Canned food lasts indefinitely if the can remains undamaged and properly sealed, according to the USDA. The "best by" or "use by" date on cans is a quality date, not a safety date. This means canned foods remain safe to eat long after their printed expiration dates, making them reliable for emergency storage and reducing unnecessary food waste.
Best-By vs. Use-By vs. Expiration: What They Actually Mean
- "Best by" / "Best if used by": The manufacturer's estimate of when peak quality ends. The food is still safe after this date; only taste and texture may decline.
- "Use by": Similar to "best by" for most shelf-stable products. On refrigerated items, this carries more weight.
- "Sell by": A store inventory date, completely irrelevant to the consumer.
The only date that matters for safety is whether the can has been compromised.
Shelf Life by Food Type
| Food Type | Peak Quality | Still Safe Beyond Peak |
|---|---|---|
| High-acid (tomatoes, citrus) | 12–18 months | Yes, but quality degrades faster |
| Low-acid (meat, vegetables, beans) | 2–5 years | Often decades |
| Canned meat (tuna, chicken, Spam) | 3–5 years | Yes, many last 10+ years |
| Canned soup | 2–3 years | Yes |
| Emergency #10 cans (nitrogen-flushed) | 25–30 years | Designed for maximum safety life |
How to Tell If a Can Has Actually Gone Bad
Discard any can that shows:
- Bulging or swelling — indicates bacterial gas production (potentially botulism)
- Dents on the seam — compromises the seal (small dents on the body are usually fine)
- Rust that penetrates the can wall — surface rust alone is typically safe; deep rust is not
- Spurting liquid or off smell when opened — discard without tasting
The Case for #10 Cans Over Standard Grocery Cans
Standard commercial cans use a standard sealing process with no oxygen removal. Emergency-grade #10 cans are nitrogen-flushed and double-sealed specifically for 25–30 year storage. For serious long-term storage, they're a completely different product.
👉 Mountain House #10 Cans – 25-Year Shelf Life, Nitrogen-Flushed and Sealed
👉 Dehydrated Diced Carrots #10 Can – 216 Servings, Long-Term Storage
👉 Future Essentials Dry Soup Mix Variety – 12 Cans, Long-Term Pantry Staple