Tuna Shelf Life: Fridge, Freezer, and Spoilage Signs

Tuna is a pantry staple for a reason: it’s versatile, protein-packed, and has an impressive shelf life. However, whether you have a pouch of seasoned tuna or a classic can, knowing how long it lasts—especially after opening—is key to safe eating.

Here is the breakdown of tuna shelf life based on storage methods.

How Long Does Tuna Last?

The longevity of tuna depends heavily on its packaging. Canned tuna is processed to last for years, while pouches have a slightly shorter shelf life.

• Pantry (Canned, Unopened): Lasts up to 3 years (1095 days).
• Pantry (Packet/Retort, Unopened): Lasts up to 18 months (540 days).
• Refrigerator (Opened Packet/Tuna): Consumed within 3–4 days.

Canned vs. Packet

• Canned Tuna: The canning process sterilizes the meat, allowing it to sit safely in your pantry for years. Always check the “Best By” date, but properly stored cans often remain safe beyond this date if undamaged.
• Tuna Pouches: These are also shelf-stable but generally have a shorter shelf life than cans, typically around 18 months.

Storage Tips for Freshness

Unopened

Store unopened cans and pouches in a cool, dry place, away from direct sunlight and heat sources like the stove. High temperatures can degrade the quality and safety of the fish over time.

Opened

Once you open a can or pouch of tuna, the clock starts ticking.

1. Transfer containers: Never store opened tuna in the metal can. Transfer leftovers to a glass or plastic airtight container.
2. Refrigerate immediately: Bacterial growth accelerates at room temperature. Get the tuna into the fridge (below 40°F) as soon as possible.
3. Label it: It’s easy to forget when you opened that can. Mark the date on the container.

How to Tell If Tuna Is Bad

Don’t risk food poisoning with bad fish. Check for these signs:

• Bulging Cans: If the can is swollen, leaking, or deeply dented, do not open it. This could be a sign of botulism, a rare but serious toxin.
• Smell: Freshly opened tuna has a strong, distinct fishy smell, but it shouldn’t be repulsive. A sour, rotten, or chemical odor means it’s trash.
• Appearance: Look for mold or unnatural discoloration. While some color variation is normal, dark brown or slimy tuna should be discarded.