Ketchup
The answer
Opened ketchup lasts 6 months in the fridge.
How long it keeps
Fridge (40°F) 6 months safe window
Freezer (0°F) Do not freeze best quality
Room temp Brief table use is fine then discard
Discard Discard if it smells yeasty or fermented, bubbles, or shows mold at the cap.
The answer
Unopened ketchup keeps in the pantry until, and up to a year past, its printed date.
How long it keeps
Fridge (40°F) Not needed safe window
Freezer (0°F) Do not freeze best quality
Pantry Up to 1 year past date OK stored right
Discard Discard bulging or leaking bottles.
By state & packaging
State Fridge Freezer
Opened, refrigerated 6 months —
Unopened, pantry — —
Signs it has gone bad
✕ Yeasty or fermented smell
✕ Bubbling or hissing on opening
✕ Mold around the cap
FAQ
Does ketchup really need refrigeration?
After opening, yes — for quality and to reach the 6-month window. Restaurant table bottles turn over too fast to matter.