Once opened, Spaghetti sauce (in jars) keeps about 4 days in the fridge. Unopened, it keeps about 18 months.
4 days opened in the fridge, against 18 months sealed in the pantry. Green is what this situation leaves you; husk is what it spends.
| Situation | Keeps for |
|---|---|
| Unopened · pantry | 18 months |
| Opened · fridge | 4 days |
Air and warmth are what shorten an opened item's life — the right container buys back the days the packaging gives up once the seal's broken.
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About 4 days refrigerated at 40°F (4°C) or below, according to USDA FoodKeeper v128. Refrigerate it once it's open.
Yes — keep Spaghetti sauce (in jars) at 40°F (4°C) or below once it's open. Cool, dry pantry unopened; refrigerate at 40°F (4°C) or below after opening.
Look for: Mould around the rim, cap, or surface; An off, fermented, or yeasty smell; Fizzing, bubbling, or a bulging lid; Separation or a colour change that won't stir back in. Those are the general signs for condiments & sauces — USDA FoodKeeper v128 publishes no spoilage note for Spaghetti sauce (in jars) specifically. Never taste something to test it — when in doubt, throw it out.