Short answer
No, raw eggs should not be left out overnight at room temperature if they were previously refrigerated. In the United States, fresh shell eggs are washed and sanitized, which removes the natural protective cuticle and can allow bacteria to enter; keeping them cold slows the growth of Salmonella Enteritidis. At room temperature (about 20–25°C or 68–77°F), bacteria can multiply to unsafe levels within hours. For shelf-stable or pasteurized eggs, rules differ. When in doubt, refrigerate and cook eggs to at least 71°C (160°F).
Why room temperature storage is risky for refrigerated raw eggs
In the U.S., conventional fresh shell eggs are washed and sanitized to reduce microbial contamination. This washing removes the natural cuticle and often requires refrigeration to prevent bacterial ingress and growth. If these eggs are left in the “danger zone” (4–60°C or 40–140°F) for more than about two hours, pathogens such as Salmonella can increase to levels that may cause illness. Leaving eggs out overnight typically exceeds this window, so refrigeration is the safer default.
Salmonella risk and symptoms
How Salmonella can be present in eggs
Salmonella Enteritidis can be present inside apparently normal eggs, even before shells are formed. It can also be introduced via contamination of the shell surface from the hen, the environment, or handling. While washing reduces visible dirt, it can also move bacteria closer to the porous shell if the egg is not dried and stored properly.
Health symptoms and severity
Infection with Salmonella can cause diarrhea, fever, abdominal cramps, nausea, and vomiting, usually 6–48 hours after consumption. Most people recover within a week, but young children, older adults, pregnant individuals, and those with weakened immune systems are at higher risk for severe illness and dehydration.
U.S. refrigeration and safety guidelines
The U.S. Department of Agriculture (USDA) and the Food and Drug Administration (FDA) recommend keeping eggs refrigerated at or below 4°C (40°F). If eggs were previously refrigerated, they should remain refrigerated until ready to cook. Do not wash eggs at home; washing can remove protective coatings and increase water uptake, which may facilitate contaminant movement. Use eggs before the date on the carton and store them in their original carton to reduce moisture loss and odor absorption.
Practical storage and handling rules
Follow these practical steps to manage raw eggs safely.
- Keep eggs refrigerated at ≤4°C (40°F) at all times unless the product is labeled shelf-stable.
- Do not leave raw eggs at room temperature for more than 2 hours (1 hour if the temperature is above 32°C or 90°F).
- Use raw eggs within 3–5 weeks of purchase and check for cracks before use.
- If you need eggs at room temperature for baking, take them out only when you are ready to use them and limit time in the “danger zone.”
- After cracking, cook eggs until both yolk and white are firm, or until dishes reach 71°C (160°F).
When can eggs be left out? Key comparisons
Not all eggs follow the same rules. Below is a comparison of common egg types and their room-temperature tolerance based on U.S. guidance and common industry practice.
| Egg type | Room-temperature tolerance (typical guidance) | Refrigeration needed | Notes |
|---|---|---|---|
| Fresh shell eggs (U.S., refrigerated) | Less than 2 hours at room temperature | Yes, continuous refrigeration | Washed shell; low pH and protective cuticle removed; cold chain is important. |
| Eggs in intact, unwashed nests (some regions) | Can be safe at room temperature for short periods if clean and uncracked | Often ambient in local use | Unwashed shells may retain the natural cuticle; practices vary by country. |
| Shelf-stable (UHT-treated) liquid eggs | Until opened; follow package guidance | Refrigerate after opening | Commercial pasteurization and aseptic packaging allow room-temperature storage pre-opening. |
| Pasteurized liquid eggs in cartons | Usually requires refrigeration even if unopened | Yes | Pasteurization kills pathogens; some products are still refrigerated for quality and regulatory reasons. |
| Frozen raw eggs | N/A | Keep frozen until thawed; then treat as fresh liquid eggs | Thaw in the refrigerator; do not refreeze after thawing. |
Cracked or dirty eggs: what to do
If an eggshell is cracked or visibly dirty, do not leave it at room temperature. Bacteria can enter through the crack or be present on the shell surface. If a crack occurs just before use, cook the egg immediately or move it to the refrigerator and use it within a day. For dirty eggs, wipe with a dry paper towel or clean cloth; if washing is necessary, do so just before use, dry thoroughly, and refrigerate promptly.
How to tell if raw eggs are still safe
Use your senses and reliable indicators:
- Check the carton date and store eggs in the back of the fridge where temperature is most consistent.
- Look for cracks before purchase and again before use.
- Float test (optional): place the egg in a bowl of cool, salted water. If it lies flat on the bottom, it is likely fresh; if it stands or floats, discard it.
- Odor and appearance: discard if the raw egg has a sour or unpleasant smell, or if the white is unusually thin or cloudy when cracked into a clean bowl.
Note: A float test is not a guarantee of safety from Salmonella; it mainly indicates freshness and overall quality.
Alternatives if you need shelf-stable options
If you want an egg product that can be stored at room temperature until opened, consider UHT-treated liquid eggs or pasteurized eggs labeled shelf-stable before opening. Once opened, these products typically require refrigeration and should be used according to the package instructions. For baking that calls for room-temperature eggs, plan ahead by taking the required number of refrigerated eggs out 30–60 minutes before use, but do not leave them out for extended periods.