Cooked eggs are more vulnerable to bacterial growth than raw eggs because the cooking process can distribute any bacteria that was present throughout the egg.

Frequently Asked Questions

Can I refrigerate eggs after I've left them on the counter?

Yes, if they've been out for less than 2 hours. Once you refrigerate them, they're safe to use for the normal 3 to 5 weeks. If they've been out longer than 2 hours (or 1 hour in heat above 90°F), discard them—bacterial growth at that point is too advanced to reverse with refrigeration.

Why do some people keep eggs on the counter and never get sick?

Luck and low bacterial load. Some eggs may have no Salmonella present, or the amount is so small that a healthy immune system fights it off. Older adults, young children, pregnant people, and those with weakened immunity are at much higher risk of serious illness from contaminated eggs. Refrigeration removes the gamble.

Do I need to wash eggs before I use them?

No. U.S. eggs are already washed at the processing plant. Washing them at home can actually introduce bacteria through the porous shell. If you're concerned about dirt on the outside, wipe it with a dry cloth just before cooking, not before storage.

Can I freeze eggs?

Yes, but not in the shell—the shell will crack as the contents expand. Crack eggs into a bowl, beat them lightly, and pour into ice cube trays or freezer bags. Frozen eggs last up to 4 months. Thaw them in the refrigerator overnight before cooking. Frozen eggs work well in baking and scrambled dishes but may have a slightly different texture than fresh eggs.

What's the difference between brown and white eggs for storage?

None. Shell color doesn't affect how long eggs last or how they should be stored. Brown and white eggs have the same shelf life and the same storage requirements. The color depends on the breed of chicken and has no bearing on freshness, nutrition, or safety.