What is a HACCP temperature log?

A HACCP temperature log is the written record that a temperature critical control point stayed within its safe limits — the date, time, unit, the reading, whether it was in range, and any corrective action taken if it was not. Under a HACCP plan, monitoring a critical limit is only half the job; recording it, and being able to show the record, is what demonstrates control to an auditor or inspector.

How often do you have to log temperatures for HACCP?

Your HACCP plan sets the frequency, based on the hazard. Cold-holding and freezer units are commonly checked at the start of each shift and every few hours; cooking and cooling steps are logged per batch against their time-temperature limits. The rule of thumb is often enough that a deviation is caught before product is at risk. Continuous electronic monitoring satisfies this with a reading every few minutes and removes the "we forgot the 2 p.m. check" gap.

What is a corrective action on a temperature log?

A corrective action is what you did when a reading was out of range: adjusted or repaired the unit, moved product, discarded product, and re-checked. HACCP requires that deviations are not just noticed but acted on and documented — an inspector looks for the deviation, the action, and the follow-up reading together. A blank corrective-action column that is never filled in is a red flag; an out-of-range reading with a documented action is a system working as intended.

Is a paper log good enough?

A paper log is acceptable and still common, but it has known weaknesses: gaps when someone is busy, readings taken late and back-filled, illegible or lost sheets, and no record of what happened overnight. Auditors know these patterns. Continuous electronic logging closes the gaps, timestamps every reading, and keeps a tamper-resistant history — which is why many operations keep the paper template as a backup and move primary monitoring to a sensor.

Does LoopString make my operation HACCP compliant?

No tool makes you compliant — compliance is your HACCP plan, your critical limits, and your practices. What LoopString does is record compliance-grade temperature history automatically: continuous readings, threshold alerts when a unit drifts, a tamper-resistant activity log, and HACCP/FDA/USDA-style PDF reports you can hand to an inspector. It replaces the paper log and the missed checks, not the plan.

HACCP Temperature Log

A free printable log template and a plain-English guide to what HACCP temperature monitoring actually requires — log frequency, corrective actions, and when paper stops being enough.

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The template

Date	Time	Unit / Location	Target range	Temp reading	In range? (Y/N)	Corrective action	Initials

Key Takeaways

A HACCP temperature log records that a temperature critical control point stayed in its safe limits: date, time, unit, reading, in-range, corrective action, initials.
Log frequency is set by your HACCP plan — commonly start-of-shift plus every few hours for cold holding, per-batch for cook/cool steps.
A corrective action (what you did when out of range, and the re-check) is required, not optional — a blank corrective-action column is an audit red flag.
Paper logs are accepted but gap-prone; continuous electronic monitoring timestamps every reading and closes the overnight/forgot-the-check gaps.

What a HACCP temperature log has to show

Monitoring a critical limit only counts if you can show it. An inspector reading your log is looking for three things together: that readings were taken at the required frequency, that each reading was inside the critical limit, and that any reading outside it has a documented corrective action and a follow-up reading. The columns in the template above exist for exactly that story — a reading, a yes/no, and what you did about a no.

Where paper logs fail an audit

The failure modes are predictable: the 2 a.m. check nobody took, a run of identical readings that were clearly back-filled, a sheet that went through the wash. None of these mean the food was unsafe, but all of them undermine the record that is supposed to prove it was. This is the case for continuous electronic monitoring — not because paper is disallowed, but because a sensor does not forget, does not round, and does not lose the sheet.

From a template to an automatic record

A template is a good backup and a fine place to start. But the honest end state is not filling in a grid by hand — it is a sensor on each unit recording continuously, an alert when one drifts out of range so the corrective action happens now instead of at the next check, and a tamper-resistant history you can export. That is what LoopString does: it does not make you compliant — your plan does that — but it records compliance-grade temperature history automatically and produces HACCP/FDA/USDA-style reports for the inspector. See also the temperature mapping guide for validating where to place those sensors.

Stop keeping paper logs

LoopString records compliance-grade temperature history automatically, alerts on drift, and exports HACCP/FDA/USDA-style reports.

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Frequently Asked Questions

What is a HACCP temperature log?: A HACCP temperature log is the written record that a temperature critical control point stayed within its safe limits — the date, time, unit, the reading, whether it was in range, and any corrective action taken if it was not. Under a HACCP plan, monitoring a critical limit is only half the job; recording it, and being able to show the record, is what demonstrates control to an auditor or inspector.
How often do you have to log temperatures for HACCP?: Your HACCP plan sets the frequency, based on the hazard. Cold-holding and freezer units are commonly checked at the start of each shift and every few hours; cooking and cooling steps are logged per batch against their time-temperature limits. The rule of thumb is often enough that a deviation is caught before product is at risk. Continuous electronic monitoring satisfies this with a reading every few minutes and removes the "we forgot the 2 p.m. check" gap.
What is a corrective action on a temperature log?: A corrective action is what you did when a reading was out of range: adjusted or repaired the unit, moved product, discarded product, and re-checked. HACCP requires that deviations are not just noticed but acted on and documented — an inspector looks for the deviation, the action, and the follow-up reading together. A blank corrective-action column that is never filled in is a red flag; an out-of-range reading with a documented action is a system working as intended.
Is a paper log good enough?: A paper log is acceptable and still common, but it has known weaknesses: gaps when someone is busy, readings taken late and back-filled, illegible or lost sheets, and no record of what happened overnight. Auditors know these patterns. Continuous electronic logging closes the gaps, timestamps every reading, and keeps a tamper-resistant history — which is why many operations keep the paper template as a backup and move primary monitoring to a sensor.
Does LoopString make my operation HACCP compliant?: No tool makes you compliant — compliance is your HACCP plan, your critical limits, and your practices. What LoopString does is record compliance-grade temperature history automatically: continuous readings, threshold alerts when a unit drifts, a tamper-resistant activity log, and HACCP/FDA/USDA-style PDF reports you can hand to an inspector. It replaces the paper log and the missed checks, not the plan.