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Keep fish cold from the moment you buy it until it is cooked. Get it onto ice, into a refrigerator at 40°F (4°C) or below, or into the freezer within two hours of purchase—or within one hour if it has been exposed to 90°F (32°C) or higher. Refrigerate fish you will use soon, freeze fish for longer storage, thaw it in the refrigerator or in cold water, and never leave it on the counter.
What to do as soon as you buy fish
FoodSafety.gov guidance for the United States treats time and temperature as the main safety controls. Choose seafood that is already refrigerated or displayed on fresh ice, then minimize the time it spends warming during your trip home.
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- Put fresh fish on ice, in a refrigerator, or in a freezer within two hours after purchase.
- Use a one-hour limit when the fish has been exposed to 90°F (32°C) or above, such as inside a hot car.
- These limits cover the trip and other time before chilling. They are not a later allowance to leave fish out while preparing or serving it.
- Keep raw seafood separate from ready-to-eat food during shopping, transport, storage, and preparation.
Plan the shopping trip so seafood is one of the last items you select. If you have other errands, use an insulated cooler with ice to keep the fish cold continuously rather than relying on the car’s air conditioning. Once home, unpack it immediately; do not leave the bag on a counter while you put away groceries.
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At the store, avoid frozen packages that are open, torn, crushed, soft or bendable, or covered with unusual frost or ice crystals. Those signs can indicate long storage or that the package thawed and refroze; they are selection warnings, not proof of what happened after you get home.
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How cold should fish be stored?
Set the refrigerator to 40°F (4°C) or below and verify it with a refrigerator thermometer rather than relying only on the dial setting. Place fish in the coldest practical part of the refrigerator and keep its package from leaking onto other foods. A thermometer is especially useful after a power interruption, when the door has been left open, or when the appliance seems to cycle unusually often.
FoodSafety.gov advises using refrigerated seafood within two days. Its Cold Food Storage Chart gives a more specific quality window for some categories: fatty fin fish can be refrigerated for 1–3 days. Because species, freshness at purchase, packaging, and refrigerator performance differ, use the shorter end of a range when you are unsure and freeze fish that will not be cooked promptly.
Count storage time from when the fish was purchased or received, not from when you happen to open the package. If you bought fish already close to its use-by date, the home window may be shorter. Follow a product label when it gives a more restrictive instruction.
Refrigerated and frozen storage limits
| Fish or storage condition | Refrigerator at 40°F (4°C) or below | Freezer at 0°F (-18°C) or below |
|---|---|---|
| Seafood, general FoodSafety.gov advice | Use within 2 days | Freeze when it will be held longer |
| Fatty fin fish, Cold Food Storage Chart | 1–3 days | 2–3 months for best quality |
| Lean fish, listed types on the chart | Follow the chart entry for the specific type | Some entries list 6–8 months; others list 4–8 months for quality |
The chart’s freezer periods are quality recommendations, not a hard safety cutoff. Fish kept continuously frozen at 0°F (-18°C) or below remains safe indefinitely, although its flavor and texture can deteriorate over time. Freezing preserves fish until cooking; it does not destroy harmful germs that may already be present.
Quality declines faster when a package is exposed to air, fluctuating temperatures, or repeated partial thawing. Date and label each package, arrange older portions where you can see them, and use the listed period as a quality target rather than waiting until the last day if the fish has already been stored poorly.
How to package fish for the refrigerator or freezer
Keep raw fish in a closed package or container that prevents liquid from contacting other foods. If the original package is damaged, place the fish in a clean leak-resistant container before refrigerating or freezing it. Store it so ready-to-eat foods cannot be contaminated by drips. A tray or shallow container under the package provides an additional barrier against leakage.
For freezing, label the package with the date and fish type so you can use the quality windows appropriate to that fish. Keep the freezer at 0°F (-18°C) or below. A refrigerator thermometer confirms the refrigerator compartment is cold enough; a separate freezer reading is useful if your appliance has no reliable temperature display.
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Freeze portions in amounts you expect to cook at one time. A sealed package reduces air exposure and makes later thawing more even. Do not rely on frost on the outside of a package as a safety indicator: freezer burn affects quality, while continuous freezing is the safety control.
Three safe ways to thaw fish
Choose a method that keeps the fish cold and matches when you can cook it. Refrigerator thawing takes planning but gives the most gradual temperature control. Cold-water thawing is faster, while microwave defrosting is an emergency convenience that requires immediate cooking.
| Method | Time and handling | What to do afterward |
|---|---|---|
| Refrigerator | Place frozen seafood in the refrigerator to thaw gradually, typically overnight. | Keep it refrigerated after thawing and cook it within the refrigerated-storage window. |
| Cold water | Seal the fish in a plastic bag, immerse it in cold water, and change the water every 30 minutes. | Cook immediately after it thaws. |
| Microwave defrost | Use the defrost setting; stop while the fish is icy but flexible. | Cook immediately, because parts of the fish may have begun warming or cooking. |
The comparison is mainly about planning time and what happens next. The refrigerator method is slowest but leaves the fish cold and gives you flexibility. Cold water shortens the wait but requires attention to the 30-minute water changes and immediate cooking. A microwave is fastest for a last-minute meal, but uneven heating means it cannot be followed by storage for later.
Refrigerator thawing
- Leave the fish in a sealed package or put it in a leak-resistant container.
- Place it in the refrigerator, where the temperature is 40°F (4°C) or below.
- Allow it to thaw gradually, usually overnight.
- Once thawed, keep it refrigerated until cooking and use it within the applicable refrigerated-storage period.
Put the package on a lower shelf or in a container that can catch leaks. Thick portions may need more than one night, so start early rather than moving the fish to a warmer method at the last minute. This is the only method in the guidance that does not require cooking immediately after thawing. It is therefore the best option when you need flexibility about the exact cooking time.
Cold-water thawing
- Put the fish in a watertight plastic bag. A sealed package prevents water from diluting the fish and keeps the fish from contacting the sink or surrounding food.
- Submerge the bag completely in cold water.
- Change the water every 30 minutes so it stays cold.
- Cook the fish immediately when it is thawed.
Do not use warm or hot water. The objective is to thaw the center without allowing the outside to remain in a temperature range where germs can multiply quickly. If the bag leaks, transfer the fish to a new watertight bag before continuing and clean the sink and surrounding surfaces afterward.
Microwave defrosting
- Use the microwave’s defrost setting rather than a full-power cooking cycle.
- Stop when the fish is still icy but flexible. Do not continue until it is warm or fully cooked at the edges.
- Transfer it directly to cooking and cook it immediately.
Microwave thawing is practical only when you are ready to cook. Uneven heating can leave some portions warmer than others, so do not return microwave-thawed fish to the refrigerator for later use. Arrange pieces in a single layer when possible and follow the appliance’s defrost instructions, but use the icy-and-flexible endpoint as the safety cue.
Can you thaw fish on the counter?
No. Do not thaw fish at room temperature on a counter, in a cupboard, or beside a sink. The surface can warm into an unsafe range while the center is still frozen, and the fish can remain there for longer than the two-hour or one-hour limits before anyone notices.
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Use the refrigerator, cold water in a sealed bag, or the microwave defrost setting instead. If fish has already been left on the counter long enough to exceed the applicable time limit, discard it rather than trying to rescue it by cooking or refreezing. Cooking can kill some germs, but it does not undo every hazard created by improper holding.
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Raw fish can transfer germs to foods that will not be cooked. Treat every surface and utensil that touches raw seafood as contaminated until it has been cleaned.
- Wash your hands with soap and water for at least 20 seconds after handling raw fish and before touching ready-to-eat food.
- Use separate plates, cutting boards, knives, and utensils for raw fish and cooked or ready-to-eat foods, or wash them thoroughly between uses.
- Clean counters, boards, dishes, and utensils with soap and hot water after raw-fish contact.
- Keep raw seafood and its juices away from salads, fruit, bread, cooked food, and other items that will not receive further cooking.
- Do not put cooked fish back on the unwashed plate that held it raw.
Wash hands again after handling the package, marinade, or thawing water. Clean the refrigerator shelf or drawer if raw juices spill. These steps matter during preparation even if the fish was stored correctly. The two-hour and one-hour limits apply before chilling and do not make it safe to leave raw or cooked fish sitting out later.
How to cook thawed fish safely
Cook fish to an internal temperature of 145°F (63°C). A food thermometer gives the most direct check, especially for thick fillets, stuffed portions, or pieces that cook unevenly. FoodSafety.gov also describes the endpoint as flesh that is no longer translucent and separates easily with a fork.
- Insert the thermometer into the thickest part of the fillet or portion, avoiding the pan, bone, or a thin edge.
- Check more than one thick portion when pieces differ substantially in size.
- Remove fish from heat once the thickest part reaches 145°F (63°C), then serve using clean utensils.
Color alone is less reliable than temperature because species, lighting, and cooking method change how opaque fish appears. The fork test is a useful additional sign, not a reason to ignore a thermometer reading when one is available. Clean the thermometer probe between portions if it touches raw fish and cooked food.
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Discard seafood with a sour, rancid, strongly fishy, or ammonia-like odor. Cooked seafood that smells of ammonia should not be eaten. Do not taste questionable fish to decide whether it is safe.
Smell is a discard cue, not a substitute for time and temperature controls. Fish can carry harmful germs without an obvious odor, so fish that exceeded the storage or thawing limits should be discarded even if it smells normal. Conversely, a strong off-odor is enough reason to discard it even when the stated time has not elapsed.
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Common storage and thawing mistakes
Leaving fish in the car
A normal trip home should end with fish in the refrigerator, on ice, or in the freezer within two hours of purchase. In weather or a vehicle at 90°F (32°C) or higher, use the one-hour limit. A cooler with ice can keep the fish cold during a longer journey, but the fish still needs to be chilled continuously.
Assuming a cold refrigerator dial proves the temperature
Appliance dials are not precise temperature measurements. Verify 40°F (4°C) or below with a refrigerator thermometer, and investigate if the reading is higher before storing perishable fish there.
Refreezing fish after a rapid thaw
Cold-water and microwave thawing are paired with immediate cooking in the guidance. Do not thaw fish by either method and then put it back in the refrigerator or freezer for later. Refrigerator-thawed fish can remain refrigerated for cooking within its storage window.
Believing freezing makes unsafe fish safe
Freezing preserves fish but does not destroy harmful germs. Start with fish that has been kept within the time and temperature limits, then thaw it using a cold method.
Using the smell test alone
Odor can identify obvious spoilage, but a normal smell cannot prove that fish was held safely. Check the clock, storage temperature, and thawing method as well.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A simple decision checklist
- At purchase: Choose refrigerated or iced fish; reject damaged, soft, or heavily frosted frozen packages.
- On the way home: Keep the fish cold and observe the two-hour limit, reduced to one hour at 90°F (32°C) or above.
- For the next two days: Refrigerate at 40°F (4°C) or below and plan to cook within that period; the chart gives fatty fin fish a 1–3-day quality window.
- For longer storage: Freeze at 0°F (-18°C) or below and use the type-specific quality period, such as 2–3 months for fatty fin fish.
- When thawing: Use the refrigerator overnight, cold water with 30-minute water changes, or microwave defrost only when immediate cooking is possible.
- Before cooking: Wash hands and clean all raw-fish equipment and surfaces with soap and hot water.
- At the endpoint: Cook to 145°F (63°C), or until opaque and easily separated with a fork, and serve with clean utensils.
- When in doubt: Discard fish that exceeds the time limits or develops sour, rancid, fishy, or ammonia-like odors.
This guidance reflects U.S. federal FoodSafety.gov recommendations. Local rules, species-specific labeling, and commercial handling instructions can differ, so follow a product label when it is more restrictive.
Frequently Asked Questions
How long can fish stay in the fridge?
FoodSafety.gov advises using refrigerated seafood within two days at 40°F (4°C) or below. The Cold Food Storage Chart lists fatty fin fish at 1–3 days for quality, so use the shorter end when freshness or temperature is uncertain.
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Can I thaw fish on the counter?
No. Room-temperature thawing can warm the outside while the center remains frozen. Thaw in the refrigerator, in cold water inside a sealed bag, or in the microwave only when you can cook immediately.
How do I thaw fish quickly?
Seal it in a watertight plastic bag and submerge it in cold water, changing the water every 30 minutes. Cook immediately after thawing. Microwave defrosting is another rapid option, but it also requires immediate cooking.
Can I refreeze fish after thawing?
Cold-water and microwave-thawed fish should be cooked immediately rather than returned to storage. Fish thawed in the refrigerator can remain refrigerated and be cooked within the applicable storage window.
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Cook fish to 145°F (63°C). The flesh should also be no longer translucent and should separate easily with a fork. A food thermometer is the most dependable check.
How can I tell if fish has gone bad?
Sour, rancid, strongly fishy, or ammonia-like odors are discard cues; cooked seafood with an ammonia odor should not be eaten. A normal smell does not prove that fish was stored safely, so also check time and temperature.
What tools help with safe fish storage?
A refrigerator thermometer verifies that the refrigerator is at 40°F (4°C) or below, and a food thermometer checks the 145°F (63°C) cooking endpoint. These tools support safe handling but do not replace time limits or clean preparation.
The Bottom Line
Keep fish cold: refrigerate it at 40°F (4°C) or below and use it within two days, or freeze it at 0°F (-18°C) or below for longer storage. Thaw overnight in the refrigerator, in cold water with 30-minute changes, or in the microwave only when you will cook immediately. Never thaw fish on the counter, prevent raw juices from contacting ready-to-eat foods, and cook fish to 145°F (63°C).
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