Can Eggs Sit Out Overnight?

Why eggs left out overnight are risky

US store-bought eggs are refrigerated foods. They're commercially washed before sale, which removes surface bacteria but also strips away the egg's natural protective cuticle. Without that cuticle, bacteria such as Salmonella can penetrate the shell more easily once an egg warms to room temperature. See the official food-safety sources used by StillSafeFood for references.

The 2-hour rule for eggs

Eggs are a perishable refrigerated food. The USDA recommends discarding perishable foods — including eggs — left at room temperature for more than 2 hours. Eggs should be cooked to 160°F (71°C) and stored at or below 40°F (4°C) the rest of the time.

The 1-hour rule above 90°F

When the ambient temperature is above 90°F (32°C) — a hot kitchen, a summer cookout — the safe window for eggs shrinks to just 1 hour. Past that point, the same discard guidance applies regardless of how the eggs look or smell.

U.S. refrigerated eggs vs. unrefrigerated eggs in other countries

In some countries, eggs are not commercially washed, so the natural cuticle stays intact and unrefrigerated counter storage is common practice there. This page is focused on US store-bought eggs, which are washed and sold refrigerated — they need continuous refrigeration and don't follow the same room-temperature rules. If you know your eggs were sold unrefrigerated and handled under a different food system, different guidance may apply; when in doubt, refrigerate.

Raw shell eggs vs. cracked eggs

An intact shell slows contamination from outside the egg, but it does not stop bacteria already on or in the egg from multiplying once it's left at room temperature for too long — the 2-hour rule applies the same way to unopened, uncracked eggs. Cracked raw eggs lose even that limited protection and should be refrigerated and used promptly; don't leave cracked eggs out at all.

Hard-boiled eggs and peeled boiled eggs

Hard-boiled eggs — peeled or unpeeled — follow the same 2-hour rule as raw eggs. The shell offers no meaningful protection once an egg has been cooked. Refrigerate hard-boiled eggs within 2 hours of cooking, and use them within 1 week if stored safely. See can boiled eggs sit out overnight for a full breakdown, including peeled vs. unpeeled storage.

Cooked egg dishes, omelets, quiche, and casseroles

Omelets, scrambled eggs, quiche, frittatas, and egg casseroles follow the standard 2-hour cooked-food rule. Refrigerate within 2 hours of cooking and use within 3–4 days — the same window as other cooked leftovers.

Can you cook eggs that sat out overnight?

Cooking eggs to 160°F (71°C) kills most live bacteria, but it does not reliably undo the risk from eggs that sat out too long, and it won't destroy any heat-stable toxins that may have already formed. Cooking does not always make eggs safe after unsafe storage — see does reheating make food left out overnight safe for the same principle applied more broadly. The safer choice is to discard eggs left out overnight rather than cook them.

Can you put eggs back in the fridge the next morning?

If eggs were out for less than 2 hours (1 hour above 90°F) and the room temperature was normal, returning them to the fridge is generally fine. If they've been out overnight or longer than 2 hours, refrigerating them the next morning does not make them safe again — discard them instead.

What if the eggs smell fine?

Smell, taste, and appearance are not reliable safety tests for eggs. A strong sulfur smell is a sign of spoilage, but eggs can carry harmful bacteria like Salmonella with no noticeable smell, taste, or appearance change at all. Go by how long the eggs sat out, not your senses.

Eggs left in a car, lunchbox, grocery bag, or delivery order

A parked car can heat up well past 90°F within minutes, dropping the safe limit for eggs to 1 hour. An insulated lunchbox or grocery bag without ice packs doesn't reliably keep eggs below 40°F — treat it the same as counter storage. The same applies to a grocery delivery left on a porch: if you don't know how long it sat out, or the weather was warm, the safer choice is to discard the eggs.

Safe vs. not safe examples

How to store eggs safely

• Keep eggs refrigerated at 40°F (4°C) or below at all times.
• Return eggs to the fridge within 2 hours of taking them out (1 hour above 90°F).
• Cook eggs to 160°F (71°C).
• Refrigerate hard-boiled eggs within 2 hours of cooking; use within 1 week.
• Refrigerate cooked egg dishes within 2 hours of cooking; use within 3–4 days.

What to do after a power outage

If the power went out, the 2-hour rule still applies — measured from when the fridge actually warmed past 40°F, not from when the power went out. A closed refrigerator generally holds a safe temperature for about 4 hours. See is food safe after a power outage for what to keep and what to throw away. Not sure about a specific dish? Use the StillSafeFood checker for a quick, conservative answer.