There is no single temperature at which the Occupational Safety and Health Administration says outdoor work must stop. OSHA has no cold-specific standard. Instead, employers must protect workers from cold stress under the General Duty Clause of the OSH Act, and the widely referenced work/warm-up schedule from the American Conference of Governmental Industrial Hygienists calls for non-emergency outdoor work to end at wind chills around -25°F with a 20 mph wind, and unconditionally at -45°F or below.1Occupational Safety and Health Administration. Wind Chill Table Whether your own worksite has crossed the line depends on air temperature, wind, moisture, workload, and what protection your employer has put in place.
Why Wind Chill Matters More Than the Thermometer
The reading on the thermometer is only half the story. Wind chill describes how cold your body actually feels once wind starts pulling heat off your skin. At 40°F with a 35 mph wind, the effective temperature on exposed skin drops to about 28°F.2National Weather Service. Wind Chill Chart That gap is where many cold injuries happen, because workers judge the danger from the air temperature alone.
Frostbite risk climbs fast as wind chill drops. At a wind chill near -19°F, exposed skin can freeze in about 30 minutes. At lower wind chills, frostbite can develop in 10 minutes or even 5.3National Weather Service. Wind Chill Temperature Index Wet skin or wet clothing shrinks those times further. Sweat-soaked clothing conducts heat away from the body far faster than dry clothing, which is why workers doing heavy labor are at real risk during the pause after exertion. Sedentary work creates the opposite problem: less internal heat, faster chilling, even at moderate temperatures.
The Wind Chill Thresholds Where Work Should Stop
The most concrete guidance on when to keep working, when to break, and when to stop comes from the ACGIH work/warm-up schedule, which OSHA publishes in its own reference materials. It pairs air temperature with wind speed to set both the length of work periods and the point at which non-emergency outdoor work should cease.1Occupational Safety and Health Administration. Wind Chill Table
Assuming moderate to heavy work in a four-hour shift with ten-minute warm-up breaks, the schedule looks roughly like this at key thresholds:
- -15°F to -19°F with no significant wind: normal work schedule with standard breaks.
- -15°F to -19°F with a 20 mph wind: maximum 55 minutes of work before a warm-up break, with three breaks in the four-hour period.
- -25°F to -29°F with a 20 mph wind: non-emergency outdoor work should stop.
- -35°F to -39°F with a 10 mph wind or more: non-emergency outdoor work should stop.
- -45°F or below in any wind: non-emergency outdoor work should stop regardless of conditions.1Occupational Safety and Health Administration. Wind Chill Table
These thresholds assume moderate to heavy physical work, adequate clothing, and access to heated warm-up shelters. Lighter or sedentary tasks generate less body heat, so the same numbers carry more risk. Without proper shelter and gear, the danger thresholds effectively move upward, meaning conditions that appear survivable on the chart can be unsafe in practice.
What OSHA Requires of Employers in the Cold
Because OSHA has no standalone cold-work regulation, enforcement runs through the General Duty Clause, which requires every employer to provide a workplace “free from recognized hazards that are causing or are likely to cause death or serious physical harm.”4Office of the Law Revision Counsel. 29 USC 654 – Duties of Employers and Employees Cold stress is a recognized hazard, so an employer who ignores extreme cold can be cited even without a cold-specific standard on the books.5Occupational Safety and Health Administration. Winter Weather – Cold Stress
The penalties are meaningful. As of 2025, a Serious violation can bring fines up to $16,550 per violation, and a Willful or Repeated violation up to $165,514 per violation. These amounts are adjusted annually for inflation.6Occupational Safety and Health Administration. OSHA Penalties
OSHA’s cold stress guidance describes what employers should be doing to control the hazard: frequent breaks in heated shelters, scheduling heavy work during the warmer part of the day, rotating workers to limit individual exposure, using a buddy system so partners can spot symptoms in each other, and training workers to recognize cold stress and give basic first aid.7Occupational Safety and Health Administration. Cold Stress Guide Where practical, employers should also use engineering controls like radiant heaters, windbreaks, and temporary enclosures at outdoor workstations.
One point trips up a lot of workers: federal OSHA does not require your employer to pay for ordinary winter weather clothing. Under 29 CFR 1910.132, items “used solely for protection from weather, such as winter coats, jackets, gloves, parkas, rubber boots, hats, raincoats” are explicitly excluded from the employer’s PPE payment obligation.8eCFR. 29 CFR 1910.132 – General Requirements OSHA confirms this on its winter preparedness page.9Occupational Safety and Health Administration. Winter Weather – Preparedness Specialized PPE required by a separate OSHA standard, like a fall protection harness, is still the employer’s responsibility.
The General Duty Clause still applies, though. An employer who sends workers out in dangerously cold conditions without confirming they have adequate clothing can be cited for failing to address the hazard, even if the employer had no obligation to buy the coat.
Some states go further than federal OSHA. Minnesota’s occupational safety agency requires employers to maintain minimum workplace air temperatures, and Washington uses a general extreme-temperature rule to protect workers. If you work in a state with its own OSHA-approved plan, check whether it has adopted cold-specific protections beyond the federal baseline.
Your Rights If Conditions Get Dangerous
You have three separate channels for pushing back when cold conditions cross the line.
Filing an OSHA Complaint
You can report unsafe cold working conditions to OSHA online, by phone at 800-321-6742, by fax or mail, or by visiting a local OSHA office. A signed complaint is more likely to lead to an on-site inspection. File as soon as you notice the hazard, because OSHA generally cannot issue violations for conditions that occurred more than six months earlier.10Occupational Safety and Health Administration. File a Complaint
Refusing Dangerous Work
In limited circumstances you have the legal right to refuse a work assignment because of extreme cold. All four of these conditions must be met:
- Where possible, you asked your employer to eliminate the danger and the employer failed to do so.
- You genuinely believe an imminent danger of death or serious injury exists.
- A reasonable person would agree the danger is real.
- The hazard is too urgent to wait for normal OSHA enforcement.11Occupational Safety and Health Administration. Workers’ Right to Refuse Dangerous Work
If you do refuse, stay at the worksite unless your employer tells you to leave. Walking off without following these steps can weaken your legal protection.
Protection Against Retaliation
Section 11(c) of the OSH Act prohibits employers from firing, demoting, or otherwise retaliating against workers who file complaints, report hazards, or exercise any right under the Act.12Occupational Safety and Health Administration. 1977.3 – General Requirements of Section 11(c) of the Act If your employer retaliates, you must file a whistleblower complaint with OSHA within 30 days of the adverse action. That deadline is strict. Complaints can be made by phone, in writing, online, or in person at any OSHA office, but they cannot be filed anonymously.13Occupational Safety and Health Administration. OSHA Online Whistleblower Complaint Form
Cold Injuries to Watch For
Cold injuries develop quietly, and the affected worker is often the last person to notice. Knowing the early signs matters because your own judgment is one of the first things to slip.
Hypothermia sets in when core body temperature drops below 95°F. Mild hypothermia (90–95°F) brings shivering, fatigue, nausea, and impaired judgment. In the moderate range (82–90°F), shivering typically stops, lethargy grows, and the heart becomes susceptible to irregular rhythms. Below 82°F, severe hypothermia can cause loss of consciousness, very slow breathing, and cardiac arrest.14StatPearls – NCBI Bookshelf. Hypothermia If you suspect hypothermia in a coworker, call 911.
Frostbite moves through stages. Frostnip causes redness, tingling, and numbness in exposed skin. Superficial frostbite turns skin pale or bluish, and painful blisters typically appear 12 to 36 hours after rewarming. Deep frostbite turns skin bluish-gray, forms large blisters within a day or two, and can destroy underlying tissue.15UCHealth. Frostbite Fingers, toes, ears, and the nose go first. If there is any chance the skin could refreeze before medical care, leave it frozen; refreezing after thawing does far more damage than the original injury.
Trench foot does not require freezing temperatures. It can develop when feet stay wet and cold for extended periods, even at temperatures as high as 60°F. Most cases involve one to three days of exposure, though it can begin in as little as 10 to 14 hours. Early symptoms are tingling, itching, and numbness, followed by swelling and skin discoloration; severe cases produce blisters and open sores.16Cleveland Clinic. Trench Foot Workers spending long shifts in wet boots are the primary risk group.
Tingling, numbness, unusual fatigue, or trouble thinking clearly are the alarms. Tell someone the moment they show up. The buddy system exists because the person sliding into cold stress is usually the last to see it.