You bought a bag of potatoes and are debating whether they go in the pantry or the fridge. Or you baked a potato for dinner and don’t know how to save half of the leftovers. The answer is different depending on whether the potato is raw or cooked, and for raw potatoes, refrigeration is the wrong choice for a reason most people don’t know.
Do the potatoes need to be refrigerated?
Short answer: Raw potatoes do not need to be refrigerated. Cold temperatures convert the starch in potatoes to sugar, which changes the flavor and creates problems in cooking, especially frying and roasting. A cool dark pantry between 45 and 55 degrees Fahrenheit is the right place. Cooked potatoes should be refrigerated and used within 3 to 5 days. Baked potatoes should be removed from the baking paper before they are placed in the refrigerator.
For storage time and signs of spoilage, see our post Potatoes going bad? or browse the whole Food storage guide.
To take the keys
- Raw potatoes: dark pantry, not in the refrigerator
- Refrigeration of raw potatoes turns the starch into sugar, spoiling the quality for frying and roasting
- Exception: If you boil or mash, refrigeration is safe and extends shelf life
- Boiled potatoes: they must be cooled within 2 hours, used within 3 to 5 days
- Wrapped Baked Potatoes: Remove foil before cooling
- Cut raw potatoes: cool by immersing in cold water, use within 24 hours
- Raw potatoes do not freeze well; cooked potatoes are frozen for 12 months
Why raw potatoes should not be put in the refrigerator
Refrigerating whole raw potatoes seems to me to be a safe and sensible option. It’s wrong for most situations, and for a specific chemical reason.
When potatoes are stored below 42 degrees Fahrenheit (6 degrees Celsius), which includes the temperature of most home refrigerators, a process called cold sweetening occurs. The cold activates enzymes in the potato to reduce the stored starch to sugar, mainly glucose and fructose. This makes the potatoes sweeter than expected, which seems harmless. The problem appears in cooking.
When a high-sugar potato is exposed to high heat, the sugars react with the amino acids in a process known as the Maillard reaction, which causes the potato to brown excessively and unevenly before cooking. Fried or baked potatoes in the refrigerator turn dark brown or black on the outside while remaining undercooked on the inside. Commercial manufacturers of fries and potato chips carefully control storage temperatures to limit cold sweetening, which is why cooling raw potatoes at home causes this browning problem for high-heat applications.
For boiling and crushing, cold sweetening does not matter. The added sweetness is not detected in the mashed potatoes and the browning reaction does not occur in boiling water. If you only boil or mash potatoes, chilling raw potatoes is safe and significantly extends shelf life.
Where to store raw potatoes
The ideal storage environment for whole raw potatoes is cool (45 to 55 degrees Fahrenheit), dark, and well-ventilated. A pantry, closet, basement or cellar that is kept in this temperature range is a good choice. A paper bag, wire basket, or cardboard box provides the airflow they need. Do not use plastic bags, which trap moisture and accelerate mold growth and germination.
Darkness matters as much as temperature. Exposure to light produces chlorophyll and solanine, a natural toxin that is a safety concern for green-skinned potatoes. A bag of potatoes left on a shiny counter or near a kitchen window can start to turn green within days.
Do not wash potatoes before storing. Skin moisture accelerates rotting and sprouting. Wash only when you are ready to cook.
The cooked potatoes must be cooled
After cooking the potato, refrigeration is mandatory. Cooking introduces moisture and heat into potatoes that can make them potentially dangerous foods, according to the Michigan State University Extension. The two-hour rule applies: boiled potatoes left at room temperature for more than two hours should be immediately cooled or discarded.
Store cooked potatoes in an airtight container in the refrigerator and use within 3 to 4 days according to the USDA FoodKeeper app. This applies to all forms: baked, boiled, pureed, roasted or scalloped. Boiled potatoes should be cooled as quickly as possible before being refrigerated. For large quantities of mashed or roasted potatoes, spread them out in a shallow bowl to cool.
Paper wrapped baked potato warning
This is the most important food safety point in this post and one that most people miss. Potatoes wrapped in aluminum foil and left to cool in the oven create a warm, humid and low-oxygen environment after the oven is turned off. These are the conditions that allow Clostridium botulinum spores to germinate and produce botulinum toxin. Baked potatoes wrapped in paper have been linked to outbreaks of botulism and are specifically flagged by the USDA and Michigan State University Extension as a food safety hazard.
The fix is simple: remove the foil before putting the potato in the fridge. Store potatoes in an airtight container or wrap them in plastic wrap instead. Refrigerate within two hours of cooking. Don’t leave foil-wrapped baked potatoes on the counter overnight, even if you want to refrigerate them in the morning.
Never leave these at room temperature
- Boiled potatoes in any form: 2 hour limit. Refrigerate or discard.
- Baked potatoes wrapped in paper: Remove the foil before cooling. Don’t leave it wrapped overnight.
- Cut the raw potatoes from the water: They oxidize and degrade quickly. Immerse in cold water and immediately refrigerate.
- Potato salad or potato-based dishes with mayonnaise or dairy products: The 2 hour limit applies to the entire dish.
See also
Fast Storage Reference
- Whole raw potato: Pantry or dark cupboard, paper bag or basket, 3 to 5 weeks. Do not refrigerate (unless boiling or crushing).
- Cut the raw potato: Immersed in cold water, in airtight containers, in the refrigerator. Use within 24 hours.
- Baked potato: Remove foil, airtight container or loose plastic wrap, refrigerate within 2 hours. Use within 3 to 4 days.
- Mashed potatoes: Airtight container, refrigerate within 2 hours. Use within 3 to 4 days. Freeze for up to 12 months.
- Roasted or boiled potato: Airtight container, refrigerate within 2 hours. Use within 3 to 4 days.
Why Pantry Works for Whole Potatoes
Potatoes are underground tubers that can be stored in cool, dark and stable conditions during the winter. Their skin is a natural barrier against moisture loss and light exposure. The ideal home storage temperature (45 to 55 degrees Fahrenheit) is cooler than most kitchens but warmer than most refrigerators, so a basement, cellar, or indoor pantry away from heat sources is the best option for most home cooks. Proper post-harvest curing (skin drying and hardening) is why farm-fresh or farmer-market potatoes last longer than supermarket ones, which may be stored in commercial cold storage and partially sweetened before reaching your kitchen.
Further reading
Should potatoes be refrigerated FAQ?
I have already refrigerated my raw potatoes. Are they damaged?
For frying or roasting, yes, it has affected the quality. The cold sweetening process starts quickly at refrigerator temperatures, and the resulting high sugar content will cause the potatoes to brown unevenly and excessively in high heat. Boiled or mashed, they are still good. The sweetness of the cold sweetening is largely undetectable in the mashed potatoes. If you need to fry or roast them, bring them to room temperature for 30 minutes before cooking and be ready to brown them.
Can I leave a baked potato out overnight?
no Baked potatoes left at room temperature for more than two hours should be discarded. If wrapped in paper, the risk is greater because after cooking, the paper creates a low-oxygen environment that supports the growth of Clostridium botulinum. Remove the foil, refrigerate for two hours after cooking, and the potato is safe for 3-4 days in the refrigerator.
Why did my french fries turn black?
Almost certainly because the fries were cooled before frying. Cold sweetening converts potato starch into glucose and fructose. When these sugars are exposed to the high heat of the frying oil, they caramelize and burn in the Maillard reaction before the potato is cooked, producing a dark brown or black color on the outside. The potatoes do not spoil, but the quality is compromised. Next time, store raw potatoes in a cool pantry and let them come to room temperature before frying.
How long can cut potatoes stay in water in the refrigerator?
up to 24 hours Immersion of raw cut potatoes in cold water and refrigeration prevents the enzymatic browning that occurs when the cut surface is exposed to air. After 24 hours, the potato starts to lose its starch and flavor in the water and its texture begins to degrade. For best results, cut and save the water for use during that window and the night you plan to cook the potatoes. Change the water once every 24 hours.
Better Living may earn commissions through affiliate links and may occasionally feature sponsored or partner content. If you make a purchase through our links, we may receive a small commission at no cost to you.
