Refrigerator Thawing Time

Refrigerator thawing: rule and example

Thawing in the fridge at ~4°C works out to roughly ~5 hours per 500 g. So a 1.5 kg whole chicken needs around 15 hours, a 300 g steak about 3 hours, and small shrimp about 6 hours. Both the USDA and ANVISA RDC 216/2004 point you toward this method, since the food never climbs above 5°C and stays clear of the bacterial danger zone (5-60°C).

Context and alternatives

Cold water cuts that to about 1 hour per 500 g, but you have to seal the food in a leak-proof bag and swap the water every 30 minutes. The microwave defrost setting is quicker still, though the edges start to cook while the middle is rock solid, so whatever comes out goes straight into the pan. Never thaw on the countertop. Within an hour the outer surface is already in the 5-60°C danger zone and bacteria take off. One nice bonus of the fridge method: if your plans change you can refreeze the food without worry.

FAQ

How long for a 2 kg roast? Around 20 hours, so move it from freezer to fridge the day before you need it.

Can I refreeze meat thawed in the fridge? You can, provided it stayed around 4°C the whole time. The texture might take a small hit.

What about ground beef? Same rule, ~5h per 500g. Because ground meat has so much more surface area, the contamination risk is higher, which is exactly why you should never leave it on the counter.

Does the rule work for fish? It does, though lean fish like cod or tilapia thaws a touch faster than oily fish like salmon because of the water content.