How Long Tuna Fish Lasts in the Refrigerator

Cooked tuna lasts three to four days in the refrigerator; canned tuna lasts three to five days after opening

The shelf life of tuna depends on whether it is cooked, canned, or raw. Cooked tuna—whether baked, grilled, or pan-seared—stays safe to eat for three to four days when stored in an airtight container at 40°F or below. Canned tuna that has been opened lasts three to five days in the same conditions. Raw tuna is different: it should be used within one to two days and requires the coldest part of your refrigerator, ideally below 35°F.

The reason these timelines matter is bacterial growth. Tuna is a dense protein that cools slowly at the center, and once it reaches the danger zone between 40°F and 140°F, bacteria multiply rapidly. Proper storage slows that multiplication but does not stop it. After the window closes, the risk of foodborne illness rises sharply, even if the tuna looks and smells normal.

Key Takeaways

• Cooked tuna stays safe for three to four days in an airtight container on a refrigerator shelf, not the door.
• Opened canned tuna lasts three to five days; transfer it to a glass or plastic container rather than leaving it in the can.
• Raw tuna should be used within one to two days and stored in the coldest part of your refrigerator, ideally the back of the bottom shelf.
• Tuna stored in oil or brine (like canned varieties) lasts slightly longer than plain cooked tuna because the liquid slows oxidation and bacterial growth.
• Freezing tuna extends its life to two to three months for cooked tuna and up to two months for canned tuna that has been drained and transferred to a freezer container.

Why tuna spoils faster than other proteins

Tuna has a higher fat content than many other fish, and those fats oxidize quickly once the fish is cut or cooked. Oxidation creates off-flavors and odors before bacteria reach dangerous levels, so your nose often warns you before the food becomes unsafe. However, oxidation and safety are separate: tuna can smell fine and still harbor pathogens.

The muscle structure of tuna also matters. Tuna is a dense, oily fish that does not cool evenly in the refrigerator. The outer layers reach safe temperature quickly, but the center stays warmer longer. This uneven cooling creates a window where bacteria can multiply in the middle of the fish even though the outside feels cold. Cutting tuna into smaller pieces or flattening it before refrigerating helps it cool more uniformly.

How to store cooked tuna correctly

Let cooked tuna cool to room temperature before refrigerating—do not put hot food directly into the refrigerator, because it raises the temperature of surrounding foods and creates condensation that promotes bacterial growth. Once cooled, place the tuna in an airtight container: glass with a sealed lid, a freezer bag with the air pressed out, or a plastic container designed for food storage.

Store the container on a refrigerator shelf, not on the door. The door is the warmest part of the refrigerator because it is opened frequently, and temperature fluctuations there shorten shelf life. The back of the middle or bottom shelf is ideal—that is where the coldest, most stable air circulates. Label the container with the date you cooked the tuna so you know when the three- to four-day window closes.

Opened canned tuna and how long it really lasts

Once you open a can of tuna, the clock starts. The tuna inside is no longer protected by the sealed can, and air exposure begins the oxidation process immediately. Transfer the contents to a glass or plastic container with a tight-fitting lid rather than leaving it in the opened can. Metal cans, once opened, can transfer metallic flavors to the tuna and do not seal well.

Canned tuna in oil lasts slightly longer than canned tuna in water—usually four to five days versus three to four days—because the oil creates a barrier against air. If you want to extend the life, drain the liquid (oil or brine) and store the tuna in a separate airtight container. This removes some of the oxidation risk, though it also removes flavor. Drained canned tuna lasts about the same three to four days as cooked fresh tuna.

Raw tuna storage and safety

Raw tuna should be used within one to two days and requires special handling. Store it in the coldest part of your refrigerator—the back of the bottom shelf, where temperatures stay closest to 32°F. Keep it in its original packaging if it is vacuum-sealed, or transfer it to an airtight container if it came loose from the store. Do not let raw tuna sit in its own juices; those liquids can harbor bacteria and promote cross-contamination.

If you buy raw tuna and do not plan to use it within a day, freeze it immediately. Freezing stops bacterial growth and extends the safe window significantly. Thaw frozen tuna in the refrigerator overnight, never at room temperature, and use it within one to two days of thawing.

Signs that tuna has gone bad

Smell is the most reliable indicator. Fresh cooked tuna has a mild, slightly sweet ocean smell. Spoiled tuna smells sour, ammonia-like, or strongly fishy—a smell that makes you recoil. If you open the container and the odor is unpleasant, discard the tuna. Trust your nose; it is detecting volatile compounds produced by bacterial breakdown.

Appearance is a secondary check. Cooked tuna should look opaque and firm. If it appears slimy, has visible mold, or has changed color significantly (darkening or graying), it has spoiled. Canned tuna that has been refrigerated may develop a darker color or slight discoloration at the surface—this is oxidation, not spoilage, and is usually safe to eat if the smell is normal. When in doubt, throw it out. The cost of replacing tuna is far lower than the cost of foodborne illness.

Freezing tuna to extend shelf life

Freezing is the most effective way to store tuna long-term. Cooked tuna lasts two to three months in the freezer; canned tuna lasts up to two months if you drain it first and transfer it to a freezer-safe container. Freezing stops bacterial growth entirely, though it does not improve quality—frozen tuna will not taste better than fresh, only as good as it was when frozen.

To freeze cooked tuna, let it cool completely, place it in an airtight freezer container or bag, remove as much air as possible, and label it with the date. Flat freezer bags take up less space and thaw faster than rigid containers. To freeze canned tuna, drain the liquid, transfer the tuna to a freezer container, and freeze. Thaw frozen tuna in the refrigerator overnight; do not thaw at room temperature, because that allows bacteria to multiply during the thawing process.

Frequently Asked Questions

Can I eat tuna that smells a little fishy?

A mild fish smell is normal for fresh tuna. If the smell is strong, sour, or ammonia-like, the tuna has spoiled and should be discarded. When you first open a container, take a quick sniff at arm's length. If you have to bring it close to your nose to detect an odor, it is probably fine. If the smell hits you from a distance, do not eat it.

Does tuna in oil last longer than tuna in water?

Yes, slightly. Canned tuna in oil typically lasts four to five days after opening, while tuna in water lasts three to four days. The oil creates a barrier that slows oxidation. However, both should be transferred to an airtight container once the can is opened, and both should be refrigerated at 40°F or below.

What is the difference between the date on the can and how long it lasts after opening?

The date on the can (usually a "best by" date) tells you how long the unopened can stays fresh on the shelf. Once you open it, that date no longer applies. Opened canned tuna lasts three to five days in the refrigerator regardless of what the can says, because air exposure and temperature are now the limiting factors, not the seal.

Is it safe to leave tuna at room temperature while I prepare a meal?

Tuna should not sit at room temperature for more than two hours. If your kitchen is warm (above 90°F), reduce that to one hour. Bacteria multiply rapidly in the danger zone between 40°F and 140°F. If you are preparing a tuna salad or sandwich, keep the tuna in the refrigerator until the moment you need it, and return any unused portion to cold storage immediately.

Can I refreeze tuna that I thawed?

You can refreeze tuna that was thawed in the refrigerator, though quality will decline slightly with each freeze-thaw cycle. Do not refreeze tuna that was thawed at room temperature, because bacteria may have multiplied during thawing. If you thawed tuna in the refrigerator and did not use it, you have one to two days to refreeze it before it spoils.