Oysters should not sit out for more than 2 hours at room temperature.

Oysters are highly perishable seafood that require proper temperature control to prevent bacterial growth. At room temperature (between 40°F and 140°F), harmful bacteria can multiply rapidly, making oysters unsafe to eat. The 2-hour rule applies to both raw and cooked oysters, whether they're still in the shell or shucked.

Safe storage times for oysters at different temperatures

Factors affecting oyster safety when left out

• Temperature: Higher temperatures accelerate bacterial growth
• Shell condition: Closed shells indicate live oysters; open shells that don't close when tapped should be discarded
• Humidity: Dry air can cause oysters to dehydrate and die faster
• Contamination: Exposure to unclean surfaces or utensils increases risk

Signs oysters have gone bad

Discard oysters that show any of these signs: strong fishy or ammonia-like odor, shells that remain open and won't close when tapped, cloudy or discolored meat, or slimy texture. When in doubt, throw them out - the risk of foodborne illness from spoiled oysters is serious.