BUCKHORN CLIFFSA preparedness field manual

Food · Supply

Cereal and Granola

How long boxed cereal and granola keep sealed and opened, why granola with nuts and oil goes rancid first, how to store them, how to tell they are stale or spoiled, and making granola that keeps.

6-12 MOSTALE IS SAFERANCID IS DONEWorks without power

Quick facts

  • Boxed cereal6 to 12 months sealed; 2 to 3 months opened
  • GranolaMonths; the nuts and oil turn first; freeze to extend
  • Best storage
    • Sealed bag inside the box
    • airtight once opened
    • cool
  • Watch for
    • Rancid smell
    • moisture
    • pests

Where this sits on the food shopping list

Cereal is breakfast with no cooking and no fridge, which is a real thing in the first days of an outage, and granola is the dense version with the calories to be a meal. Neither is a long-term food: a box of cereal is a year sealed and a few months opened, and granola, with its nuts and oil, is the first thing in the pantry to go rancid. The oats page is the long-term answer to the same breakfast.

Which to buy

Plain cereals without nuts or dried fruit keep longest; the sugared ones keep as well but bring less. Granola is best bought in small bags and often, or made in batches from the stored oats. For the bag: a sealed pouch of granola or cereal bars, replaced every spring. For the store: a few boxes of what the children eat, rotated through the kitchen, and the oats bucket behind them.

How long it really lasts

By how it is kept

FormLabel saysReal, stored well
Boxed cereal, sealed6 to 12 monthsAbout a year; stale rather than spoiled after
Boxed cereal, opened2 to 3 months in the folded bag, longer in an airtight jar
Granola, sealedMonths; nuts and oil set the clock
Granola, openedA few weeks at full quality; freeze for 3 to 6 months
Cereal and granola bars, sealed6 to 12 monthsAbout a year; the chocolate and nuts age first
The Preparedness Food Shopping List (PDF), a one page printable PDF

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Get the one-page food shopping list

What to store, how much of it for one person for one month, and how long it keeps. One page with checkboxes, built from the Survival Foods field guide. Print it, multiply by your people and months, and take it to the store.

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How to store it

Cool and dry, the inner bag folded tight or the cereal decanted into an airtight jar, because moisture is what makes cereal soft and stale. Granola goes into a jar in the fridge or the freezer once opened; the fat in it turns at room temperature in weeks in summer. Neither takes an oxygen absorber for the long term: the Mylar ranking puts granola on the list of foods too oily or too moist for one, and cereal would only go stale anyway.

How to tell it has turned

Stale is soft, chewy and flat-tasting, and it's safe; a few minutes on a sheet pan in a low oven crisps it back. Rancid is a smell, sharp, bitter, like old paint or crayons, in anything with nuts, seeds or oil, and it's done. Moisture inside the bag, clumping, or webbing and small moths mean the box goes and the shelf gets wiped.

Keep it

Stale cereal, granola that has lost its crunch, a box past its date that smells clean.

Discard on sight

A rancid or bitter smell, moisture inside the bag, mold, webbing or insects.

How much, and how to use it

A cup of cereal with powdered milk made up from the can is a 200 calorie breakfast that needs no heat. Granola is 500 calories a cup and travels; a bag in the truck and the bug-out bag is lunch. To make granola that keeps: rolled oats, a little oil and honey, baked low until dry, with the nuts and dried fruit added when it is served rather than baked in, and the batch stored in the freezer; it's cheaper than the box and the oats came from the bucket.

When the power goes out

No-cook breakfast for the first days: cereal and granola with powdered milk or canned milk, or eaten dry from the bag. Opened granola in a warm house should be eaten within the week.

Shelf-life figures are from the Survival Foods field guide; fridge, freezer and pantry times are from the USDA cold and pantry storage charts. Run the look, smell, taste check before eating anything past its date.

Questions this answers

Tap a question for the short answer.

How do I tell if cereal & granola has gone bad?

The warning signs are staleness, moisture, and rancidity, especially in products that contain nuts. Taste it for freshness, feel it for moisture, and smell it for rancid odors.

How long does cereal last?

About a year sealed, 6 to 12 months by the label, and 2 to 3 months opened before it goes stale. Stale cereal is safe and crisps up in a low oven; it's done when it smells rancid or has moisture or pests in the bag.

How long does granola last?

Months sealed and a few weeks opened at full quality; the nuts and oil go rancid first. Freeze it for 3 to 6 months. Store the oats and make granola in batches instead of keeping bags of it.

How do I tell if cereal and granola have gone bad?

A sharp, bitter, paint-like smell is rancid fat and the end. Moisture inside the bag, clumping, mold, webbing or moths mean the box goes. Soft and flat is only stale.

Keep going

Read nextPackaged SnacksHow long chips, crackers, pretzels, bars, cookies and trail mix keep sealed and opened, which snacks earn a place in a food store and the bag, how to store them, and stale against rancid.Food · Supply

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