How Long Does Food Actually Last Past the Date on the Package?

The dates on packaging aren't a single, standardized system

"Sell by," "best by," "use by," and "best if used by" all appear on US food packaging, and — with the narrow exception of infant formula — none of them are federally regulated safety dates. They're manufacturer-chosen quality estimates, and the specific wording is chosen by the company, not mandated by USDA or FDA for most products. This is genuinely confusing, and the confusion is a real, documented cause of unnecessary food waste — surveys have found many US households discard food based on a "sell by" date alone, treating a retailer stocking instruction as if it were a safety deadline for the consumer.

What each phrase is actually trying to communicate

"Sell by" is a date aimed at the retailer, telling the store how long to display the product for sale — it's inventory guidance, not a deadline for the food to be consumed or discarded by the date it reaches a shopper's home. Food is often still perfectly good well past its "sell by" date if stored properly.

"Best by" or "best if used by" is a quality estimate aimed at the consumer, indicating when the manufacturer expects peak flavor, texture, or nutritional quality — not a safety cutoff. A product past its "best by" date isn't inherently unsafe; it may simply be somewhat past its peak in taste or texture.

"Use by" is the closest thing to a safety-oriented date among the common phrases, most often appearing on perishable, more safety-sensitive products, though it's still a manufacturer's estimate rather than a government safety standard for the vast majority of foods.

Where USDA FoodKeeper guidance fits into this

Because package dating is inconsistent and manufacturer-driven, USDA's FoodKeeper resource exists as a separate, standardized reference for how long specific foods actually keep in the pantry, fridge, and freezer under proper storage — independent of whatever wording happens to be printed on that particular product's package. This is exactly the data this site's storage pages are built from: real, USDA-sourced pantry/fridge/freezer windows for each ingredient, rather than relying on package language that varies by manufacturer and doesn't map cleanly to a single safety standard.

This is also why a product can be genuinely fine to use for a period after its printed date (assuming it's been stored properly and shows no spoilage signs) — the printed date reflects a manufacturer's quality estimate, and USDA FoodKeeper's storage windows, built from actual food-safety and food-science data, are frequently longer, particularly for shelf-stable pantry goods.

Where package dates DO matter more directly

Infant formula is the genuine exception — its "use by" date IS federally regulated, tied specifically to nutrient degradation over time, and should be treated as a hard cutoff rather than a flexible quality estimate the way most other package dates are.

Highly perishable, higher-risk foods — raw meat, poultry, seafood, and fresh dairy — are also worth treating with more caution around printed dates than a shelf-stable pantry good, not because the date itself carries different legal weight, but because these categories carry meaningfully higher foodborne-illness risk if genuinely spoiled or mishandled, and spoilage in these categories can progress faster and less visibly than in a dry pantry good.

Trust your senses — but understand what they can and can't tell you

For most foods, genuine spoilage signs (off smell, visible mold, sliminess, significant discoloration — the specific cues listed on each ingredient's storage page on this site) are a more reliable guide to whether something is still good than the printed date alone, because they reflect what's actually happening to that specific item rather than a generic manufacturer estimate.

The important caveat, covered in more depth in this site's guide to the USDA danger zone: some foodborne pathogens don't produce obvious smell, taste, or appearance changes even when present at hazardous levels — which is why time-and-temperature handling (how long something sat unrefrigerated, whether it was cooked to a safe internal temperature) matters independently of how the food looks or smells, especially for raw meat, poultry, seafood, and egg dishes.

A practical way to think about any date on a package

Ask whether the food is highly perishable (dairy, meat, seafood, prepared leftovers) or shelf-stable (canned goods, dry pantry staples, most condiments) — shelf-stable foods routinely remain safe well past a "best by" date if the package is undamaged and the product shows no spoilage signs, while perishable foods deserve more conservative handling relative to their printed date and, more importantly, relative to how long they've actually been stored and at what temperature.

This site's dedicated storage pages for each ingredient, and its "how long does it last" and "can you freeze it" pages, are built to answer this more precisely than a package date alone can — using USDA FoodKeeper's sourced windows rather than the inconsistent, manufacturer-chosen phrasing printed on any individual product.

Why some foods barely change at all past their printed date

Dry pantry staples — rice, dried pasta, flour, sugar, most dried beans — are shelf-stable specifically because they contain too little available moisture to support the microbial growth that causes most food spoilage. A bag of white rice well past its "best by" date, stored in a cool, dry place in a sealed container, is very often still perfectly good, because nothing about the printed date reflects a genuine safety cliff for a product this dry and stable — the date is closer to a very conservative quality estimate than anything resembling an expiration in the way it would apply to a carton of milk.

Canned goods follow similar logic: the canning and sealing process itself is what makes them shelf-stable, not the printed date, and properly canned, undamaged food can remain safe for a long time past a "best by" date, though texture and flavor quality can gradually decline. The signal to actually watch for on canned goods isn't the date at all — it's the can's physical condition: bulging, leaking, or a damaged seal are genuine red flags regardless of what the printed date says, while an undented, properly sealed can well past its date is a very different situation.

A note on why this confusion persists

Part of why package dating causes so much unnecessary food waste is that the same phrase — "best by," say — can appear on a jar of pickles (genuinely fine for a long time past that date) and a carton of fresh-cut deli meat (a product where more caution is warranted), with nothing on the package itself signaling how conservatively that specific date should be interpreted. There's no single federal standard tying the wording to a consistent level of caution across food categories, which is exactly why category-specific, sourced storage guidance — like USDA FoodKeeper, or this site's per-ingredient storage pages — is a more reliable reference than trying to interpret package language as if it followed one consistent rulebook.