Labor management for refrigerated and frozen warehouses (cold-chain logistics): occupational safety and health, breaks and shifts for cold work

Bottom line first: Work inside refrigerated and frozen warehouses counts as "work handling large amounts of low-temperature objects and work in markedly cold places" (Article 13, paragraph 1, item 3, (ro) of the Ordinance for Enforcement of the Industrial Safety and Health Act), triggering the special-work-category health checkup on reassignment and every six months (Article 45) and a break facility placed outside a markedly cold workplace (Article 614). As work especially harmful to health, cold work caps overtime at 2 hours a day even with an Article 36 agreement (Article 36, paragraph 6, item 1 of the Labor Standards Act; Article 18 of the Enforcement Ordinance). Designing busy-season overtime and variable working hours as if for an ambient-temperature EC warehouse hits this ceiling. The authoritative record lives in the work rules, the labor-management agreement and the safety-and-health framework.

What health risks should you grasp first, in labor terms, for cold work at a refrigerated or frozen warehouse?

Work inside refrigerated (roughly 10°C or below) and frozen (below freezing) warehouses makes cold itself a cause of health harm. Article 22, item 2 of the Industrial Safety and Health Act requires the employer to take measures to prevent "health harm from radiation, high temperature, low temperature, ultrasound, noise, vibration, abnormal air pressure, etc.", with low temperature spelled out as such harm. Blood-pressure swings from sudden temperature differences, mistakes or falls from numb fingers, and frostbite or hypothermia from long exposure are real on-site risks.

The labor starting point is recognizing that the work counts as a "special work category" in law. Work inside a refrigerated or frozen warehouse falls under Article 13, paragraph 1, item 3, (ro) of the Ordinance for Enforcement of the Industrial Safety and Health Act: "work handling large amounts of low-temperature objects and work in markedly cold places." Once in this category, the special-work-category health checkup (every six months) and the overtime ceiling (2 hours a day) pile on—rules an ambient-temperature warehouse does not have. The design of a variable working-hour system and short-time part-timers for an ambient-temperature EC fulfillment center is set out in labor management for logistics warehouses and EC fulfillment centers, but a cold site needs safety and health added on top.

Note that the industrial-safety-and-health laws set no uniform numeric standard for warehouse internal temperature (no "below X°C is prohibited"). The Ordinance on Health Standards in the Office, which sets an effort target for office temperature (18°C or above, 28°C or below), does not apply to the work floor inside a refrigerated or frozen warehouse. That is precisely why the design protects workers not by raising the temperature but by managing exposure time, cold-weather gear, breaks and health management.

How should you design breaks and re-warming the body in a cold environment?

Break time itself follows the ordinary standard of Article 34 of the Labor Standards Act, even for cold work. Where working hours exceed six, give at least 45 minutes; where they exceed eight, at least one hour, during the working hours (Article 34, paragraph 1). Breaks are in principle given all at once (paragraph 2) and must be used freely (paragraph 3). What matters for cold work is "where" the break is taken.

There are two provisions on break facilities, of differing force.

Provision	Content	Nature
Ordinance Article 613	Endeavor to provide a break facility that workers can use effectively	Duty of effort
Ordinance Article 614	At markedly hot, cold or humid workplaces and the like, provide a break facility outside the workplace (except where there is an unavoidable reason, such as underground)	Mandatory

Because the inside of a frozen warehouse is a "markedly cold workplace," placing a break facility inside is not enough; Article 614 requires a separate one in a warm place outside. Write into the work rules and work procedures the practice that, when workers feel numb fingers or dulled movement, they re-warm their bodies at the outside break facility. There is no uniform legal standard for the frequency or length of re-warming, so set it in practice with the advice of the occupational physician and the health officer, given the internal temperature, the work and individual differences. In addition, hot, cold or humid indoor workplaces that pose a risk of harm require temperature-and-humidity adjustment measures such as cooling, heating and ventilation (Ordinance Article 606) and measurement of temperature and humidity every half month (Article 607). Since warming the inside of a freezer is hard to assume, in reality you adjust the temperature and humidity of the anteroom and sorting area and respond by breaking up exposure time.

Where should you watch out, between shift work, the night premium, and the overtime ceiling for cold work?

Cold chains are often sites that run 24 hours, where shift work and night work are unavoidable. Night work (10 p.m. to 5 a.m.) carries a separate night premium of 25% or more of the ordinary wage (Article 37, paragraph 4 of the Labor Standards Act). Because this arises separately from the overtime premium, state the night premium rate and calculation method in the wage rules. The design of shift work itself (rest intervals between shifts, consecutive working days, how shifts are built) is set out in shift work, variable working hours and night work in manufacturing.

What is most easily overlooked in cold work is the overtime ceiling. Article 36, paragraph 6, item 1 of the Labor Standards Act caps the time an Article 36 agreement may extend to 2 hours a day for "underground work and other work especially harmful to health prescribed by Ordinance of the Ministry of Health, Labour and Welfare." Article 18 of the Enforcement Ordinance, which prescribes that "work especially harmful to health," includes "work handling large amounts of low-temperature objects and work in markedly cold places."

Item	Ambient-temperature warehouse work	Cold (refrigerated/frozen) internal work
Daily overtime ceiling	Within the Article 36 agreement (the ordinary upper-limit rule)	Up to 2 hours a day (Article 36, paragraph 6, item 1; Enforcement Ordinance Article 18)
Basis	Labor Standards Act, Article 36	Same Act, Article 36, paragraph 6, item 1; Enforcement Ordinance Article 18

So, busy season or not, you cannot have cold internal work exceed 2 hours of overtime a day. This applies equally to the "overtime" portion beyond the scheduled hours fixed in advance, even where you adopt a variable working-hour system. The crux of this article is that long shifts that an ambient-temperature EC warehouse could build within the ordinary upper-limit rule of an Article 36 agreement hit the 2-hour-a-day frame in cold work. For the basics of how far overtime can go under an Article 36 agreement, see how far overtime can go under an Article 36 agreement. On the heat side (heatstroke), a reporting framework and the like have separately been made mandatory with penalties (the mandatory heatstroke measures).

What must the employer do on cold-weather gear, health checkups and safety-and-health education?

The safety and health of cold work is built up from individual measures. Here they are with their legal bases.

Item	Content	Basis
Supply of cold-weather gear etc.	Measures needed to prevent health harm from low temperature (cold-weather clothing, gloves, cold-weather boots, etc.); replace wet gloves promptly	Industrial Safety and Health Act, Article 22, item 2
Special-work-category health checkup	A health checkup on reassignment and once every six months	Ordinance Article 45 (work under Article 13, paragraph 1, item 3, (ro))
General health checkup	Health checkup at hiring and periodically (once a year or less)	Industrial Safety and Health Act, Article 66
Safety-and-health education	At hiring and on change of work content, educate on cold hazards, cold-weather protection and emergency response	Industrial Safety and Health Act, Article 59
Break facility	Provide a warm break facility outside the workplace	Ordinance Article 614

Especially weighty is the special-work-category health checkup. Because cold work falls under Article 13, paragraph 1, item 3, (ro) of the Ordinance, in addition to the general periodic health checkup (once a year) a health checkup is needed on reassignment and once every six months (Article 45). Part-timers too fall within scope if they are regularly employed and engaged in this special work. Since health checkups and social-insurance coverage tests for short-time workers vary with the actual work, see also the duty to conduct periodic health checkups. In safety-and-health education, as a guard against being locked in (a door closing inside and leaving a worker unable to get out), informing workers of emergency unlocking devices and ways to escape from inside is indispensable. This is a point on which a fatal accident has occurred in the past.

How do you set up busy-season long hours, the Article 36 agreement and the variable working-hour system, and who is in charge?

Using a variable working-hour system for the swings of cold work is possible in itself, but the order of design differs from an ambient-temperature warehouse.

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Document	What to write
Work rules	The cold-work category, start/end times and breaks of each shift (including outside breaks), shift and night work, supply of cold-weather gear, the health-checkup category
Labor-management agreement (variable working hours)	Covered workers, the target period, the hours of each working day. The yearly system is filed with the head of the competent Labor Standards Inspection Office
Article 36 agreement	The limits on overtime and holiday work. Reflect the special 2-hour-a-day ceiling for cold work in the agreement (Enforcement Ordinance Article 18)
Wage rules	The premium rates and calculation methods for overtime, holiday and night work

The key is to build the 2-hour-a-day ceiling for cold work into the Article 36 agreement when you conclude it. Diverting the ambient-temperature template as is makes you illegal the moment you have a worker do more than 2 hours of overtime on site, even if the agreement itself is valid. For choosing a variable working-hour system, see choosing between variable working hours and flextime; for the duty to prepare work rules, see from how many employees are work rules mandatory.

The division of roles splits by the governing law. Preparing and filing the work rules, wage rules, labor-management agreement and Article 36 agreement, the safety-and-health framework (designing the special-work health checkups and education), and the variable working-hour system are handled by a Shakai Hoken Roumushi. Registration of a warehousing business under the Warehousing Business Act, notification of refrigeration equipment under the High Pressure Gas Safety Act, and registration as a Class I fluorocarbon charging and recovery operator under the Act on Rational Use and Proper Management of Fluorocarbons—applications to public agencies—are handled by a Gyoseishoshi. Construction and safety of the refrigeration equipment itself are handled by licensed equipment and electrical contractors (High Pressure Gas Production Safety Manager, electrician, etc.). Suitability of the warehouse premises—zoning, floor load, power and the like—is surveyed and brokered by a real estate transaction agent. Each is contracted separately as an independent business entity, and there is no referral fee. Negotiation or litigation over unpaid premium wages or a breach of the duty of care for safety in an individual case is not handled by a Shakai Hoken Roumushi; we refer you to a lawyer (Bengoshi).

Frequently asked questions

Q. May we have workers inside a frozen warehouse do 3 hours of overtime a day in the busy season?
A. No. Work inside a frozen warehouse counts as work especially harmful to health—"work handling large amounts of low-temperature objects and work in markedly cold places" (Enforcement Ordinance Article 18). For this work, even with an Article 36 agreement, the overtime that may be extended in a day is capped at 2 hours (Article 36, paragraph 6, item 1 of the Labor Standards Act). The 2-hour frame applies even to the portion beyond the scheduled hours fixed in advance under a variable working-hour system. How to count time switched to other work, such as ambient-temperature sorting, varies with the actual work, so individual confirmation is needed.

Q. If we put heaters and a stove inside the warehouse, does that satisfy the break-facility duty?
A. At a markedly cold workplace, providing a break facility "outside" the workplace is the duty under Ordinance Article 614. Placing heaters inside alone does not meet this "outside the workplace" requirement. Since the internal temperature must be kept low for freezing, you provide a warm break facility in an outside anteroom or separate room and have workers re-warm their bodies there. Break time itself follows Article 34 of the Labor Standards Act: at least 45 minutes for over six hours and one hour for over eight, given during the working hours.

Q. Do cold-work part-timers also need the six-monthly health checkup?
A. If they are regularly employed and engaged in work inside a refrigerated or frozen warehouse (the special work under Article 13, paragraph 1, item 3, (ro)), a special-work-category health checkup is needed on reassignment and once every six months (Ordinance Article 45). This turns not on employment form but on the work engaged in. Together with the scope of workers subject to the general periodic health checkup (once a year), short-time workers are judged individually by actual working hours and continuity of use.

Q. Can the labor matters of a frozen warehouse and the licensing of refrigeration equipment and the warehousing business be entrusted to the same office?
A. The professionals in charge differ. Preparing and filing the work rules, Article 36 agreement, wage rules and labor-management agreement, and designing the safety-and-health framework and variable working-hour system for cold work, are the work of a Shakai Hoken Roumushi. Registration of a warehousing business under the Warehousing Business Act and notification/registration under the High Pressure Gas Safety Act and the Act on Rational Use and Proper Management of Fluorocarbons are the work of a Gyoseishoshi; a Shakai Hoken Roumushi cannot prepare these documents submitted to public agencies. Construction and safety of refrigeration equipment are handled by licensed equipment and electrical contractors, and survey and brokerage of warehouse premises by a real estate transaction agent. Each is contracted separately as an independent business entity, and there is no referral fee.

Basis for this article

• Industrial Safety and Health Act (Act No. 57 of 1972), Article 22, item 2 — the employer must take measures needed to prevent health harm from radiation, high temperature, low temperature, ultrasound, noise, vibration, abnormal air pressure, etc.
• Ordinance for Enforcement of the Industrial Safety and Health Act, Article 13, paragraph 1, item 3, (ro) — lists "work handling large amounts of low-temperature objects and work in markedly cold places" as one of the special work categories
• Ordinance Article 45 — a periodic health checkup for workers regularly engaged in work under Article 13, paragraph 1, item 3, on reassignment and once every six months (the special-work-category health checkup)
• Industrial Safety and Health Act, Article 66 — the employer conducts health checkups by a physician (the general health checkup at hiring and periodically). Article 59 — safety-and-health education at hiring and on change of work content
• Ordinance Article 613 — endeavor to provide a break facility (duty of effort). Article 614 — at markedly hot, cold or humid workplaces and other harmful workplaces, provide a break facility outside the workplace (except where there is an unavoidable reason, such as underground)
• Ordinance Article 606 — for hot, cold or humid indoor workplaces that pose a risk of harm, take temperature-and-humidity adjustment measures such as cooling, heating and ventilation. Article 607 — measure the temperature and humidity (and radiant heat for the hot categories) of the indoor workplaces under Article 587 once every half month
• Labor Standards Act (Act No. 49 of 1947), Article 34 — where working hours exceed six, at least 45 minutes; where they exceed eight, at least one hour of break during the working hours, all at once, for free use
• Labor Standards Act, Article 36, paragraph 6, item 1 — for underground work and other work especially harmful to health prescribed by Ordinance, daily overtime must not exceed 2 hours. Enforcement Ordinance Article 18 — the "work especially harmful to health" includes "work handling large amounts of low-temperature objects and work in markedly cold places"
• Labor Standards Act, Article 37, paragraph 4 — a night premium of 25% or more of the ordinary wage for night work between 10 p.m. and 5 a.m.
• Warehousing Business Act (Act No. 121 of 1956), Article 3 — operating a warehousing business requires registration with the Minister of Land, Infrastructure, Transport and Tourism. Notification/registration under the High Pressure Gas Safety Act and the Act on Rational Use and Proper Management of Fluorocarbons is separate (details are in the Gyoseishoshi's field)
• Statutory provisions checked on e-Gov Law Search on 3 November 2026. The break frequency and re-warming time for cold work, concrete work management by internal temperature, the individual judgment on whether the special work applies, and the scope of short-time workers subject to health checkups must be confirmed for each site with the occupational physician, the health officer and a qualified professional (where the law sets no uniform numeric standard, no definitive value is shown, treated as unverified)

This article does not determine whether any particular case qualifies. 四葉社会保険労務士事務所 can advise on preparing and filing the work rules, wage rules, labor-management agreement and Article 36 agreement for cold work at refrigerated and frozen warehouses (cold-chain logistics centers), on building the safety-and-health framework including the special-work-category health checkups and education, and on designing shift work, night work and the variable working-hour system. Registration of a warehousing business under the Warehousing Business Act and notification/registration under the High Pressure Gas Safety Act and the Act on Rational Use and Proper Management of Fluorocarbons are referred to a Gyoseishoshi; construction and safety of refrigeration equipment to a licensed equipment and electrical contractor; survey and brokerage of warehouse premises to a real estate transaction agent; and a dispute over unpaid premium wages or the duty of care for safety to a lawyer (Bengoshi). Where a different professional is needed, each is contracted separately as an independent business entity, and there is no referral fee. Fees are set out in the fee schedule, and frequently asked questions in the FAQ.

This article is general information. Individual determinations are made by a qualified professional after a consultation, in light of individual circumstances. Written by Joji Uramatsu (Shakai Hoken Roumushi, Gyoseishoshi, Registered Real Estate Transaction Specialist).