Do Sweet Potatoes Go Bad? Shelf Life, Signs and Storage

Yes, sweet potatoes go bad, but they keep for weeks if you store them right. Raw ones last a few weeks in a cool, dark pantry, and the fridge can hurt them. Cooked ones are a perishable leftover. Below: how long each lasts, how to spot a bad one, and what to do with leftovers.

Do sweet potatoes go bad?

For a complete pantry storage reference, see our Food Storage Guide. For the fridge question, see our guide on whether sweet potatoes need to be refrigerated.

How Long Do Sweet Potatoes Last?

Sources give different windows, so here is each one. These are agency and trade figures, not guarantees.

How Long Do Raw Sweet Potatoes Last at Home?

University of Missouri Extension’s sweet potato handout says to store sweet potatoes in a cool, dark, dry place for use within two to three weeks, or at room temperature for up to a week. Utah State University Extension’s sweet potato guide says they last up to 3 to 4 weeks in a dry, dark, cool 55°F place, and to plan on using them within a week of purchase.

Purdue Extension’s FoodLink sweet potato sheet says 3 to 5 weeks in a cool, dark location. Oregon State University Extension’s Food Hero sweet potato newsletter says to use them within 2 weeks for best quality. the North Carolina SweetPotato Commission’s how-to page says up to two weeks if stored properly.

The sources differ, so we’d plan on 2 to 3 weeks in a cool, dark spot, which is Missouri’s range and a conservative middle of the home figures. On the counter, we’d plan on about a week. For regular potatoes, see our guide on whether potatoes go bad.

Why Do Some Sources Say 3 to 6 Months?

Penn State Extension’s sweetpotato curing and storage page gives 3 to 6 months for long-term storage. Iowa State University Extension’s sweet potato storage answer says 4 to 6 months for properly harvested and stored roots. Both name 55 to 60°F and 85 to 90 percent humidity. Penn State’s figure also assumes roots cured for 4 to 7 days at 80 to 85°F first.

the NC SweetPotato Commission says post-harvest curing helps extend their life for more than a full year. We can’t tell how the roots you bought were handled, and a home pantry rarely matches these conditions. So use the shorter home figures above.

These are storage-room conditions, and the 85 to 90 percent humidity is not a home target. For a typical home, choose the coolest practical dark spot with good airflow, and avoid sealed containers or damp areas.

Where Should You Store Sweet Potatoes?

Keep them somewhere cool, dark, dry and ventilated. the NC SweetPotato Commission suggests a cool, dry, well ventilated container, away from strong heat sources. Penn State says surface mold comes from high humidity plus poor airflow, and shriveling from humidity that is too low or airflow that is too strong.

Penn State’s storage target is 55 to 60°F. NC State Extension’s Harvesting and Curing Sweet Potatoes article gives 55 to 65°F after curing. Oregon State Extension says to use an open container or bag that allows air flow, and to scrub them under cool running water just before using. Those temperatures are storage-room targets, and a warmer kitchen shortens the window, as Missouri’s room temperature figure shows. For the full where-to-store answer, see our guide on whether sweet potatoes need to be refrigerated.

Can You Put Sweet Potatoes in the Fridge?

No, not raw. Utah State Extension says refrigeration makes the core harden and the vegetable bitter. NC State Extension’s All About Sweetpotatoes article says it causes poor taste and a hard center. Oregon State Extension says it can cause a hard center and an unpleasant taste.

LSU AgCenter’s article on curing and storing sweet potatoes says several days at low storage temperatures cause a hard center and lower the eating quality. Penn State ties this to chilling injury below 50 to 55°F. Cooked sweet potatoes and cut pieces are different, and they do belong in the fridge. See our guide on whether sweet potatoes need to be refrigerated.

How Can You Tell if a Sweet Potato Has Gone Bad?

Penn State says to discard roots with severe mold, rot or off odors. Purdue Extension says to avoid roots with holes, and Utah State says bruised ones deteriorate rapidly.

FDA’s “Are You Storing Food Safely?” page says mold is a sign of spoilage and that the safest practice is to discard moldy food. FDA also says food can make you sick even when it looks and smells fine.

We’d discard soft, mushy or leaking roots too. That is our own caution, not an agency list. We don’t suggest tasting to test.

Shriveling alone is a different matter. Penn State links it to humidity that is too low or airflow that is too strong, and it doesn’t list shriveling with the discard signs. Look for soft, deteriorating tissue as well as wrinkles.

What Are the Black Spots on a Sweet Potato?

NC State Extension’s January 2021 news item on sweetpotato black rot describes sweet potato black rot as firm, circular lesions ranging from grey to greenish black. NC State Extension’s black rot of sweetpotato factsheet calls the rot dry, firm and dark-colored, and says lesions can expand in diameter during storage.

Neither page says whether an affected root is safe to eat or whether cutting out the spot is enough, so we won’t claim either. We’d discard a root with dark lesions that are spreading. We found no source on other dark spots, such as bruises.

What Is the White Ooze on a Sweet Potato?

the UC Davis Postharvest Research and Extension Center’s Q&A on white ooze from cut sweet potatoes answered a food processor who asked about white liquid oozing from diced sweet potatoes. The expert said she thinks it is sap or latex. She did not call it safe, and she suggested lab testing for a commercial processor worried about spoilage.

So we can’t call it harmless on authority. For a home cook, the signs that matter are the ones above: severe mold, rot or an off odor. If a root oozes but is firm and has none of those, we’d use it soon. That is our own judgment.

Can You Eat a Sprouted Sweet Potato?

We found no university guidance on sprouted sweet potatoes. If a root has small sprouts but is still firm, with no rot, mold or off odor, we’d trim the sprouts and use it soon.

If it is soft, moldy or rotting, or it smells off, we’d discard it. That is our own judgment. Sprouting is also a sign the root has sat a while, so use the oldest first.

What If a Sweet Potato Has a Hard Center?

A hard center after storage points to cold. Penn State lists a hard center after cooking as a chilling injury symptom and recommends using affected roots soon. Other Extension sources describe a hard core, poor taste or bitterness.

The sources we read describe texture and flavor, not illness. They don’t say every refrigerated root is fine, so inspect it for mold, rot or an off odor. If you refrigerated sweet potatoes by mistake, cook them soon. The hard center can persist after cooking, though not every refrigerated root will develop one.

What About Cut or Peeled Sweet Potatoes?

FDA’s Tips to Reduce Food Waste fact sheet says to refrigerate peeled or cut veggies for freshness and to keep them from going bad. USDA’s Farmers Market Food Safety Tips says to refrigerate cut or peeled fruits and vegetables within two hours, or one hour when it is 90°F or warmer.

Neither source is specific to sweet potatoes, and we found no sweet-potato-specific shelf life for cut pieces. For the full answer, see our guide on whether sweet potatoes need to be refrigerated.

How Long Do Cooked Sweet Potatoes Last?

Cooked sweet potatoes are a perishable leftover. USDA’s leftovers guidance says leftovers can be kept in the refrigerator for 3 to 4 days. It says to refrigerate them within 2 hours, or within 1 hour if the temperature is over 90°F, and to use shallow containers.

Oregon State Extension gives sweet potatoes a longer window: 4 to 5 days in a covered container. We use USDA’s 3 to 4 days because it is the federal figure for leftovers and the shorter window leaves a margin.

USDA says to reheat leftovers to 165°F, measured with a food thermometer. For leftovers in general, see our guide on how long leftovers last.

Can You Freeze Sweet Potatoes?

Yes, freeze them cooked. South Dakota State University Extension’s sweet potato Preserve It sheet says to cook the potatoes until almost tender, peel and cool them, and pack them in containers or bags, leaving half an inch of headspace. For mashed, it says to mix 2 tablespoons of orange or lemon juice into each quart to prevent darkening.

Oregon State Extension says cooked sweet potatoes can be frozen whole, sliced or mashed, in an airtight bag or container, and used within 10 to 12 months. USDA’s leftover guidance gives 3 to 4 months, and says frozen leftovers are safe indefinitely but can lose moisture and flavor. Both figures are quality guidelines, not safety deadlines. We found no source on freezing raw sweet potatoes. For foods that don’t freeze well, see foods you should never freeze.

Can Sweet Potatoes Sit Out?

Cooked sweet potatoes shouldn’t sit out. FDA says not to let foods that require refrigeration sit at room temperature for more than two hours, or one hour above 90°F. A baked sweet potato on the counter, a casserole on the table and a pot of mash all count.

We’d discard cooked sweet potatoes that sat out past those limits. Raw ones are different, and they’re meant to sit in a cool pantry or on the counter.

Is a Yam the Same as a Sweet Potato?

NC State Extension says a yam is not a sweetpotato. It describes yams as starchy and cream-colored. The NC SweetPotato Commission says the “yams” in most US produce sections are nearly always sweet potatoes.

So if your store labels them yams, treat them like sweet potatoes. We found no storage source for true yams.

Can Old Sweet Potatoes Make You Sick?

FDA says food can make you very sick even when it doesn’t look, smell or taste spoiled. That applies most to cooked sweet potatoes left out or kept past their days.

We found no source tying a particular symptom to old sweet potatoes, so we won’t list any. Discard roots with severe mold, rot or an off odor, and cooked sweet potatoes past 3 to 4 days.

What Can You Make With Sweet Potatoes?

Planning a menu around sweet potatoes? Our bourbon baked ham and wine-glazed ham are easy mains to serve alongside, and roasted Brussels sprouts with balsamic and bacon makes a side. For dessert, see our maple pumpkin pie and maple pecan pie bars.

Cooking with canned pumpkin too? See whether canned pumpkin goes bad. For a fall breakfast, try our pumpkin pecan muffins. For a cranberry side, see our fresh cranberry sauce with orange and cinnamon.

What Else Should You Check in Your Pantry?

For other storage questions, see whether potatoes go bad and whether potatoes need to be refrigerated. For onions and garlic, see whether onions go bad and whether garlic goes bad. For tomatoes, see whether tomatoes need to be refrigerated.

Making mash? See whether instant mashed potatoes go bad, and don’t toss the cooking liquid before you read about potato water uses. For pumpkin pie, see whether pumpkin pie goes bad and whether pumpkin pie needs to be refrigerated. For maple syrup on top, see whether maple syrup goes bad.

Normal Things That Aren’t a Problem

See also

Food Storage

Does Gravy Need to Be Refrigerated? Jar, Packet and Homemade

• Skin and flesh color that varies. NC State Extension says sweet potatoes come in many colors.
• A raw root sitting in a cool pantry or on the counter. Missouri Extension allows room temperature storage for up to a week.
• Cooked sweet potatoes refrigerated within 2 hours and eaten on day 2 or 3. That is inside USDA’s 3 to 4 days.

None overrides the signs above.

Do Sweet Potatoes Go Bad FAQ

Further Reading

• Do Sweet Potatoes Need to Be Refrigerated?
• Food Storage Guide