If your grandma has always kept a bag of potatoes sitting on the kitchen counter, in a pantry, or in a cupboard instead of putting them in the refrigerator, you may have wondered whether she is taking a food-safety risk.
And if you have ever looked at those potatoes after a week and thought, “Are these still safe to eat?”, you are definitely not alone.
The good news is that whole, raw potatoes do not normally need to be refrigerated. In fact, potatoes are generally better stored in a cool, dark, dry place rather than in the refrigerator. The USDA specifically recommends storing potatoes in dry storage at approximately 60–70°F (16–21°C).
So your grandma’s method isn’t necessarily wrong.
However, there is an important distinction between “stored for a week” and “stored properly for a week.” A potato sitting in a cool, dry pantry is very different from one sitting beside a hot stove in a warm, humid kitchen.
The question isn’t simply, “Has it been out for seven days?”
Instead, you should ask:
Where was it stored, what condition is it in now, and does it show signs of spoilage or excessive sprouting?
Let’s take a closer look.
How Long Can Raw Potatoes Stay Out?
For whole, raw potatoes, one week at room temperature is generally not a reason to throw them away, provided they have been stored properly and remain in good condition.
Unlike cooked potatoes, whole raw potatoes are not treated like refrigerated leftovers. They are a storage crop designed to remain usable for extended periods.
USDA guidance recommends keeping potatoes in a dry-storage environment around 60–70°F (16–21°C) rather than refrigerating them.
That means your grandma’s countertop habit may be perfectly reasonable if her kitchen is relatively cool and the potatoes are protected from moisture and sunlight.
But a kitchen counter isn’t always the ideal location.
If the potatoes are exposed to:
- Direct sunlight
- High temperatures
- Steam
- Excess humidity
- Water
- Heat from an oven or stove
- Poor air circulation
they may deteriorate much faster.
So there isn’t one magic number of days that applies to every potato in every kitchen.
A potato stored properly may remain usable for considerably longer than a potato stored in a hot, humid environment.
Does a Potato Become Unsafe After Seven Days?
No.
Seven days by itself does not make a raw potato unsafe.
This is an important point because many people associate “one week” with the refrigerator rules they know for leftovers.
Cooked potatoes are different. USDA guidance says cooked potatoes and other cooked vegetables can generally be kept in the refrigerator for 3–4 days.
That rule does not mean an uncooked potato sitting in a pantry has the same four-day limit.
Whole raw potatoes are much more stable than cooked potatoes.
Instead of relying solely on the number of days, inspect the potatoes before using them.
A potato that has been sitting on the counter for seven days but is:
- Firm
- Dry
- Free of mold
- Free of significant decay
- Not badly shriveled
- Not strongly green
- Not excessively sprouted
may still be perfectly suitable for cooking.
On the other hand, a potato that has been sitting there for only a few days but is soft, leaking, moldy, or badly decomposed should not be eaten.
Condition matters more than the calendar.
Why Potatoes Should Usually Stay Out of the Refrigerator
It may seem strange that potatoes shouldn’t automatically go into the refrigerator.
After all, refrigeration slows deterioration in many foods.
But potatoes are different.
USDA produce-storage guidance specifically places potatoes among foods that should be stored in dry storage rather than refrigerated, with an ideal range around 60–70°F.
For home storage, a pantry, cupboard, basement, or other cool, dark location is generally a better choice than the refrigerator.
The refrigerator is also not necessary simply because you bought potatoes a week ago.
Instead, focus on finding a storage location that is:
Cool + dark + dry + well ventilated.
That’s much more useful than simply remembering “potatoes belong in the fridge” or “potatoes belong on the counter.”
What Happens If Potatoes Get Too Warm?
Heat can accelerate deterioration.
Potatoes are living plant tissues, so they continue undergoing natural processes after harvest. Under unfavorable storage conditions, they can lose moisture, shrink, sprout, or develop other quality problems.
USDA agricultural research notes that potato storage can be affected by problems including early sprouting and diseases, and that maintaining proper storage conditions is important for preserving potato quality.
This is why a bag of potatoes sitting in a cool pantry may last much better than the same bag sitting in a warm kitchen.
If your kitchen becomes very hot during the summer, particularly if the potatoes are near a cooking appliance, consider moving them somewhere cooler and darker.
The Biggest Problem With Leaving Potatoes on the Counter: Light
If your grandma keeps potatoes on the counter, one thing I would pay particular attention to is light.
Potatoes are best protected from light.
A potato exposed to light can develop green coloration. Green areas are associated with increased levels of naturally occurring glycoalkaloids, including compounds such as solanine.
The FDA notes that potatoes are among foods in which solanine is considered in food-safety evaluation.
That doesn’t mean every potato with a tiny green patch is automatically dangerous.
But significant greening is a reason to be cautious.
Instead of leaving potatoes in direct sunlight on an open counter, put them in a dark pantry, cupboard, or other suitable storage area.
A breathable bag or container that protects them from light while allowing air circulation is preferable to sealing damp potatoes in an airtight plastic bag.
What About Sprouted Potatoes?
Sprouting is another common reason people become nervous about older potatoes.
You may open the cupboard after a couple of weeks and discover little white, pink, or green shoots growing from the potatoes.
Does that automatically mean you need to throw the entire bag away?
Not necessarily.
Potatoes naturally sprout as they age, and USDA research recognizes sprouting as a normal storage issue that affects potato quality.
A potato with a small amount of sprouting may still be usable if the potato itself remains firm and otherwise appears healthy.
You can remove small sprouts and inspect the potato carefully before cooking.
However, don’t try to rescue potatoes that are also:
- Very soft
- Severely shriveled
- Moldy
- Rotten
- Strongly green
- Leaking
- Bad-smelling
- Covered with extensive growth
When multiple signs of deterioration appear together, throwing the potato away is the safer choice.
What If the Potato Is Green?
This is where I would be more cautious.
A little green discoloration should not be treated casually, particularly if large portions of the potato have turned green.
Green coloration itself is caused by chlorophyll and isn’t the toxic substance. However, greening can occur alongside increased levels of naturally occurring glycoalkaloids.
If you notice a small green area, you can cut away the affected portion generously and examine the rest of the potato.
But if a potato is heavily green, bitter, badly sprouted, or otherwise deteriorated, it is better to discard it rather than trying to salvage it.
And don’t rely on cooking alone to make a severely problematic potato safe.
When in doubt, throw it out.
What If the Potato Is Soft?
A potato becoming slightly less firm over time doesn’t automatically mean it has become dangerous.
Potatoes lose moisture during storage, so older potatoes can become somewhat wrinkled or softer.
The important question is how soft?
A slightly shriveled potato may still be usable, particularly if there is no mold, rot, leaking, or unpleasant odor.
But a potato that feels:
- Mushy
- Wet
- Slimy
- Collapsing
- Rotten
should be discarded.
Texture is one of the most useful signs when evaluating older potatoes.
A firm potato with a few small sprouts is a very different situation from a potato that practically falls apart when you pick it up.
Moldy Potatoes: Throw Them Away
Mold is a different matter.
If a potato has visible mold, extensive decay, or obvious rot, don’t try to save it simply because you bought it recently.
Mold and decay can indicate that the potato has deteriorated substantially.
The FDA emphasizes that fresh produce can become contaminated during growing, harvesting, storage, and preparation, which is why proper storage and inspection matter.
If one potato in a bag has become rotten, inspect the potatoes around it carefully. Remove the affected potato and check the others for moisture, soft spots, mold, or other signs of deterioration.
Should You Wash Potatoes Before Storing Them?
Generally, it’s better not to wash whole potatoes before storing them for an extended period.
Washing adds moisture, and moisture is not your friend when you’re trying to store potatoes.
Instead, keep them dry and wash them when you’re ready to prepare them.
When you do wash potatoes for cooking, rinse them under running water and scrub away visible dirt.
The FDA recommends washing fresh produce under running water and taking steps to prevent cross-contamination during food preparation.
If you’ve already washed potatoes, allow them to dry thoroughly before storing them, but ideally, don’t wash them until you need them.
What Is the Best Place to Store Potatoes?
If you want to improve your grandma’s traditional method without completely changing it, move the potatoes from the open countertop to a better storage location.
The ideal spot should be:
Cool
A cool environment helps slow deterioration.
Dark
Keep potatoes away from sunlight and bright kitchen lighting.
Dry
Avoid locations where potatoes can become damp or wet.
Well Ventilated
Potatoes benefit from airflow. Avoid trapping them in a sealed container where moisture can accumulate.
Away From Heat
Don’t store potatoes beside an oven, stove, radiator, or other heat source.
A pantry or dark cupboard can work well.
If your home has a cool, dry basement or similar storage space, that may also be suitable.
The USDA’s produce-storage guidance gives 60–70°F (16–21°C) as the dry-storage range for potatoes.
Should Potatoes Be Stored in a Plastic Bag?
If your potatoes came in a plastic bag with little or no ventilation, transferring them to a breathable storage bag or basket can be helpful.
The goal is to avoid trapping moisture.
A paper bag, mesh bag, basket, or another container that allows reasonable airflow can work.
Don’t pack potatoes tightly into a container and forget about them.
Check them periodically.
One bad potato can deteriorate and potentially affect the surrounding potatoes through moisture and decay.
What About Storing Potatoes Next to Onions?
This is another common kitchen-storage question.
Many people keep potatoes and onions together because both are commonly stored outside the refrigerator.
However, they are generally better stored separately.
Both potatoes and onions release moisture and gases during storage, and keeping them separated can help reduce premature deterioration.
Give each food its own breathable storage area.
You don’t need a complicated storage system.
Two baskets or two breathable bags in a cool, dark pantry are enough.
What If Your Kitchen Is Very Hot?
This is particularly important during summer.
If your kitchen regularly becomes very warm, the countertop may not be the best place for potatoes.
Instead, look for the coolest suitable location in your home.
A dark cupboard away from appliances may be considerably better than an exposed countertop.
Remember that “room temperature” isn’t always the same in every home.
A kitchen at 18°C is very different from a kitchen that regularly reaches 30°C or more.
If your home is hot, inspect potatoes more frequently for sprouting, shrinking, soft spots, and spoilage.
What About Potatoes That Have Been Sitting Out for a Week?
Now let’s return to the original concern.
You look at the potatoes and realize they’ve been sitting on the counter for seven days.
Should you throw them away?
Not necessarily.
If they are whole, raw potatoes and have been kept in reasonable conditions, seven days is not automatically unsafe.
Look at each potato.
If it is:
- Firm
- Dry
- Normal-looking
- Free from mold
- Free from rot
- Not significantly green
- Not excessively sprouted
then it may still be perfectly fine to prepare.
On the other hand, if you find a potato that is moldy, rotten, leaking, extremely soft, strongly green, or otherwise badly deteriorated, discard it.
The key lesson is that raw potatoes don’t have a simple seven-day expiration rule when stored outside the refrigerator.
Raw Potatoes and Cooked Potatoes Are Completely Different
One of the easiest mistakes to make is confusing the storage rules for raw and cooked potatoes.
A whole raw potato can be stored in a pantry.
A baked potato, mashed potato, boiled potato, or cooked potato dish is different.
Once potatoes are cooked, they should be treated as a perishable food.
USDA guidance recommends refrigerating cooked potatoes and other cooked vegetables and using them within 3–4 days.
Cooked potatoes should not simply sit on the counter overnight.
USDA guidance states that perishable food should not remain in the food-safety “danger zone” for more than two hours, or one hour when temperatures are above 90°F (32°C).
So your grandma can keep raw potatoes in a suitable pantry.
But leftover mashed potatoes from dinner belong in the refrigerator.
A Simple Potato Safety Checklist
Before cooking an older potato, take a few seconds to inspect it.
1. Feel it
Is it reasonably firm?
If it is extremely soft or mushy, discard it.
2. Look at the skin
Is there extensive mold, rot, or unusual discoloration?
If yes, discard it.
3. Check for green areas
Small areas can be cut away generously, but heavily green potatoes are best discarded.
4. Look for sprouts
A few small sprouts don’t necessarily mean the potato is unusable. Remove them and inspect the potato.
5. Smell it
Does it smell fresh and earthy, or does it smell rotten or unpleasant?
A bad odor is a warning sign.
6. Check for moisture
Wet, leaking, or slimy potatoes should be discarded.
This quick inspection is much more useful than automatically throwing away every potato that has been sitting in the pantry for a week.
Tips for Making Your Potatoes Last Longer
If you regularly buy potatoes in large quantities, a few simple habits can make a big difference.
Store them in darkness. Light encourages unwanted changes, including greening.
Keep them dry. Don’t wash potatoes until you’re ready to use them.
Give them ventilation. Avoid tightly sealed plastic containers.
Keep them away from heat. A cool pantry is better than a warm countertop.
Check them regularly. Don’t wait until the entire bag has deteriorated.
Remove damaged potatoes. If one potato is rotting, remove it promptly.
Don’t automatically refrigerate them. USDA guidance recommends dry storage around 60–70°F rather than refrigeration for potatoes.
Separate potatoes from onions. Keeping them in different containers can help reduce storage problems.
Frequently Asked Questions
Can I eat potatoes that have been on the counter for a week?
Usually, yes, if they are whole raw potatoes that have been stored under reasonable conditions and remain firm and free from significant spoilage. Seven days alone does not make a potato unsafe.
How long do potatoes last at room temperature?
There isn’t one universal number because storage temperature, humidity, light, potato variety, and initial condition all matter. Properly stored potatoes can remain usable for much longer than a week, while potatoes exposed to heat and moisture may deteriorate much faster.
Should raw potatoes be refrigerated?
Generally, no. USDA guidance recommends storing potatoes in dry storage around 60–70°F (16–21°C).
Can I eat potatoes with sprouts?
Small sprouts do not automatically mean the entire potato must be discarded. Remove the sprouts and inspect the potato carefully. If it is heavily sprouted, green, soft, moldy, or otherwise deteriorated, discard it.
Can I eat a potato that is slightly green?
Be cautious. Green coloration can be associated with increased glycoalkaloid levels. If greening is extensive, the potato is bitter, or it has other signs of deterioration, discard it.
What if my potato is wrinkled?
A mildly wrinkled potato may simply have lost moisture during storage. If it remains otherwise healthy and firm enough to use, it may still be suitable for cooking. A very soft, mushy, moldy, or rotten potato should be discarded.
Should I wash potatoes before storing them?
It’s generally better to keep stored potatoes dry and wash them shortly before preparation.
Can cooked potatoes stay on the counter?
Cooked potatoes should be handled as perishable food. Refrigerate them promptly and generally use them within 3–4 days.
The Bottom Line
So, was your grandma wrong for keeping potatoes on the counter?
Not necessarily.
In fact, keeping whole raw potatoes out of the refrigerator is generally consistent with USDA storage guidance. Potatoes are best kept in a cool, dark, dry, well-ventilated location, with USDA recommending dry storage around 60–70°F (16–21°C).
If your grandma’s potatoes have been sitting out for a week, you don’t need to throw them away simply because seven days have passed.
Instead, inspect them.
A potato that is still firm, dry, and free from significant mold, rot, greening, or excessive sprouting can often still be used.
The bigger concern isn’t the number seven.
It’s storage conditions and the potato’s condition.
If the potatoes have been sitting in a cool, dark pantry, your grandma may have been using a perfectly sensible traditional storage method all along.
If they’ve been sitting in a hot kitchen, in direct sunlight, or in a damp plastic bag, that’s a different story.
And remember the most important distinction of all:
Whole raw potatoes can be stored in a suitable pantry. Cooked potatoes need refrigeration.
So the next time you discover a week-old potato sitting on the counter, don’t panic. Give it a good inspection, use your judgment, and pay attention to what the potato is telling you.
Sometimes Grandma really does know best—but a cool, dark pantry is even better than a sunny countertop.