There are three safe ways to thaw food
Freezing is the most reliable move in a kitchen. Thawing is where it gets undone, and usually not for the reason people expect.
USDA's Food Safety and Inspection Service recognizes three safe ways to thaw food: in the refrigerator, in cold water, and in the microwave. The kitchen counter is not on that list, and neither is hot water.
Why the counter fails
The reasoning is about geometry more than time. FSIS points out that even while the center of a package is still solidly frozen, the outer layer can already be sitting in the danger zone between 40°F and 140°F, where bacteria multiply rapidly.
So the visual cue people use, still frozen in the middle, is measuring the wrong part of the package. The outside got there first, and it's been there a while.
FSIS notes that frozen food is safe indefinitely while frozen, and that as soon as it warms above 40°F, any bacteria present before freezing can start multiplying again. The freezer paused them. Thawing unpauses them, and where you thaw determines what temperature they wake up at.
For completeness, FSIS's list of places not to thaw food is longer than just the counter: not outdoors, not on a porch, not in a garage or basement, and not in a dishwasher.
The refrigerator, and the part that saves food
This is the recommended method, and the reason is simple. The food stays at 40°F or below the entire time.
The cost is patience. FSIS puts large items like a turkey at a full 24 hours per five pounds. More surprising: even a pound of ground meat or a couple of boneless chicken breasts needs a full day. Two useful variables they mention, both of which connect to knowing your own appliance: some areas of a refrigerator are colder than others, and food thaws more slowly at 35°F than at 40°F.
Here's the part that actually reduces waste, and it's the most under-known fact in this whole area. After thawing in the refrigerator, food doesn't become a cook-tonight emergency. FSIS says ground meat, stew meat, poultry, and seafood stay safe and good quality for an additional day or two before cooking. Red meat cuts, meaning roasts, chops, and steaks, get three to five days.
Most people treat a thawed package as a deadline and either cook something they didn't want or throw it out. Thawed in the fridge, it isn't a deadline. It's a normal refrigerated item with a normal window.
Cold water, when you forgot
Faster, but it needs supervision. FSIS specifies a leak-proof package or plastic bag submerged in cold tap water, with the water changed every 30 minutes so thawing continues.
The leak-proofing matters for two reasons: a leaking bag lets bacteria in from the surrounding environment, and the meat tissue can absorb water and come out watery.
Their timings: about a pound of meat, poultry, or seafood may thaw in an hour or less, a three to four pound package in two to three hours, and a whole turkey at roughly 30 minutes per pound. Once it's fully thawed, cook it immediately.
The microwave, as a last resort
It works, and FSIS attaches a firm condition: cook it immediately after thawing, because parts of the food may become warm and actually begin to cook during the process, putting those areas into the danger zone.
One difference between the methods worth knowing if you're managing a freezer. FSIS says food thawed by the cold water method should be cooked before refreezing, and the same for the microwave. The refrigerator method is the one they don't attach that condition to, which makes it the only route that leaves your options open.
And the option nobody uses
You can just cook it frozen. FSIS says it's safe, and the only real cost is time: roughly 50 percent longer than the recommended time for thawed or fresh meat and poultry, with a thermometer to confirm the center actually got there.
For a weeknight where the alternative is takeout and a package that goes back in the freezer for its third round trip, that's a reasonable trade.
The through line: freezing buys you time, and the thaw is where the time either gets spent well or thrown away. Plan for the fridge when you can, use cold water when you didn't, and remember that fridge-thawed food gives you days rather than hours. Savery counts a thawed item from the day it comes out, not from the day it went in.