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How long does canned food last? According to the USDA, high-acid canned foods like tomatoes and fruit keep their best quality for 12 to 18 months, while low-acid canned foods like meats and vegetables keep for 2 to 5 years. But that’s only half the answer. The date on the can is about quality, not safety, and the condition of the can and where you store it matter just as much.
Here’s what the USDA, CDC and FEMA actually say, how to spot a can you should throw out, and how canned food compares to long-shelf-life emergency food.
How long does canned food last? The USDA numbers
The USDA’s Food Safety and Inspection Service (FSIS) splits commercially canned food into two groups:
| Type | Examples | Best quality for |
|---|---|---|
| High-acid canned foods | Tomatoes, fruits | 12 to 18 months |
| Low-acid canned foods | Meats, vegetables | 2 to 5 years |
Why the difference? FSIS explains that natural chemicals in food keep reacting with the can over time, especially in high-acid foods like canned tomatoes. Over several years this can cause taste and texture changes and eventually lower the food’s nutritional value.
Is canned food safe after the date?
Usually, yes, if the can is in good shape and has been stored properly. FSIS says that, except for infant formula, dates on food are not an indicator of safety. They tell you when the product will be at its best quality. If the date passes during home storage, FSIS says a product should still be safe and wholesome if handled properly until spoilage is evident.
That doesn’t mean canned food lasts forever. FSIS lists the factors that limit shelf life: rust, dents from shipping or dropping, can corrosion, and heat.
Reading the codes on a can
Many cans carry a “closed” or coded date: a string of letters and numbers the manufacturer uses to show when the food was canned. Some also show a calendar “Best if Used By” date. Neither one is a safety cutoff. When in doubt, write your purchase date on the lid with a marker so you know how long it has been in your pantry.
Storage: the biggest factor you control
How long does canned food last in your own pantry? That depends heavily on where you keep it. FSIS says high temperatures (over 100°F) are harmful to canned goods and that the risk of spoilage jumps sharply as storage temperatures rise.
- Keep it cool: FSIS says temperatures below 85°F are best.
- Keep it dry: moisture leads to rust.
- Avoid the bad spots: never above or beside the stove, under the sink, in a damp garage or basement, or anywhere with temperature extremes.
- Rotate: FSIS suggests checking your pantry every few weeks and using canned goods you’ve had on hand for a while.
One more catch: not every can belongs in the pantry. FSIS notes that some canned foods, such as some canned hams and seafood, aren’t safe at room temperature. If the label says “Keep Refrigerated,” keep it refrigerated.
When to throw a can out
How long does canned food last once the can is damaged? Possibly not at all. The can itself tells you a lot. Here’s the official guidance, condition by condition.
Dented cans
FSIS says a can with a small dent that’s otherwise in good shape should be safe to eat. Discard deeply dented cans. A deep dent is one you can lay your finger into, and deep dents often have sharp points. Throw out any can with a deep dent on a seam, since a sharp dent on the top or side seam can let bacteria in.
Rusted cans
Surface rust you can wipe off with a finger or paper towel isn’t serious, according to FSIS. Heavily rusted cans can have tiny holes that let bacteria in, so discard them. If you open a can and see rust inside, don’t eat the food.
Bulging, swollen or leaking cans
Don’t use them. FSIS says cans can swell because of contamination with Clostridium botulinum, the bacteria behind botulism, or other spoilage organisms. FEMA’s Ready.gov adds: don’t eat food from cans that are swollen, dented or corroded, even if the food looks fine, and don’t eat any food that looks or smells abnormal, even if the can looks normal.
The CDC warns that you can’t see, smell or taste the toxin that causes botulism. Its rule is simple: if in doubt, throw it out.
Cans that froze
Cans left in a freezing car or garage can swell as the food expands. FSIS says to discard any swollen can, and to discard frozen cans that have thawed at 40°F or higher. A frozen can that hasn’t thawed can be defrosted in the refrigerator; if the food looks and smells normal, FSIS says to boil it thoroughly (10 minutes at altitudes below 1,000 feet, plus a minute per extra 1,000 feet; 20 minutes for spinach and corn) before eating.
What about home-canned food?
When people ask how long does canned food last, the figures above apply to commercially canned food. Home canning is riskier. FSIS explains that low-acid foods such as green beans, corn, beets and peas can carry botulism spores from the soil, and those spores take very high temperatures to destroy. That’s why low-acid foods must be canned in a pressure canner. The CDC adds: don’t eat food if you don’t know whether it was safely canned.
After you open a can
FSIS says you can refrigerate leftover canned food in the can, but for the best quality and flavor, move it to a glass or plastic storage container. Ready.gov notes that commercially canned food can be eaten straight from the can without warming, which is handy during a power outage.
How long does canned food last vs. emergency food?
Canned food is cheap, familiar and needs no water or cooking, which makes it a great base for any pantry. Its weak spots for long-term emergency storage are weight, bulk, rotation and that 12-month to 5-year quality window.
Freeze-dried and dehydrated emergency food is built for longer storage. My Patriot Supply lists a shelf life of up to 25 years when stored properly in a cool, dry place for its kits, packed in resealable multi-layer pouches with oxygen absorbers. The trade-off is that most meals need water and heat.
- The 1-Week Food Supply Ammo Can provides 14,860 calories (one person for a week) and needs about 2.96 gallons of water to prepare.
- The 4-Week Emergency Food Supply provides 56,460 calories in two stackable buckets and needs about 9.14 gallons of water.
- The 3-Month Emergency Food Supply provides 181,960 calories across 22 food and drink varieties and needs about 36.12 gallons of water.
The smart move for most families is both: canned goods you eat and rotate, plus a long-shelf-life layer you can mostly leave alone. For more on how long other emergency foods keep, see how long freeze-dried food lasts and freeze-dried vs. dehydrated food. Our prepper pantry essentials guide covers which cans are worth stocking, and our power outage emergency kit shows where canned food fits in an outage plan.
How much do you need? Use our free Emergency Food Calculator to see exactly how many calories and gallons of water your family needs, from 72 hours to a full year.
Frequently asked questions
How long does canned food last past the expiration date?
Canned food dates are usually quality dates, not safety dates. FSIS says products should still be safe after the date if handled properly, as long as there’s no sign of spoilage and the can is in good condition. Quality, such as taste and texture, slowly declines.
Which canned foods last the longest?
Low-acid canned foods like meats and vegetables. FSIS says they keep for 2 to 5 years, compared with 12 to 18 months for high-acid foods like tomatoes and fruit.
Is it safe to eat from a dented can?
A small dent on an otherwise sound can is fine, per FSIS. Throw out cans with deep dents you can lay a finger into, sharp dents, or any deep dent on a seam.
How long does canned food last in a hot garage?
Not as long. FSIS says temperatures over 100°F are harmful to canned goods and the risk of spoilage jumps as temperatures rise. Below 85°F is best.
The bottom line
So, how long does canned food last? Plan on 12 to 18 months for high-acid foods and 2 to 5 years for low-acid foods for best quality, and longer for safety if the can stays in good shape. Store it cool and dry, rotate it, and throw out anything bulging, leaking, deeply dented or heavily rusted. For storage measured in decades rather than years, pair your canned goods with long-shelf-life emergency food.
Sources: USDA FSIS: Shelf-Stable Food Safety, USDA FSIS: Food Product Dating, CDC: Preventing Botulism, Ready.gov: Food. Product details are from My Patriot Supply product pages as of October 27, 2026.