3.2 Time & Temperature Control
Key Takeaways
- The temperature danger zone is 41 to 135 degrees F; TCS food may spend no more than 4 cumulative hours there.
- Minimum internal cook temperatures: poultry 165, ground meat 155, seafood and shell eggs for immediate service 145, whole roasts 145.
- Hold hot food at 135 degrees F or above and cold food at 41 degrees F or below.
- Two-stage cooling: 135 to 70 degrees F within 2 hours, then 70 to 41 degrees F within a total of 6 hours.
- Reheat previously cooked TCS food to 165 degrees F within 2 hours before hot holding.
The Temperature Danger Zone
The temperature danger zone is 41 degrees F to 135 degrees F. Pathogens multiply fastest in this range, and a TCS food may spend no more than 4 cumulative hours in it before it must be discarded - the count includes prep, transport, and service, not just one stretch. The goal of every procedure below is to move food through this zone quickly or keep it out entirely.
Minimum Internal Cooking Temperatures
Cooking destroys pathogens when food reaches a minimum internal temperature for a set time, measured with a calibrated thermometer in the thickest part. Memorize this ladder - the exam tests it directly.
| Food | Minimum internal temp |
|---|---|
| Poultry, stuffing, stuffed meats, reheated TCS | 165 degrees F for 15 seconds |
| Ground meat, ground seafood, shell eggs held for service | 155 degrees F for 17 seconds |
| Seafood, steaks/chops, shell eggs cooked to order | 145 degrees F for 15 seconds |
| Whole roasts (beef, pork, veal, lamb) | 145 degrees F for 4 minutes |
| Fruit, vegetables, grains, legumes for hot holding | 135 degrees F |
The pattern: the more a food is ground, chopped, or stuffed, the more interior surface area is exposed to bacteria, so it needs a higher temperature. Whole roasts allow a lower 145 degrees F because they hold it longer (4 minutes).
Holding: Keep It Hot or Keep It Cold
Once cooked, TCS food must be held out of the danger zone:
- Hot holding: 135 degrees F or above
- Cold holding: 41 degrees F or below
Receiving cold TCS deliveries follows the same 41 degrees F or below rule - reject a shipment that arrives warmer.
Two-Stage Cooling
Cooling is where most violations happen, because hot batches linger in the danger zone. The FDA Food Code requires two-stage cooling:
- Stage 1: 135 degrees F down to 70 degrees F within 2 hours
- Stage 2: 70 degrees F down to 41 degrees F within a total of 6 hours
Stage 1 is the critical one. If food has not reached 70 degrees F within the first 2 hours, it must be reheated and cooled again, or discarded. Speed cooling with shallow pans, an ice-water bath, ice paddles, or a blast chiller.
Reheating for Hot Holding
Previously cooked and cooled TCS food being reheated for hot holding must reach 165 degrees F for 15 seconds within 2 hours. Reheating only to the 135 degrees F holding temperature is not adequate - the food must hit 165 degrees F to be safe, then it may be held at 135 degrees F.
Thawing and Thermometer Calibration
Thaw TCS food safely: in a cooler at 41 degrees F or below, under running water at 70 degrees F or below, in a microwave if cooked immediately, or as part of the cooking process. Calibrate a probe thermometer in an ice-water bath at 32 degrees F or with the boiling-point method.
A cook removes a large batch of chili from the steam table at 135 degrees F at 2:00 p.m. to cool it. By 4:00 p.m. it has only reached 90 degrees F. What is the correct action under the FDA Food Code?
Which item must reach the HIGHEST minimum internal cooking temperature?
Leftover cooked rice from yesterday is being reheated to hold on the lunch line. To what temperature and within what time must it be reheated?