This is probably the question you really came here for.
If they're whole, raw potatoes and they've spent a week in a suitable storage area, don't automatically throw them away.
Instead, inspect them.
Look for:
- Firm texture
- Normal skin color
- No significant mold
- No leaking or wet, mushy areas
- No strong rotten odor
- No extensive green discoloration
- No severe shriveling or deterioration
A potato that is slightly wrinkled or has started to sprout isn't necessarily the same thing as a potato that is rotten.
But it does deserve a closer inspection.
What Does a Bad Potato Look Like?
Potatoes give you several clues when they're no longer in good shape.
Soft or Mushy Areas
A potato that's becoming extremely soft, wet, or mushy is a good candidate for the trash.
Especially if the softness is accompanied by a bad smell or visible decay.
Mold
Visible mold is a clear sign that the potato is deteriorating.
Don't simply cut away a large area of mold and assume the entire potato is fine.
When in doubt, discard it.
A Strong Rotten Smell
Fresh potatoes have a mild earthy smell.
A strong, unpleasant, rotten odor is a completely different story.
If you open the bag and immediately think, "Something is definitely wrong here," listen to that warning sign.
Extensive Green Skin
This one deserves special attention.
Potato tubers exposed to light can develop green skin, and excessive greening is associated with elevated glycoalkaloids. University of Minnesota Extension advises removing green areas before cooking and says potatoes with extensive green areas should not be consumed.
So don't treat a heavily green potato as simply an ugly potato.
When the greening is extensive, it's safer to discard it.
What If My Potato Has Sprouted?
This is another situation that can make people nervous.
Potatoes naturally begin to sprout as they age, especially when stored for longer periods.
University of Minnesota Extension recommends removing sprouts before preparing potatoes and notes that potato sprouts can be toxic.
A potato with a small amount of sprouting isn't automatically the same as a rotten potato, but it should be inspected carefully.
If the potato is also:
- Very soft
- Heavily shriveled
- Green
- Moldy
- Rotten-smelling
it's best to throw it away.
When there are multiple signs of deterioration, there's little reason to take a chance.
Should You Put Potatoes in the Refrigerator?
This is where things get a little more interesting.
Refrigeration isn't automatically necessary for whole raw potatoes in ordinary household storage.
And depending on how you plan to cook them, very cold storage can affect potato quality. University of Minnesota Extension specifically notes that potatoes intended for frying are generally stored around 40–50°F to avoid cold-induced sweetening, which can contribute to discoloration during frying.
So if Grandma kept her potatoes out of the refrigerator, she wasn't necessarily doing something wrong.
She may simply have been following a traditional storage method that worked well for the conditions she had.
Why Did Our Grandparents Store Potatoes Differently?
This is one of those kitchen habits that makes more sense when you think about how homes were traditionally organized.
Before modern refrigerators became a standard part of every kitchen, people had to find naturally cool places to store foods.
Root cellars, basements, pantries, cupboards, and cool storage rooms could provide relatively stable conditions.
Potatoes were particularly well suited to this kind of storage because whole raw potatoes are not the same type of highly perishable food as cooked potatoes, meat, dairy, or prepared leftovers.
And there's something wonderfully practical about it.
No special equipment.
No complicated containers.
Just a cool, dark place and regular inspection.
Counter vs. Pantry: Which Is Better?
If you have the choice, I'd choose a cool, dark, well-ventilated storage spot over an exposed countertop.
Countertop
Works best when:
- The room is relatively cool
- The potatoes aren't exposed to sunlight
- They're away from heat-producing appliances
- You use them fairly quickly
Pantry or Cupboard
Often a better everyday option because it protects potatoes from light.
Just make sure the space isn't hot, damp, or poorly ventilated.
Refrigerator
Not automatically necessary for whole potatoes, and particularly cold storage can affect frying quality.
The best choice depends partly on how quickly you'll use them and how you plan to cook them.
Don't Confuse Raw Potatoes With Cooked Potatoes
This is a really important distinction.
A whole raw potato sitting in your pantry for a week is not governed by the same storage rules as leftover mashed potatoes sitting on the counter.
Cooked potatoes are perishable foods.
USDA guidance says cooked potatoes and other cooked vegetables can generally be kept in the refrigerator for 3–4 days.
And USDA's general food-safety guidance says perishable foods shouldn't remain at room temperature for more than 2 hours, or 1 hour when the temperature is above 90°F (32°C).
So:
Whole raw potato: different storage considerations.
Cooked potato: refrigerate promptly.
That's a distinction worth remembering.
What About a Potato That's a Little Wrinkly?
A little wrinkling usually means the potato has lost moisture.
It's a quality issue rather than an automatic indication that the potato has become dangerous.
But inspect it carefully.
If it's merely somewhat wrinkled and still firm, without mold, extensive greening, wet decay, or a rotten odor, it may still be usable.
If it's extremely shriveled, soft, leaking, moldy, or otherwise deteriorating, toss it.
Think of it this way:
A little age isn't the same thing as rot.
Can You Eat Potatoes With Small Sprouts?
Small sprouts can occur during storage, particularly as potatoes age.
Remove the sprouts and inspect the potato carefully before using it. Extension guidance specifically recommends removing sprouts before preparing potatoes.
If the potato is heavily sprouted, green, soft, or deteriorated, however, it's better to discard it.
And never eat the sprouts themselves.
What If the Potato Is Green Inside?
Green discoloration deserves caution.
The green color itself is associated with exposure to light, and heavily green potatoes can contain elevated levels of naturally occurring glycoalkaloids.
If only a small green area is present, remove the green portion generously before cooking.
If a potato has extensive green areas, discard it.
And don't assume cooking will make a heavily green potato safe.
Can You Wash Potatoes Before Storing Them?
It's generally better not to wash potatoes before storing them.
Washing adds moisture, and moisture isn't helpful for long-term storage.
Instead, keep them dry during storage and wash them when you're ready to prepare them.
If there's loose dirt on the skin, gently brushing it away is preferable to soaking the potatoes before putting them away. University of Minnesota Extension specifically advises brushing dried soil from stored potatoes rather than washing them.
How to Make Your Potatoes Last Longer
If you regularly buy potatoes in larger bags, a few simple habits can make a noticeable difference.
Buy only what you can store properly
If you don't have a cool storage area, buying smaller quantities may make more sense.
Inspect the bag when you bring it home
One soft or damaged potato can deteriorate faster than the others.
Remove damaged potatoes and use them promptly rather than storing them with the rest.
Keep potatoes away from sunlight
Darkness is your friend.
Keep them away from heat
Don't store potatoes directly beside the oven, stove, radiator, or another heat source.
Don't seal them in plastic
Give them some airflow.
Check them periodically
Don't forget about the bag for months.
A quick inspection every so often can help you catch soft, moldy, or deteriorating potatoes before the problem spreads.
So, How Long Can Potatoes Stay on the Counter?
Here's the simplest answer:
There isn't a hard seven-day expiration date for whole raw potatoes stored at room temperature.
A week on the counter does not automatically make them unsafe.
What matters is the condition of the potatoes and the storage environment.
For best quality, potatoes should be kept cool, dark, dry, and well ventilated. Under suitable storage conditions, potatoes can last considerably longer than a week. University of Minnesota Extension notes that properly stored potatoes can have a potential storage life measured in months, although actual home storage life varies with variety and conditions.
So if Grandma's potatoes have been sitting out for a week, don't panic.
Inspect them instead of judging them by the calendar.
Quick Potato Safety Checklist
Before cooking your week-old potatoes, ask:
Are they firm?
Good sign.
Do they smell normal?
Good sign.
Are they free of mold and wet rot?
Good sign.
Are they mostly their normal color rather than extensively green?
Good sign.
Are they only slightly wrinkled or beginning to sprout?
Inspect carefully and remove sprouts before preparation.
Are they very soft, moldy, rotten-smelling, leaking, or extensively green?
It's time to throw them out.
Frequently Asked Questions
Is it safe to eat potatoes that have been sitting out for a week?
Whole raw potatoes don't automatically become unsafe after one week at room temperature. If they've been stored in a suitable cool, dark, dry environment and remain firm and free from significant spoilage or extensive greening, they may still be perfectly usable.
Should potatoes be stored in the refrigerator?
Whole raw potatoes don't necessarily need refrigeration. Very cold storage can also cause cold-induced sweetening, which can affect potatoes intended for frying.
How can I tell if a potato has gone bad?
Look for significant softness, wet or slimy decay, mold, a strong rotten odor, extensive greening, or severe deterioration.
Are sprouted potatoes safe?
Sprouting is a natural part of potato aging. Remove sprouts and inspect the potato carefully. If it is also green, very soft, moldy, or rotten, discard it. Extension guidance recommends removing sprouts before preparation.
What should I do with green potatoes?
Remove small green areas before cooking. Potatoes with extensive green areas should be discarded.
Can I store potatoes in a plastic bag?
It's better to avoid trapping them in a tightly sealed plastic bag. Potatoes benefit from ventilation and a dry storage environment.
Can cooked potatoes sit on the counter overnight?
That's different from storing whole raw potatoes. Cooked potatoes are perishable and should be refrigerated promptly. USDA guidance recommends refrigerating cooked potatoes and other cooked vegetables and keeping them for about 3–4 days.
Do potatoes need to be washed before storage?
No. It's generally better to keep stored potatoes dry and wash them shortly before preparing them.
The Bottom Line
So, Grandma wasn't necessarily doing anything wrong.
In fact, storing whole raw potatoes outside the refrigerator can be perfectly reasonable when they're kept in the right conditions.
The important thing isn't whether exactly seven days have passed.
It's how the potatoes have been stored and what condition they're in now.
Keep them cool, dark, dry, and ventilated. Protect them from sunlight and heat. Check them periodically for soft spots, mold, rot, extensive greening, and other signs of deterioration.
And remember that raw potatoes and cooked potatoes are two very different storage situations.
So the next time you see a bag of potatoes sitting quietly on the counter, you don't necessarily need to reach for the trash can.
Take a closer look first.
Your grandma may have known a thing or two about keeping potatoes after all.
