Once opened, Horseradish (in jar) keeps about 3–4 months in the fridge. Unopened, it keeps about 12 months.
3–4 months opened in the fridge, against 12 months sealed in the fridge. Green is what this situation leaves you; husk is what it spends.
| Situation | Keeps for |
|---|---|
| Unopened · fridge | 12 months |
| Opened · fridge | 3–4 months |
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 3–4 months refrigerated at 40°F (4°C) or below, according to USDA FoodKeeper v128. Refrigerate it once it's open.
Yes — keep Horseradish (in jar) 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. Those are the general signs for condiments & sauces — USDA FoodKeeper v128 publishes no spoilage note for Horseradish (in jar) specifically. Never taste something to test it — when in doubt, throw it out.