How Long Do Peanuts Last?
Opened peanuts keep 2–3 months in a cool, dry pantry, about 6 months in the fridge and up to 1 year in the freezer. Boiled peanuts are perishable and last only 3–4 days refrigerated.
Peanuts — opened
shelf life- Unopened: 1 year in the fridge
- Whole: 6–9 months in the fridge
- Cooked: 3–4 days in the fridge
Fridge at 40°F (4°C) or below · freezer at 0°F (−18°C). Freezer times are for best quality; frozen food stays safe longer.
Peanuts are legumes that grow underground, but they store like nuts: about half their weight is oil, which slowly turns rancid in warmth and air. Because they grow in soil, damp peanuts are prone to Aspergillus molds that produce aflatoxin, so dryness matters as much as temperature. Boiled peanuts are a separate case and are fully perishable.
How to store peanuts
- Keep peanuts bone dry. Store them in a sealed jar or can in a cool cupboard, never in a damp garage or basement where mold can take hold.
- Refrigerate or freeze raw, unroasted peanuts. They hold more moisture than roasted ones and both mold and turn rancid sooner at room temperature.
- Treat boiled peanuts like cooked beans: refrigerate them within 2 hours, eat within 3–4 days, or freeze them in a little of the cooking brine.
- Put the plastic lid back on a can of cocktail peanuts after every use; salted roasted peanuts go stale and soft quickly once humidity gets in.
- Store in-shell peanuts in a breathable bag or an open bowl in a dry spot for short-term snacking, and freeze the rest.
How to tell if peanuts have gone bad
- A sour, paint-like or old-oil smell and a bitter taste, which mean the oil has gone rancid.
- Any mold, gray-green or black dust on shells or kernels, or a musty smell. Discard the whole batch without tasting; peanut molds can carry aflatoxin.
- Shriveled, darkened or discolored kernels inside an otherwise normal-looking shell.
- Soft, soggy texture in roasted peanuts, from absorbed moisture.
- Boiled peanuts that are slimy, fizzy or sour-smelling.
Bacteria that cause food poisoning usually do not change the look, smell or taste of food. Go by the time limits first, and the signs above second.
Peanuts shelf life chart
| State | Fridge | Freezer | Pantry |
|---|---|---|---|
| Opened | 6 months | 1 year | 2–3 months |
| Shelled, roasted peanuts in a sealed jar or can. | |||
| Unopened | 1 year | 1 year | 6 months |
| Vacuum-sealed cans and jars; go by the best-by date if it is later. | |||
| Whole | 6–9 months | 1 year | 2–4 months |
| Roasted, in the shell. Keep them dry; damp shells mold. | |||
| Cooked | 3–4 days | 6 months | Not safe |
| Boiled peanuts. Refrigerate within 2 hours; freeze them in some of their brine. | |||
Not safe = perishable: no more than 2 hours at room temperature (1 hour above 90°F / 32°C). Not recommended = possible, but quality suffers or it serves no purpose.
Frequently asked questions
How long do boiled peanuts last?
Boiled peanuts last 3–4 days in the refrigerator and about 6 months in the freezer. They are wet, cooked legumes, so the 2-hour rule applies: do not leave them out longer than that, or 1 hour in heat above 90°F (32°C). A roadside bag left in the car all afternoon should be thrown away.
Is it safe to eat moldy peanuts if I pick off the bad ones?
No. Throw out the whole batch. Molds that grow on peanuts can produce aflatoxin, which is not destroyed by roasting or cooking and may be present in nuts that look normal. Commercial peanuts are screened for it, but peanuts that mold at home from damp storage are not worth the risk.
Do peanuts in the shell last longer than shelled peanuts?
Slightly. The shell protects the kernel from light and air, so roasted in-shell peanuts keep 2–4 months in the pantry and 6–9 months in the fridge. The shell also traps moisture, though, so they must stay dry. For long storage of either kind, the freezer is best.
Can old peanuts make you sick?
Stale or rancid peanuts mostly just taste bad, though they can upset your stomach. The real hazard is mold, which you cannot always see. Discard peanuts that smell musty, show any mold, look shriveled and dark, or have been stored somewhere damp, regardless of the date on the package.
Related foods
| Food | Fridge | Freezer | Pantry |
|---|---|---|---|
| Peanut Butter Opened |
6–9 months | 6 months | 2–3 months |
| Mixed Nuts Opened |
6 months | 1 year | 2–3 months |
| Cashews Opened |
6 months | 1 year | 2–4 months |
| Almonds Opened |
1 year | 1–2 years | 4–6 months |
| Trail Mix Unopened |
6–12 months | 1 year | 6 months |
| Granola Bars Unopened |
Not recommended | Not recommended | 6–8 months |
Reviewed 2026-09-20. Times follow published USDA FoodKeeper / FSIS, FDA and CDC storage guidance; where sources differ we use the shorter time. How we compile this data.