Grandma Knows: How to Store Potatoes Correctly

A bag of potatoes sitting on the kitchen counter seems harmless enough. But within a week or two, something goes wrong. They sprout little white shoots, turn soft in places, or develop a faint greenish tint under the skin. You end up throwing half of them away, wondering what happened.

The truth is, potatoes are more sensitive to their environment than most people realize. Temperature, light, humidity, and even what's stored nearby can all affect how long they last. Understanding why these things matter makes it much easier to get storage right — and to stop wasting food.

Why Potatoes Go Bad So Quickly in the Wrong Conditions

Potatoes are living things, even after they've been harvested. They continue to breathe, release moisture, and respond to the conditions around them. When those conditions are wrong, the potato's own biology works against you.

Light is one of the biggest problems. When potatoes are exposed to light — even indirect indoor light — they begin producing a compound called solanine. This is what causes the green patches you sometimes see just under the skin. Solanine is a natural defense mechanism the plant developed to protect itself, but in larger amounts it can cause bitterness and, if eaten in large quantities, stomach discomfort. A potato that has turned deeply green throughout is best discarded. One with a small green patch near the surface can usually be cut away and the rest used safely.

Heat accelerates everything. Warmth speeds up the sprouting process and encourages the growth of mold. A potato sitting in a warm kitchen near the stove or oven is under real stress. It will sprout faster, soften more quickly, and begin to shrink as it loses moisture.

Moisture is a double problem. Too much humidity encourages rot and mold. Too little causes potatoes to dry out, shrivel, and become mealy in texture. The ideal storage environment threads a careful line between the two.

The Conditions Potatoes Actually Need

The best storage conditions for potatoes are cool, dark, dry, and well-ventilated. Each of those four qualities matters for a specific reason.

Cool means somewhere between 45°F and 55°F (about 7°C to 13°C). This temperature range is cold enough to slow down sprouting and decay, but not so cold that the potato's starches convert to sugar — which is what happens in the refrigerator and why refrigerated raw potatoes taste oddly sweet when cooked.

Dark prevents the solanine problem described above. Even a paper bag over the top of a basket can make a real difference if you don't have a dedicated storage area.

Dry means no standing moisture. Potatoes should never be stored wet. If they're damp when you bring them home, spread them out and let them air-dry for an hour or two before putting them away.

Ventilated means air can circulate. Potatoes release carbon dioxide and small amounts of moisture as they breathe. Without airflow, that moisture builds up, and rot sets in. This is why a sealed plastic bag is one of the worst places to store potatoes — the condensation inside creates exactly the conditions mold needs.

Where to Store Potatoes at Home

The ideal spot is a cool pantry, a cellar, or an unheated basement. These places stay naturally cool and dark through much of the year, which is exactly why households with root cellars historically had very little food waste from root vegetables. The design of those spaces was not accidental — it was the result of generations learning what worked.

In a modern home without a cellar, you'll need to find the closest equivalent. A lower kitchen cabinet away from the oven and dishwasher is a reasonable option. The back of a pantry shelf works well if it stays cool. Some people use an unheated mudroom, garage, or even a cool closet near an exterior wall in winter months.

Avoid storing potatoes near the stove, next to the refrigerator's exhaust vent, or anywhere that receives direct sunlight through a window. A cupboard that sits above a dishwasher gets warm every time the machine runs a cycle — not ideal.

The Container Makes a Difference

What you store potatoes in affects how long they last, sometimes dramatically.

A wooden crate, a wicker basket, a paper bag left open at the top, or a mesh produce bag all allow air to circulate freely. These are the best everyday options. The material itself doesn't matter as much as the airflow does.

Cardboard boxes work reasonably well for short periods, though they can trap a small amount of moisture over time. If you're using a cardboard box, make sure it's not sealed and that there are gaps or holes in the sides.

Plastic bags — especially sealed ones — are problematic. The moisture the potatoes naturally release has nowhere to go, and you'll often find soft, wet, rotting spots developing at the bottom of the bag within days. If potatoes come home in a plastic bag from the store, transfer them to something breathable as soon as you can.

Burlap sacks are worth mentioning here. They've been used for potato storage for a very long time and for good reason. The weave allows excellent airflow while keeping light out and offering a small amount of insulation against temperature swings. If you buy potatoes in bulk, a burlap sack stored in a cool corner is still one of the most practical storage methods available.

Keeping Potatoes Away from Other Produce

This is a detail that often gets overlooked, and it has a noticeable effect on how long potatoes last.

Onions and potatoes should not be stored together. Both release gases during storage, and the combination shortens the life of both. Onions give off moisture and gases that encourage potatoes to sprout more quickly. Potatoes, in turn, can cause onions to soften faster. Keep them in separate areas, ideally in different parts of the kitchen or pantry.

Apples, bananas, and other ethylene-producing fruits should also be kept away. Ethylene is a natural ripening gas that fruits release as they mature. It has the same accelerating effect on potatoes — speeding up sprouting and softening. A fruit bowl sitting next to a bag of potatoes on the counter is quietly doing damage.

On the other hand, there is an old household practice of placing a raw apple inside a bag or box of potatoes to slow down sprouting. The reasoning given was that the apple somehow balanced the environment. Whether this reliably works is debated, and the results vary widely depending on the apple variety and how ripe it is. If you're interested in trying it, use a single firm, fresh apple — not one that's already very ripe — and replace it regularly. But in practice, controlling temperature and light will do far more than any single piece of fruit.

What to Do with Potatoes That Have Already Sprouted

A potato with small sprouts is not necessarily ruined. The sprouts themselves contain concentrated amounts of solanine, but the rest of the potato is usually still usable if it's still firm to the touch.

Remove the sprouts completely by cutting them off or digging them out with the tip of a knife or a vegetable peeler with a pointed tip. Cut generously around the base of each sprout — not just the visible growth, but a small area of potato flesh around it. Once the sprouts are removed and the potato is peeled and cut, check that the flesh inside looks white or pale yellow and smells normal. If it does, it can be cooked and eaten without concern.

A potato that has sprouted and also become noticeably soft, wrinkled, or shrunken has lost too much moisture to be worth saving. At that stage, the texture after cooking will be dry and mealy rather than smooth and fluffy. It's better composted than cooked.

Storing Potatoes in Warmer Months

Summer creates a real challenge for potato storage. Kitchens heat up, pantries get warmer, and there may not be a naturally cool space available anywhere in the house. In this situation, you have a few practical options.

Buy smaller quantities more frequently. This is the most straightforward solution — rather than keeping a large bag on hand, buy just what you'll use within the week. The trade-off in convenience is worth the reduction in waste.

If you have a garage, a corner that stays shaded and doesn't heat up too much in summer can work. Some garages remain reasonably cool even in warm months if they're well-insulated. Check the actual temperature rather than assuming — what feels cool to you may still be warm enough to accelerate sprouting.

The refrigerator should be treated as a last resort for raw whole potatoes. The cold converts the potato's starches into sugars, which changes the flavor and can also cause uneven browning when frying or roasting. If you must refrigerate potatoes, let them sit at room temperature for a day or two before cooking to allow some of the sugars to convert back. This doesn't fully reverse the change, but it helps.

When You've Already Cut or Peeled Potatoes

Cut or peeled raw potatoes are a different situation entirely. Once the skin is broken, the potato flesh is exposed to air and begins to oxidize — turning gray or brownish within minutes. The potato hasn't gone bad; it's just an enzyme reaction between the potato's natural compounds and oxygen.

The reliable fix is cold water. Submerge cut potatoes in a bowl of cold water as soon as they're peeled. This cuts off their access to oxygen and halts the browning. You can keep them in cold water in the refrigerator for up to 24 hours without any loss of quality. Change the water once if you're storing them longer than a few hours.

Don't add salt to the soaking water if you plan to store them overnight — salt draws moisture out of the potato and can affect the texture. Plain cold water is all you need.

If you've cooked more potatoes than you need, cooled leftover potatoes can be refrigerated in a sealed container for three to four days without any issue. Cooked potatoes don't have the same starch-conversion problem as raw ones.

Seasonal Storage and Buying in Bulk

Buying potatoes in larger quantities at the end of summer or early fall — when locally grown varieties are freshly harvested — is a practice that made a great deal of sense before year-round grocery availability. Freshly harvested potatoes have a natural protective skin called a cure that has fully hardened, which helps them resist moisture loss and damage during storage. Potatoes that have been sitting in a distribution warehouse for months may already be partway through their shelf life before you bring them home.

If you're buying in bulk for longer storage, inspect each potato carefully before putting it away. One soft or rotting potato in a crate will accelerate decay in the ones surrounding it — the expression about a bad apple applies equally here. Sort through the bag, remove anything damaged or already sprouting, and spread the rest out briefly so they're not touching before you put them into storage.

Check on stored potatoes every week or two. Remove anything that's starting to soften, and make sure the storage area hasn't become damp or significantly warmer than usual. A small amount of regular attention keeps the rest of the batch in good condition much longer than simply putting them away and forgetting them.