How long does emergency food last, and how do you rotate it?

Short answer. Commercially canned low-acid foods such as meat and vegetables keep their quality for two to five years, and high-acid cans such as tomatoes and fruit for up to 18 months ². FEMA and the Red Cross advise using dried fruit, crackers and boxed powdered milk within six months ¹. Store food cool, dry and dark, date every item, and eat the oldest first ¹².

How long does each type of emergency food last?

Shelf life depends on how acidic, dry and well sealed a food is. The figures below are guidelines for best quality, not an exact date when food becomes unsafe. They assume unopened packages stored in good conditions.

Sources sometimes disagree. FEMA's 2004 brochure says to use canned fruit and vegetables within a year or by the label date ¹. North Dakota State University Extension gives up to 18 months for high-acid cans and two to five years for low-acid cans ². Neither figure is wrong, because both describe quality. FEMA's one-year figure is simply the more cautious replacement schedule. FEMA's "indefinitely" also depends on the condition it states, proper containers and conditions ¹. It does not mean an open bag of rice in a warm cupboard will keep forever.

Does food become unsafe after the date on the package?

In most cases, a date on shelf-stable food is about quality, not safety. NDSU Extension says a "best if used by" date tells you how long a product keeps its best flavour or quality and "is not a safety date" ². The Canadian Food Inspection Agency says you can buy and eat foods after the best before date, though freshness, flavour and nutrition may have declined ⁴. Best before dates apply only to unopened products ⁴.

There are exceptions. In Canada, infant formula, meal replacements, nutritional supplements and formulated liquid diets carry an expiration date, and food past that date "should not be bought, sold or eaten" ⁴. If your household depends on formula or a medical diet, rotate it strictly by date.

The date also does not protect food that has been damaged. FEMA and the Red Cross say to throw out canned goods that become swollen, dented or corroded ¹. NDSU adds cans that are leaking or bulging, cans with sharp dents (especially on the seam), cracked jars, jars with loose or bulging lids, and any container that spurts liquid when opened ².

Where and how should emergency food be stored?

Utah State University Extension lists temperature, moisture, oxygen and light among the factors that shorten shelf life ³.

• Temperature. USU Extension recommends a constant temperature between 40 and 60 degrees (Fahrenheit, about 4 to 16 °C) and says to avoid freezing ³. Citing the USDA, it adds that every 10.8-degree rise in temperature cuts the shelf life of stored food in half ³. NDSU warns against storing food above the stove, under the sink or anywhere exposed to temperature extremes ².
• Dryness and darkness. FEMA and the Red Cross advise a dry, cool spot, dark if possible ¹. USU Extension notes that light degrades the food value of foods, and says foods for long-term storage should have 10% or less moisture content ³.
• Air and pests. Wrap crackers and cookies in plastic bags inside sealed containers. Move opened sugar, dried fruit and nuts into screw-top jars or airtight canisters to keep pests out ¹. USU recommends food-grade plastic, metal or glass containers, ideally with an airtight seal ³.
• One caution. USU Extension warns that botulism can result if moist products are stored in packaging that reduces oxygen ³. Food packed with oxygen absorbers must be dry, about 10% moisture or less ³.

How does first-in, first-out rotation work?

FEMA's advice is short: check expiration dates and "follow the practice of first-in, first-out" ¹. In practice:

1. Date everything. Write the purchase date on each package with ink or marker ¹².
2. New at the back, old at the front. Put new items behind older ones so you naturally reach for the oldest first ¹.
3. Eat from the stock. Germany's BBK recommends using stored products in everyday cooking, choosing first the food that expires first ⁶. FEMA notes that the canned goods and dry mixes already in your cupboard can form much of your emergency supply ¹.
4. Build it gradually. BBK suggests buying a little extra on each shopping trip until the supply reaches your target ⁶. Sweden's MCF suggests buying extra portions of items you already buy that have a long shelf life ⁸.
5. Review on a schedule. The Government of Canada says to replace food, water, batteries and medications that might expire at least once a year ⁵. FEMA says to review a disaster supplies kit at least once a year or when your family's needs change ¹.

Choose foods your household already eats. FEMA notes that familiar foods lift morale in stressful times ¹, and food that is eaten in normal weeks rotates itself.

What official agencies recommend

Agencies agree on rotation and storage but differ on how much to keep.

• United States (FEMA and American Red Cross): a three-day supply of nonperishable food and a manual can opener in the basic kit, and consider keeping a food supply that lasts two weeks ¹. Water: at least one gallon per person per day, ideally a two-week supply ¹.
• Canada: be ready to be self-sufficient for at least 72 hours, and replace expiring items at least once a year ⁵.
• Germany (BBK and BLE): ideally ten days of self-sufficiency, although even three days helps a lot ⁶. The BLE example supply provides about 2,200 kcal per person per day and leaves out frozen food, because a power cut can stop refrigeration ⁷. BBK puts drinking needs at a minimum of 1.5 litres per adult per day, plus 0.5 litres if you cook ⁶.
• Sweden (MCF): enough food for a week without having to shop. Choose filling, energy-rich foods that keep at room temperature, such as grains, pasta, tinned goods, dried or tinned protein, nuts and oils ⁸.

Water guidance is where the agencies differ most. The US figure of one gallon (about 3.8 litres) per person per day covers drinking, food preparation and hygiene ¹. Germany's 1.5 to 2 litres covers drinking and cooking only ⁶. Check your own country's list before you buy.

During an outage, eat perishable food from the refrigerator first, then food from the freezer, and only then the nonperishable stock ¹⁸. In a well-filled, well-insulated freezer, food usually still has ice crystals at the centre for at least two days ¹.

Frequently asked questions

Can I eat canned food after its best before date?

Usually yes, if the can is intact. Canadian and US guidance treats best before dates as quality dates, not safety dates ²⁴. Discard any can that is swollen, leaking, corroded or sharply dented, and any container that spurts liquid when opened ¹².

How often should I rotate my emergency food?

Canada says to replace expiring items at least once a year ⁵. FEMA lists foods to use within six months, such as crackers and dried fruit, and foods to use within one year, such as canned fruit and soups ¹. Eating the oldest item first in normal weeks keeps the whole stock within those windows ¹⁶.

Is the freezer part of an emergency food supply?

Only for short outages. FEMA and Sweden's MCF say to eat refrigerator food first and to open the freezer as few times as possible ¹⁸. Germany's BLE leaves frozen food out of its 10-day example because a power cut can stop refrigeration ⁷.

What temperature is best for storing food long term?

Utah State University Extension recommends a constant 40 to 60 degrees Fahrenheit (about 4 to 16 °C), with no freezing ³. Avoid spots near the stove, under the sink or anywhere with large temperature swings ².

Does home-canned food last as long as store-bought cans?

No. NDSU Extension gives one year from the date of canning for home-canned food ², compared with up to 18 months for high-acid and two to five years for low-acid commercial cans ².

Build a stock from your country's list

Official targets range from 72 hours in Canada to ten days in Germany ⁵⁶. Start from your own country's list, add to it gradually from the food your household already eats, and rotate it as described above. Build your Phaenyx plan.

Sources

1. Federal Emergency Management Agency and American Red Cross — Food and Water in an Emergency (FEMA 477 / A5055, August 2004) — https://www.fema.gov/pdf/library/f&web.pdf (accessed 2026-10-20)
2. North Dakota State University Extension — Questions and Answers About Storing Canned and Packaged Food (FN1468) — https://www.ndsu.edu/agriculture/sites/default/files/2024-03/FN1468.pdf (accessed 2026-10-20)
3. Utah State University Extension — 7 Factors That Prolong Your Food Storage Supply — https://extension.usu.edu/news_sections/home_family_and_food/foodstorage (accessed 2026-10-20)
4. Canadian Food Inspection Agency — Best before, expiration and more: Understanding the date labels on your food — https://inspection.canada.ca/en/food-labels/labelling/consumers/date-labels-food (accessed 2026-10-20)
5. Government of Canada — Emergency kits — https://www.canada.ca/en/services/policing/emergencies/preparedness/get-prepared/emergency-kits.html (accessed 2026-10-20)
6. Bundesamt für Bevölkerungsschutz und Katastrophenhilfe (BBK) — Essen und Trinken bevorraten — https://www.bbk.bund.de/DE/Warnung-Vorsorge/Vorsorge/So-koennen-Sie-sich-vorbereiten/Bevorraten/bevorraten_node.html (accessed 2026-10-20)
7. Bundesanstalt für Landwirtschaft und Ernährung (BLE) — Notvorrat — https://www.ernaehrungsvorsorge.de/private-vorsorge/notvorrat (accessed 2026-10-20)
8. Swedish Civil Defence and Resilience Agency (MCF) — Access to food during a crisis — https://www.mcf.se/en/advice-for-individuals/home-preparedness--prepping-for-at-least-a-week/food/access-to-food-during-a-crisis/ (accessed 2026-10-20)