Can I refreeze food that has been thawed?

The FSA position, the difference between safe and good, and the cook-then-freeze route that solves most cases.

Difficulty: beginner
Time: 5 min
Read: 3 min
Safety: warning

Short answer

Raw food thawed in the fridge and still properly cold can be refrozen, but the texture suffers. The better answer is almost always to cook it and freeze the cooked dish — that is safe, and it gives you a meal instead of a worse ingredient.

Refreezing raises two separate questions that get muddled: is it safe, and is it any good. They have different answers, and the practical route avoids both.

Safety

Raw food thawed in the fridge and still cold can be refrozen, though the quality suffers. Never refreeze anything that has been above 8°C for more than two hours, and never refreeze food thawed at room temperature or in warm water. If in doubt, cook it thoroughly and freeze the cooked dish instead.

Step by step

Establish how it was thawed.In the fridge, still cold to the touch, means it never left safe temperatures. On the worktop or in warm water means bacteria have had the chance to multiply.
Refreeze fridge-thawed raw food if you must.The FSA position is that food thawed in the fridge and kept below 8°C throughout can be refrozen. Do it promptly rather than leaving it another day.
Never refreeze anything thawed at room temperature.The surface will have spent hours in the range where bacteria multiply fastest, and freezing pauses them rather than killing them. They resume when it thaws again.
Cook it and freeze the dish instead.This is the answer in most cases. Cooking thawed raw food thoroughly and then freezing the finished dish is safe, and it converts an ingredient you would have wasted into a meal.
Expect quality loss either way.Every freeze-thaw cycle ruptures more cells with ice crystals. Meat loses moisture and goes grainy, vegetables go soft, and fish suffers worst of all.
Do not refreeze anything that was frozen cooked.Cooked food thawed then refrozen then reheated is a lot of temperature cycling for one dish. Once cooked and thawed, eat it within two days.
Treat ice cream as a special case.Thawed and refrozen ice cream is a listeria risk as well as being ruined texturally. Discard it rather than refreezing.
Use the freezer thermometer as evidence.A freezer at or below -18°C keeps food safe indefinitely. If it has risen above that, the question is how long and how far.
Label anything refrozen.So it is used first and nobody refreezes it a third time.
Portion before freezing next time.Most refreezing questions arise because a large pack was thawed for a small meal. Freezing in meal-sized portions removes the problem entirely.

Tips

Cook it, then freeze it. That single move answers almost every refreezing question.
Fridge-thawed and still cold is the only situation where refreezing raw food is reasonable.
Portion things before they go in the freezer and you will rarely face this.

Common mistakes

Refreezing meat that thawed on the worktop — The outer surface will have been in the 8 to 63°C range for hours, where bacteria double every twenty minutes. Freezing halts them but does not kill them, so the count is still there and rising again on the next thaw.
Assuming freezing kills bacteria — It suspends them. A food that was heavily contaminated before freezing is heavily contaminated after thawing, which is why the temperature history before freezing matters as much as the freezing itself.

If it doesn't work

Thawed more mince than needed

Cause: Frozen in one large pack — Fix: Cook all of it and freeze the cooked dish. Portion before freezing next time.

Food thawed on the worktop overnight

Cause: Unsafe thawing — Fix: Do not refreeze. If it has been out more than two hours, discard it.

Refrozen meat watery and grainy

Cause: Ice crystal damage from two cycles — Fix: Use it in a stew or bolognese where texture matters less.

Freezer door left open overnight

Cause: Contents may have thawed — Fix: If food still has ice crystals and is below 8°C it can be refrozen. Anything soft and warm should be cooked immediately or discarded.

Questions people ask

Is it safe to refreeze raw chicken?

If it was thawed in the fridge and has stayed below 8°C, yes, though the texture suffers. If it was thawed at room temperature, no. Cooking it and freezing the cooked dish is the better option in both cases.

Can I refreeze bread and baked goods?

Yes, and they suffer far less than meat because there is much less free water to form damaging crystals. Bread thawed and refrozen is noticeably drier but perfectly usable for toast.