Once opened, Pesto (jarred) keeps about 3 days in the fridge. Unopened, it keeps about 6 months.
| Situation | Keeps for |
|---|---|
| Unopened · fridge | 6 months |
| Opened · fridge | 3 days |
| Freezer | 1 month |
About 3 days refrigerated at 40°F (4°C) or below, according to USDA FoodKeeper v128. Refrigerate it once it's open.
Yes — keep Pesto (jarred) at 40°F (4°C) or below once it's open. Refrigerate at 40°F (4°C) or below.
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. Never taste something to test it — when in doubt, throw it out.
Yes — USDA FoodKeeper v128 gives about 1 month in the freezer at 0°F (−18°C). Frozen food stays safe indefinitely; that window is about quality, not safety.