Potatoes are cheap enough that most people buy a bag, use four, and find the rest three weeks later with pale shoots coming out of them. That is not the potato going bad so much as the potato doing exactly what it is built to do, which is wait out the winter and then sprout.
Everything about storing them well comes down to convincing them it is still winter and still underground. Cold, but not refrigerator cold. Dark. Enough air that moisture does not collect. Get those three right and a bag of potatoes will hold for two to three months instead of two to three weeks.
The two things people most often get wrong are the fridge, which does something specific and irreversible to the starch, and storing potatoes next to onions, which is advice that gets repeated as a superstition when there is an actual mechanism behind it. Both are covered below, along with what to do with the ones that have already sprouted or gone green.
What You'll Need
- A paper bag, cardboard box, or open basket: Anything that breathes. Potatoes give off moisture, and moisture with nowhere to go turns into the soft brown spot that takes the rest of the bag with it. The plastic bag from the shop is the worst container in your kitchen for this, and it is the one most potatoes end up living in.
- A dark spot that stays cool: A pantry floor, the back of a low cupboard, an unheated garage, or a basement. What you are looking for is somewhere between 45 and 50 degrees. Light is the other half of it, because light is what turns potato skin green, and green means solanine.
- A board and mat you can peel over: Potatoes are the highest-waste vegetable most people prep, and peelings go everywhere. A ROO Mat sits under your board, grips the counter so the board does not skate while you are working through a bag, and its built-in pouch takes the peelings and the eyes as you go, so they end up in the compost instead of scattered across the counter.
How to Store Potatoes So They Last for Months, Step by Step
Do not wash them before storing
This is the first and most commonly broken rule. The thin layer of dry soil on a potato is doing a job: it keeps light off the skin and it keeps the surface dry. Washing introduces moisture that sits in the eyes and the crevices and starts rot. Wash them when you are about to cook them, not when you get home.
Sort the bag before you store it
One bruised or cut potato in a closed bag will spoil the ones touching it within a week or two. Tip the bag out, look for soft spots, cuts, and any that already smell sweet or fermented, and cook or discard those first. What is left goes into storage in good condition.
Move them out of plastic and into something that breathes
A paper bag with the top folded over, a cardboard box, or a wicker basket all work. If you are using a box, poke a few holes in the sides. The goal is airflow around each potato without light reaching them, which is why a mesh bag on an open shelf is only half a solution.
Find the coolest dark spot in the house that is not the fridge
Between 45 and 50 degrees is the target, which in most homes means a garage, a basement, an unheated utility room, or the floor of a north-facing cupboard. A kitchen cupboard next to the oven or above the fridge is the worst of both worlds, warm and dark, which is sprouting weather.
Keep them away from onions and from fruit
Onions and apples both release ethylene gas, which is a ripening signal, and potatoes respond to it by breaking dormancy and sprouting. Onions also give off moisture, which is the other thing potatoes do not want. Three feet apart or a closed door between them is enough. This is old kitchen advice with a real mechanism behind it.
Check on them every couple of weeks
Storage is not set and forget. Every two weeks, look through for soft spots, sprouts, and any green tinge, and pull those out. Five minutes of sorting is what turns a bag that lasts a month into a bag that lasts three.
Handle sprouted and green ones separately
A firm potato with small sprouts is fine: snap the sprouts off, cut out the eyes, and cook it soon. A potato that has gone soft and wrinkled with long shoots has spent its starch and is not worth cooking. Green skin means solanine, which is bitter and genuinely not good for you. A small green patch can be cut well away; a potato that is green through the flesh goes in the bin.
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Upgrade Your Prep: Get the ROO Bundle
ROO is a silicone mat that sits under your cutting board. It grips smooth countertops so the board never slides, and its built-in 7-cup pouch catches peels and trimmings as you cut. The Bundle includes the mat, a rubberwood board, and a reusable storage bag. $54.99.
Shop the ROO Bundle →Common Mistakes to Avoid
Below about 40 degrees, potatoes convert their starch into sugar. That gives them a sweet, slightly off taste, and it makes them brown much faster and darker when fried or roasted, because the extra sugar caramelises and burns before the inside is cooked. The change is largely reversible if you bring them back to room temperature for a week, but it is easier not to do it.
Sealed plastic traps the moisture potatoes give off. That moisture condenses, sits against the skin, and starts soft rot, which then spreads through the bag by contact. If the bag has ventilation holes it is workable, but a paper bag or an open box is better and costs nothing.
It looks good and it is the fastest way to sprout a bag of potatoes. Kitchen counters are warm and lit, which are the two conditions that end dormancy. A bowl on the counter is fine for the three or four you plan to cook this week, not for the rest of the bag.
The classic pairing in the vegetable rack, and it shortens the life of both. Onions release ethylene, which triggers potatoes to sprout, and potatoes release moisture, which softens onions. They want the same temperature and the same darkness, so keep them in the same room, just not in the same basket.
Upgrade Your Prep Workflow: The ROO Bundle
Potatoes generate more waste per pound than anything else most people cook. Peel five of them and you have a counter covered in wet strips that stick to everything, plus eyes and trimmings that fall off the board. The ROO Mat sits under your cutting board and grips the counter so the board stays put while you work through a bag, and its built-in 7-cup pouch takes the peelings straight off the board as you cut, so they go to the compost in one trip rather than being swept into a hand and carried across the kitchen. The Bundle adds a 13.75 inch by 9.75 inch rubberwood board and a reusable storage bag.
Upgrade Your Prep Workflow: Get the ROO Bundle
A pouch that catches the peelings instead of your counter.
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Frequently Asked Questions
Do potatoes last longer in the refrigerator or on the counter?
Neither is right. The fridge is too cold and converts starch to sugar, which affects taste and makes them burn when fried. The counter is too warm and too bright, and they will sprout within a couple of weeks. A dark, ventilated spot at 45 to 50 degrees beats both by a wide margin, and will hold potatoes for two to three months.
How long do potatoes last?
Roughly two to three months in proper cool dark storage, three to five weeks at normal room temperature in a paper bag, and one to two weeks in a bowl on a bright counter. New potatoes and thin-skinned varieties keep for noticeably less time than russets or other thick-skinned storage potatoes. Once peeled or cut, they need to be covered in cold water in the fridge and used within a day.
What is the best container for storing potatoes?
A paper bag with the top folded over, or a cardboard box with a few holes punched in the sides, sitting somewhere dark. Both give you airflow without light. Ceramic potato crocks and hessian sacks work on the same principle. What matters is that air can move and light cannot get in, not what the container is made of.
How far apart should onions and potatoes be stored?
Far enough that the ethylene from the onions is not concentrated around the potatoes, which in practice means a few feet, or separate closed containers, or one on a shelf and the other on the floor. They do not need different rooms. They just should not be sharing a basket, which is exactly where most kitchens put them.
Can you store sweet potatoes the same way?
Almost. Sweet potatoes want the same darkness and airflow but slightly warmer, around 55 to 60 degrees, and they are more sensitive to cold than regular potatoes. Below about 50 degrees they develop hard cores and an off flavour that does not cook out. A pantry shelf is usually better for sweet potatoes than a cold garage.
Cool, dark, dry, and away from the onions. That is the whole method, and it is the difference between a bag that lasts a fortnight and one that lasts the season. If you only change one thing, take them out of the plastic bag and off the counter.