Safety and Inspection Service
United States Department of Agriculture
Washington, D.C. 20250-3700
Consumer Education and Information
Slightly Revised January 1999
Safe Defrosting Methods for Consumers
Uh, oh! Youre home and
forgot to defrost something for dinner. You grab a package of meat or chicken and use hot
water to thaw it fast. But is this safe? What if you remembered to take food out of the
freezer, but forgot and left the package on the counter all day while you were at work?
Neither of these situations are
safe, and these methods of thawing lead to foodborne illness. Food must be kept at a safe
temperature during "the big thaw." Foods are safe indefinitely while frozen.
However, as soon as food begins to defrost and become warmer than 40 єF, any bacteria
that may have been present before freezing can begin to multiply.
"Foods should never be thawed
or even stored on the counter, or defrosted in hot water. Food left above 40 єF
(unrefrigerated) is not at a safe temperature," cautions Bessie Berry, manager of the
USDA Meat and Poultry Hotline.
Even though the center of the
package may still be frozen as it thaws on the counter, the outer layer of the food is in
the "Danger Zone," between 40 and 140 єF at temperatures where bacteria
"When defrosting frozen
foods, it's best to plan ahead and thaw food in the refrigerator where food will remain at
a safe, constant temperature -- 40 єF or below," recommends Berry.
There are three safe ways to
defrost food: in the refrigerator, in cold water, and in the microwave.
Planning ahead is the key to this
method because of the lengthy time involved. A large frozen item like a turkey requires at
least a day (24 hours) for every 5 pounds of weight. Even small amounts of frozen food --
such as a pound of ground meat or boneless chicken breasts -- require a full day to thaw.
When thawing foods in the refrigerator, there are several variables to take into account.
Some areas of an appliance may
keep the food colder than other areas. Food placed in the coldest part will require longer
Food takes longer to thaw in a
refrigerator set at 35 єF than one set at 40 єF.
After thawing in the refrigerator,
ground meat and poultry should remain useable for an additional day or two before cooking;
red meat, 3 to 5 days. Foods defrosted in the refrigerator can be refrozen without
cooking, although there may be some loss of quality.
COLD WATER THAWING
This method is faster than
refrigerator thawing but requires more attention. The food must be in a leak-proof package
or plastic bag. If the bag leaks, bacteria from the air or surrounding environment could
be introduced into the food. Also, meat tissue can also absorb water like a sponge,
resulting in a watery product.
The bag should be submerged in
cold tap water, changing the water every 30 minutes so it continues to thaw. Small
packages of meat or poultry about a pound may defrost in an hour or less. A
3- to 4-pound package may take 2 to 3 hours. For whole turkeys, estimate about 30 minutes
per pound. After defrosting, refrigerate the food and cook it promptly. Foods thawed by
the cold water method should be cooked before refreezing.
When microwave defrosting food,
plan to cook it immediately after thawing because some areas of the food may become warm
and begin to cook during microwave defrosting. Holding partially cooked food is not
recommended because any bacteria present wouldn't have been destroyed and, indeed, may
have reached optimal temperatures for bacteria to grow.
Foods thawed in the microwave
should be cooked before refreezing.