Home › Commercial Refrigeration Guide › Walk-In Cooler & Freezer Guide › My Walk-In Hit 45°F: Is the Food Safe?
Updated October 14, 2026
Quick answer
It depends on how hot the food got and for how long. Emergency guidance used by many health departments lets refrigerated TCS food that reached no more than 45°F be kept if it is back at 41°F or below within 4 hours; food above 41°F after 4 hours is discarded. Without a time and temperature record, assume it is unsafe. Your local health department has the final word.
First 15 minutes
- Write down the time you noticed and the air and product temperatures.
- Keep the door closed except to move product.
- Probe several items: near the door, on top shelves, and dense items like meat and dairy.
- Move the highest-risk TCS food (raw meat, seafood, dairy, cut produce, cooked food) to another cold unit or onto ice.
- Call your refrigeration service company and describe the symptoms.
Speed matters because the 4-hour clock starts when food passed 41°F, not when someone noticed.
The time and temperature rule
Many state and county programs base their power-outage and equipment-failure guidance on the Conference for Food Protection's Emergency Action Plan for Retail Food Establishments. In plain terms:
- TCS food at 41°F or below is fine.
- TCS food that reached 45°F or less can be kept if it returns to 41°F or below within 4 hours of passing 41°F.
- TCS food still above 41°F at the 4-hour mark should be cooked right away or discarded, per your local program.
- If you cannot show when food passed 41°F, treat it as unsafe.
Some California counties are stricter. Sacramento County, for example, tells retail food facilities to discard potentially hazardous food that has been between 41°F and 135°F for more than 4 hours, and to close if power is out for more than an hour without backup. Check your own county's guidance; Bay Area counties each run their own program.
What usually does not need to be discarded
Whole produce, many condiments, sealed beverages, hard cheeses and bread are not TCS food or are lower risk. Quality may suffer, but the 4-hour rule is aimed at TCS food. When unsure, ask your health inspector rather than guessing.
Why the walk-in warmed up
The most common causes are a door left open, a failed evaporator fan motor, an iced-up coil, a dirty or failed condenser, a tripped breaker, and refrigerant leaks. Use our symptom pages to narrow it down:
- Walk-in cooler not cooling
- Evaporator fans not running
- Evaporator coil iced up
- Walk-in tripping the breaker
- Power outage playbook
Prevent the next one
- Fit a wireless temperature alarm that texts you overnight.
- Keep a written emergency plan: who to call, where to move product, how much ice to buy.
- Log temperatures twice a day so you always have a record.
- Book preventive maintenance; most warm-box calls trace back to dirty coils, worn fan motors and failing door parts. See the maintenance checklist.
A decision table
| Product temperature | Time above 41°F | Typical action under widely used emergency guidance |
|---|---|---|
| 41°F or below | n/a | Keep |
| 42–45°F | Under 4 hours, back to 41°F | Keep, if documented |
| 42–45°F | 4 hours or more | Cook immediately or discard |
| Above 45°F | Any | Check your local program; often stricter limits |
| Unknown | Unknown | Treat as unsafe |
This summarizes general emergency guidance; your local health department may be stricter.
Records to keep
- Time the problem was discovered and readings taken.
- What product was moved, kept or discarded.
- Service call time and repair details.
- Time the box returned to temperature.
These records protect you with inspectors and insurers.
Why the 4-hour clock matters
Bacteria grow faster as food warms through the temperature danger zone. Cold-holding at 41°F or below slows growth; time limits cap how long food can be exposed. That is why the rules focus on both temperature and time, and why records matter. Without a record of when food passed 41°F, nobody can show it stayed within the limit, so the safe assumption is that it did not. A wireless temperature monitor gives you that record automatically, including overnight.
Owner checks while you wait for service
- Keep doors shut.
- Probe product every 30 minutes and log it.
- Move the highest-risk food first.
- Check whether the evaporator fans run and the condensing unit runs; tell the technician.
Bay Area note
Santa Clara, San Mateo, Alameda and San Francisco counties each run their own food programs. Keep your county's guidance on hand.
When to call a technician
Call right away if the box is above 41°F and not recovering. The faster the system is fixed, the more product stays inside the 4-hour window.
Open 7 days, 8 AM to 5 PM, with emergency service until 9 PM. CA Lic. #776244.
Frequently asked questions
How long can food stay in a warm walk-in?
Under widely used emergency guidance, TCS food can be held up to 4 hours after passing 41°F if it never went above 45°F and is back at 41°F or below by then. Local rules can be stricter.
Do I have to throw everything away?
No. Non-TCS items such as sealed drinks, whole produce and many condiments are usually fine. TCS food is judged by temperature and time.
Can I cool food back down and keep it?
Only if it stayed within the time and temperature limits above. Re-chilling does not make unsafe food safe.
Who decides if food must be discarded?
Your local environmental health department. Call them if you are unsure; they would rather advise you than find unsafe food later.
Can I serve food that was at 45°F for two hours?
Under widely used guidance, if it is back at 41°F or below within 4 hours of passing 41°F and you have records; check local rules.
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