How Long Can Pizza Sit Out?
Quick Answer
Pizza should not sit out at room temperature for more than 2 hours, or 1 hour if it's above 90°F. After that, bacteria can multiply to unsafe levels and it should be discarded.
Duration by Type
USDA maximum before discarding
Shortened danger-zone window
Store within 2 hours of serving
Best-quality window
Quick Answer
Cooked pizza is safe at room temperature for no more than 2 hours, following the USDA's rule for perishable foods. In hot conditions above 90°F, such as outdoors in summer, that window drops to just 1 hour. Beyond these limits, bacteria multiply rapidly in the "danger zone" between 40°F and 140°F, and the pizza should be thrown away even if it looks and smells fine.
Pizza Safety by Situation
| Situation | Safe Time Out | Then |
|---|---|---|
| Room temperature (under 90°F) | Up to 2 hours | Refrigerate or discard |
| Hot day / outdoors (over 90°F) | Up to 1 hour | Refrigerate or discard |
| Refrigerated (40°F or below) | 3–4 days | Reheat or discard |
| Frozen (0°F) | 1–2 months | Best quality window |
The 2-hour rule applies to the total time out of refrigeration, so an hour on the counter at the party plus another hour in the car counts as two hours combined.
Why the 2-Hour Rule Matters
Pizza contains cheese, sauce, and often meat, all perishable foods that support bacterial growth. Harmful bacteria like Staphylococcus aureus and Salmonella thrive in the danger zone. Some produce toxins that are not destroyed by reheating, which is why you cannot make unsafe pizza safe again by warming it up. Overnight on the counter, even if it looks okay, means it should be discarded.
Factors That Affect How Long It Lasts
- Room temperature: Warmer rooms shorten the safe window.
- Toppings: Meat and seafood toppings are especially perishable.
- Humidity: Moisture can speed spoilage.
- Initial handling: How the pizza was stored before serving matters.
How to Store Pizza Safely
- Refrigerate leftovers within 2 hours in a shallow airtight container or wrapped in foil.
- Eat refrigerated pizza within 3 to 4 days.
- Freeze for longer storage; it keeps its best quality for 1 to 2 months.
- Reheat to 165°F, ideally in an oven or skillet for better texture than a microwave.
- When in doubt, throw it out; the small savings are not worth food poisoning.
Bottom Line
That slice left on the counter overnight is not safe, no matter how tempting. Stick to the 2-hour rule (1 hour when hot), refrigerate promptly, and reheat thoroughly to enjoy leftovers without risk.
Pro Tips
Count total time out of the fridge — an hour at the party plus an hour in the car equals the 2-hour limit.
— USDA
Reheating won't destroy toxins some bacteria leave behind, so discard pizza left out overnight.
— FDA
Refrigerate leftovers within 2 hours in a shallow airtight container and eat within 3–4 days.
— USDA