Check for mold, especially green, blue, black, or pink spots
Look for a sour, rancid, or otherwise off smell
Notice any yellowing, darkening, or unusual discoloration
Discard if the texture is slimy, watery, or unusually lumpy
Discard if there is visible separation that does not mix back together
Discard if the container is swollen, leaking, or damaged
Discard if the sour cream tastes off, bitter, or spoiled
Discard if it is past the expiration date and shows any spoilage signs
Discard if it has been left out at room temperature for more than 2 hours
Discard if it has been left out for more than 1 hour in hot conditions