How Long Does Sour Cream Last?

Sour cream's fairly short fridge window comes down to its already-high moisture content combined with a mild, cultured tang that makes early spoilage harder to catch by smell alone than with a more neutral dairy product — a genuinely sour smell beyond its normal tang, visible mold on the surface, or a watery layer that won't stir back in are the real signs a tub has turned, not just the normal thin liquid that separates naturally on top of an otherwise good container. An unopened tub generally holds a bit longer past its printed date than an opened one, since repeated scooping introduces new bacteria and air each time the lid comes off.

Keeping the lid pressed on tightly between uses, and using a clean spoon rather than one that's touched other food, meaningfully slows how fast an opened tub declines — cross-contamination from a used utensil introduces bacteria that speeds up spoilage well before the printed date would otherwise suggest trouble. Sour cream stored toward the back of the fridge, where the temperature stays most consistent, also holds its quality a bit longer than one kept in a door shelf that swings through a wider temperature range every time the fridge opens. Reduced-fat and fat-free versions tend to decline a bit faster than full-fat sour cream once opened, since their lower fat content offers slightly less of a natural barrier against the bacteria that eventually cause spoilage.

See Sour Cream's full storage & shelf-life guide (with spoilage signs) →