Dry staples keep as long as they stay dry and uncontaminated: white rice 25 to 30 years, dried beans and lentils 10 to 30 years, and sugar, salt and honey indefinitely, while brown rice lasts only 6 to 12 months and flour 6 to 12 months once opened. Discard any dry food that is damp, mouldy, chewed or fouled by droppings, because heating does not make mouldy grain or beans safe. Check every bag by sight, smell and feel before you carry it.
Part of Seed & Food Salvage
Dry staples keep for years if they stay dry and uncontaminated, with shelf lives ranging from months to indefinite. The shelf-life figures are the parent article’s and assume dry storage.
Shelf Life Figures From the Parent Article
All figures assume the food has been kept dry.
- White rice — 25 to 30 years. Brown rice lasts 6 to 12 months because of the oils in the bran.
- Dried beans and lentils — 10 to 30 years.
- Sugar, salt, honey — indefinitely. Sugar may harden into a brick and salt may clump. Honey may crystallise and can be warmed gently to liquefy.
- Flour — 6 to 12 months in an open bag, 2 to 5 years in a sealed container.
- Dried pasta — 2 to 5 years sealed.
- Oats — 3 to 5 years sealed.
- Powdered milk — 2 to 10 years depending on packaging.
- Cooking oil — 1 to 2 years unopened.
Treat these as guides, not guarantees. A single damp season can spoil what would otherwise last for years, and the real test is condition, not age.
What to Check Before You Keep It
- Moisture — damp, clumped or caked food that is not sugar or salt is suspect.
- Mould — fuzzy patches, a musty or sour smell, or discolouration.
- Pests — small dark beetles (weevils), webbing, or tiny holes in grains. The parent article says sifting flour through fine mesh removes insects and eggs.
- Rodent damage — gnawed bags, droppings, urine smell.
- Rancidity — fats and whole-grain products smell sharp or like paint when they have gone off. The parent article says rancid oil is unpleasant but not acutely toxic.
What You Need
- A fine mesh or sieve — for flour and meal.
- Clean, dry containers with lids — to move and store what you keep.
- Good light — to see mould and droppings.
Method: Inspect, Sort, Cook Through
Step 1: Check the container An intact sealed bag or tub is the best sign. Torn, gnawed or damp packaging is a reason to look harder.
Step 2: Check the food Pour a little into a clean light-coloured bowl. Look for mould, insects, droppings and discolouration. Smell it.
Step 3: Sort Sound food goes into clean containers. Anything with mould, droppings or a sour smell is discarded, including the rest of that bag.
Step 4: Prepare beans properly Older beans take longer to cook. Soak overnight and boil for 2 to 4 hours, as the parent article says.
Undercooked red kidney beans cause poisoning, and a slow cooker makes it worse
Red kidney beans contain phytohaemagglutinin, a lectin that EFSA describes as the most toxic in commonly eaten plants. It causes violent vomiting and diarrhoea within a few hours, and a small number of raw or undercooked beans is enough.
Soak for at least 12 hours, discard the soaking water, then boil in fresh water at a full rolling boil for at least 30 minutes. EFSA and the Finnish Food Authority both give half an hour; Health Canada gives a 10-minute minimum, and measured inactivation rates put 10 minutes close to the edge, so take the longer figure.
Do not cook dried kidney beans in a slow cooker, a haybox or any retained-heat cooker. Held below boiling the toxin is not destroyed, and heating to around 80 °C can leave the beans more toxic than raw — inactivation slows by more than an order of magnitude as the temperature drops from boiling. This is the one case in this guide where low-and-slow cooking is actively dangerous rather than merely inefficient.
Other dried beans carry the same lectin in smaller amounts, so boil all of them properly. White kidney beans measure roughly two-thirds the level of dark red. Canned beans have already been heat-treated and are not affected.
Step 5: Store the keepers dry Use sealed containers, off the ground, in a cool, dry place. See Food Preservation.
Common Mistakes
- Cutting out the mouldy part — mould in grains, beans and flour spreads through the food in ways you cannot see.
- Assuming cooking fixes mould — some mould toxins survive cooking. Discard mouldy dry goods.
- Giving honey to infants — honey can carry botulism spores that are dangerous to babies under one year old. Do not feed honey to infants.
- Ignoring pests — insects in one bag move to the next.
Mould toxins and rodent contamination
Mould on grains, beans, nuts and flour can produce toxins that cooking does not remove and that you cannot see, taste or smell. Rodent droppings and urine can carry disease. Discard affected food. When cleaning a rodent-fouled storeroom, wet the droppings first and wipe them up, and avoid sweeping or stirring up dry dust, then wash your hands.
What’s Next
- Learn next: Overlooked Food Sources — where else to look
- Combine with: Canned Goods Assessment — the sealed alternative