Check the expiration or “best by” date
Look for cracks, leaks, or unusual slime on the shell
Do the float test in a bowl of water
Crack the egg into a separate bowl and check for a bad smell
Inspect the egg white and yolk for unusual color or texture
Trust any sour, sulfur-like, or rotten odor
Discard eggs that have been left out at room temperature for more than 2 hours
Discard eggs that were refrigerated but show signs of spoilage
When in doubt, throw it out