Unopened yogurt keeps 1–2 weeks past the printed date; once opened, eat it within about 5–7 days. Yogurt can be frozen for 1–2 months, though it separates on thawing.
Fridge
1–2 weeks sealed · 5–7 days opened
Freezer
1–2 months (best for cooking or smoothies)
Counter / pantry
2 hours maximum
Store it right
Use a clean spoon every time to avoid introducing bacteria.
Pour off, or stir in, the natural whey rather than discarding it.
Store deep in the fridge, not in the door.
Signs it has gone off
Mould, pink or orange spots
Curdled, watery-lumpy texture
Yeasty or fizzy smell
Rescue ideas
Whisk into marinades — the acid tenderises chicken and lamb.
Strain overnight into labneh with salt and olive oil.
Swap for buttermilk in cakes, scones and flatbreads.