Stockpiling without waste: the six-week sale cycle

If you've read anything about couponing, you've met the idea that grocery prices move on a "six-week sale cycle," and that the trick is to buy enough at the bottom of each cycle to last until the next one. It's a tidy theory. It's also not something any store we cover publishes, and we couldn't confirm it on any retailer's official pages. So this play keeps the useful part of the idea (buy a little ahead when the price is right) and drops the part that sends people into a garage full of expiring food.

Why the cycle is folklore

Stores do run promotions on the same product more than once a year, and some patterns may feel regular in your own store. But the timing depends on the retailer, the brand's promotion plans, the region and the product. No chain we cover publishes a calendar, and the "six weeks" figure doesn't come from any of them. Treat it as one shopper's observation that spread, not as a rule.

Build your own price record instead

The dependable alternative is to watch your own prices for the handful of things you buy most.

1. Pick ten staples. The items you buy every week or two: coffee, cereal, pasta, canned goods, toilet paper, detergent, pet food.
2. Write down the unit price each time you see them, regular and on promotion. Use the shelf tag's unit price so package sizes don't fool you; our unit price guide shows how.
3. After a couple of months, you'll know your low. That's your buy price, specific to your store.
4. When an item hits your low, buy a few weeks ahead, not a year.

How much is "a few weeks"?

Enough to reach the next time you expect to see your low, and no more than you'll use before the product's quality date. For most households that's a modest shelf, not a room. Stores also limit how far you can go with coupons: Walmart, Target, Walgreens and Dollar General each cap identical coupons per household per day in their policies.

Read the date labels correctly

This is where waste happens. According to USDA's Food Safety and Inspection Service:

• Except for infant formula, product dates are not a safety indicator and aren't required by federal law. Manufacturers add them to show when food is at its best quality.
• "Best if Used By" is the phrase FSIS recommends, because shoppers understand it as a quality date.
• "Sell-By" tells the store how long to display a product. It isn't a safety date.
• "Use-By" is the last date recommended for peak quality and isn't a safety date, except on infant formula. FSIS says not to buy or use infant formula after its "Use-By" date.

None of this means a product lasts forever. FSIS's guidance also covers spoilage signs and storage, and the USDA FoodKeeper app gives storage times by food.

Store it like you mean it

• First in, first out. New purchases go to the back; the oldest goes in front.
• Label the shelf with the month you bought something if the package date is hard to read.
• Keep it cool and dry. FSIS's shelf-stable food guidance advises storing those foods in a cool, dry place.
• Check cans. FSIS advises against using cans that are deeply dented, bulging or leaking.

Household and pet items

Paper goods, cleaning products and dry pet food are where a stockpile tends to make the most sense, because they're used steadily and many keep well when stored properly. Even so, check product labels for storage instructions, and only buy what fits your space and your budget.

The real test

A stockpile saves money only if everything in it gets used before its quality date. If you find yourself throwing things out, buy less ahead next time. Store coupon policies and promotions change, so check the current policy pages before planning a large trip.