Pesto
The answer
Opened pesto lasts ~1 week in the fridge.
Caution Oil-based pesto still needs refrigeration after opening.
How long it keeps
Fridge (40°F) ~1 week safe window
Freezer (0°F) 3–4 months best quality
Room temp 2 hours max then discard
Discard Discard if moldy, fermented-smelling, or fizzing.
The answer
Unopened pesto keeps Printed date in the pantry.
How long it keeps
Fridge (40°F) Not needed safe window
Freezer (0°F) 3–4 months best quality
Pantry Printed date OK stored right
Discard Discard bulging, leaking, or badly dented containers.
By state & packaging
State Fridge Freezer
Opened, refrigerated ~1 week 3–4 months
Unopened, pantry — —
Signs it has gone bad
✕ Mold at the cap or surface
✕ Fermented or off smell
✕ Separation with sour odor
FAQ
How long does opened pesto last?
About ~1 week refrigerated per FoodKeeper guidance. Follow the package date if it is shorter.