Concept · under Time and temperature
How to cool cooked food in two stages
Cooked food cools in two legs: from 135°F to 70°F (57°C to 21°C) within 2 hours, then down to 41°F (5°C) or below, with the whole trip done inside 6 hours. If you only remember one leg, make it the first; it's the strict one.
- ExamPFH
- Questions here6
- UpdatedOct 14, 2026
On this page 5 sections
The cooling curve
Why the first leg gets the short clock
Some bacteria survive cooking as spores. Clostridium perfringens is the one the FDA's own cooling references keep coming back to, in chili and in cooked beef. Once the food drops from cooking heat toward room temperature, those spores wake up, and every extra hour is growing time. The 2-hour limit to 70°F is there to rush food through the warm part of the danger zone.
Spore-formers are a different crowd from the Big 6 pathogens, which come into a kitchen with a sick worker. Cooling is about what was already in the food.
Food made from room-temperature ingredients gets a single leg: down to 41°F within 4 hours (FDA Food Code 2022, 3-501.14(B)). The code's own examples are reconstituted foods and canned tuna, so a tuna salad mixed from shelf-stable cans has 4 hours to get cold.
Thawing is the same problem from the other side: the outside of the food creeping up into the zone while the middle is frozen. Thawing food safely covers the four methods that avoid it. Both sit under time and temperature.
Ways to move the heat out
Make it thinner
Split a stockpot of chili or a big braise into shallow pans or smaller portions. Depth is what holds heat in.
Cut big pieces down
Slice a roast or a turkey breast before it cools. One whole piece cools from the outside in, and the center lags for hours.
Use cold on purpose
Set the container in an ice-water bath and stir, or stir with an ice paddle. A blast chiller does the same job faster.
Add ice as an ingredient
For a stock or sauce made with water, part of that water can go in as ice at the end.
Give it air in the cooler
Space the pans so cold air reaches the walls, and leave them loosely covered while they cool (3-501.15).
Probe at hour 2
Write down the time and the temperature. Hour 2 is where a slow batch shows itself.
Run the clock
Two legs, two clocks. Check which leg a question is asking about before you answer.
Each question is a chit, an order ticket. Answer it and it flips to show why every option is right or wrong.
No. 01
How quickly should cooked TCS food be cooled from 135°F to 70°F?
Pick one. The chit flips to a note on every option.
Notes on No. 01
- A
Within 4 hours Four hours is the limit for the second stage, from 70°F down to 41°F, not the first.
- B
Within 2 hours Correct: TCS food (formerly PHF) must drop from 135°F to 70°F within 2 hours, because bacteria grow fastest in that range.
- C
Within 6 hours Six hours is the total cooling time, and the first stage gets only 2 of them.
- D
Within 8 hours Eight hours exceeds the entire cooling limit, so food cooled this slowly must be thrown out.
- A
No. 02
What is the maximum time allowed to cool foods from 70°F to 41°F?
Pick one. The chit flips to a note on every option.
Notes on No. 02
- A
2 hours Two hours is the first-stage limit, from 135°F to 70°F.
- B
6 hours Six hours is the total for both stages, not the second stage alone.
- C
4 hours Correct: After reaching 70°F, food has 4 more hours to get to 41°F or below, for a 6-hour total.
- D
8 hours Eight hours is past the total cooling limit, so the food must be discarded.
- A
No. 03
What is the proper method for cooling hot foods safely?
Pick one. The chit flips to a note on every option.
Notes on No. 03
- A
Two-stage cooling method Correct: Two-stage cooling brings food from 135°F to 70°F in 2 hours and to 41°F within 4 more, using shallow pans, ice baths, or ice wands.
- B
Put directly in freezer A big hot batch in the freezer cools slowly in the center and can warm up food stored around it.
- C
Leave at room temperature Room temperature keeps food in the danger zone far too long.
- D
Cover and refrigerate immediately A tight cover traps heat and a large container cools too slowly; cool loosely covered, then cover once cold.
- A
No. 04
How should hot soup be cooled before refrigeration?
Pick one. The chit flips to a note on every option.
Notes on No. 04
- A
Cool at room temperature Letting soup sit out keeps it in the danger zone for hours.
- B
Transfer to shallow pans and use ice bath Correct: Shallow pans plus an ice bath, with stirring, pull heat out fast enough to meet the 2-hour and 4-hour cooling limits.
- C
Leave in pot to cool A deep stockpot holds heat in the center for hours.
- D
Put hot soup directly in refrigerator A full pot of hot soup cools too slowly in the fridge and can warm other food around it.
- A
No. 05
Which food service process most commonly leads to spore germination?
Pick one. The chit flips to a note on every option.
Notes on No. 05
- A
Rapid heating on high flame Fast heating moves food through the danger zone quickly, which limits growth.
- B
Slow cooling of large batches Correct: Large batches cooling slowly sit in the danger zone for hours, which is when surviving spores germinate and multiply.
- C
Hot holding at 135°F or above Holding at 135°F or above keeps spores from becoming active bacteria.
- D
Quick freezing in a blast chiller Blast chilling pulls food through the danger zone quickly, which prevents germination.
- A
No. 06
What is the proper method for cooling rice?
Pick one. The chit flips to a note on every option.
Notes on No. 06
- A
Spread in shallow pans, refrigerate uncovered Correct: A thin layer of rice in a shallow pan, uncovered until cold, releases heat fast and limits the time B. cereus has to grow.
- B
Cool it on the counter at room temperature Rice at room temperature is the classic B. cereus setup, since spores survive cooking and grow as it cools.
- C
Cover tightly and put it straight in the cooler A tight cover traps steam and heat and slows cooling; cover it once it's cold.
- D
Leave it in the cooking pot to cool A deep pot keeps the middle warm for hours, right in the danger zone.
- A
Nothing matches both filters. Clear one of them.
Cooling, the short answers
When does the 6-hour clock start?
When the food drops to 135°F, not when it comes off the heat. A sauce pulled at 190°F starts counting once it reaches 135°F (FDA Food Code 2022, 3-501.14(A)).
Does a blast chiller change the clock?
No. Same limits, 70°F by hour 2 and 41°F by hour 6. Rapid cooling equipment is one of the methods the code lists for meeting them (3-501.15); it just gets there sooner.
Is the cooling rule different in the 2026 Food Code?
No. Cooling isn't among the changes in the FDA's summary of the 2026 edition, and the numbers in 3-501.14 read the same in both editions. The NEHA course is built on the 2022 edition (as of October 2026).