--- title: "Cold Stress at Work: Signs, Prevention and Crew Plan" description: "Cold stress hits outdoor and unheated crews fast. Learn the four cold illnesses, employer steps from NIOSH, and a simple winter plan for your jobsite." url: https://jmarsolutions.multisites.ai/guides/cold-stress-at-work publisher: JMAR Solutions phone: +1-214-632-7780 quote: https://jmarsolutions.multisites.ai/contact --- Field guide # Cold stress at work: spot it early, plan for it Cold stress happens when cold air, wind or wet conditions pull heat from the body faster than it can make heat. NIOSH lists four cold-related illnesses: hypothermia, frostbite, trench foot and chilblains. Employers cut the risk with warm break areas, warm liquids, layered clothing, relief workers, training and close monitoring of at-risk crew. Updated November 5, 20267 min read ## Four cold illnesses NIOSH names hypothermia, frostbite, trench foot and chilblains. ## Warm area and warm liquids NIOSH tells employers to provide warm break areas and warm liquids. ## Near freezing can be enough In regions not used to winter weather, near freezing temperatures can cause cold stress. ## Hydrate in winter too Cold weather lowers thirst, so crews need a plan to drink. ## What is cold stress at work? Cold stress is the strain on the body when it loses heat faster than it can make it. NIOSH says that when temperatures drop below normal, heat can rapidly leave your body. Cold, wind and wet clothing all speed that loss. The result can be a cold-related illness. NIOSH lists outdoor workers, workers in poorly insulated or unheated areas, and workers in areas without shelter as people who may be at risk. That covers concrete crews on a January pour, roofers, utility crews, loaders on an open dock and warehouse teams in unheated buildings. Cold stress also depends on place. NIOSH says what counts as cold stress varies across the country. In regions unaccustomed to winter weather, near freezing temperatures are considered factors for cold stress. A Texas crew can get hurt at temperatures a northern crew would call mild. See [cold stress](https://jmarsolutions.multisites.ai/glossary/cold-stress) in the glossary. ## What are the four cold-related illnesses? NIOSH names four: hypothermia, frostbite, trench foot and chilblains. Hypothermia is a drop in core body temperature. Frostbite is freezing of skin and the tissue under it. Trench foot comes from long contact with wet, cold conditions. Chilblains are painful skin reactions to cold. The table below is a field card for supervisors. It gives plain meanings and a site action. It is not a diagnosis. Ask your site medical provider to add symptom detail and first aid steps for your crew. Illness Plain meaning Supervisor action [Hypothermia](https://jmarsolutions.multisites.ai/glossary/hypothermia) The body loses heat faster than it makes heat Move the worker to a warm area and get medical help [Frostbite](https://jmarsolutions.multisites.ai/glossary/frostbite) Cold injury to skin and tissue, often in ears, nose, fingers and toes Get the worker indoors and get medical help Trench foot Foot injury from long cold, wet exposure Replace wet boots and socks, report it Chilblains Painful skin reaction to cold Warm the worker gradually, report it When a worker looks confused, cannot stop shaking or cannot work normally, treat it as urgent and call 911. ## How can employers reduce cold stress risk? Employers cut cold stress by changing the work and the setting before the cold arrives. NIOSH steps include scheduling cold jobs for warmer times, using relief workers, providing warm liquids and warm break areas, limiting time outside, monitoring at-risk workers and training. Here is the NIOSH employer list, turned into a plan you can post: 1. Schedule cold jobs for warmer months or the warmer part of the day. 2. Use relief workers or assign extra workers for long jobs. 3. Provide warm liquids to workers. 4. Provide warm areas for use during breaks. 5. Limit the amount of time outside on extremely cold days. 6. Monitor workers who are at risk of cold stress. 7. Provide cold stress training. Put numbers on step 5 for your site. Set a warm-up break length and a trigger, such as a forecast low or wind speed, that starts it. Write the trigger down in your heat illness prevention plan or winter plan so every foreman applies it the same way. ## What should workers wear and carry? Workers should dress in layers, protect ears, face, hands and feet, and carry spares. NIOSH advises several layers of loose clothing for better insulation, waterproof and insulated boots, and a hat. Some clothing can restrict movement, which can be dangerous around equipment. Add these items to the truck or the cart: - Extra socks, gloves, a hat, a jacket and blankets, as NIOSH suggests - A thermometer and chemical hot packs in the first aid kit - A rule to avoid touching cold metal surfaces with bare skin - A buddy system so each worker watches one other worker Wet is worse than cold. Dry socks matter on a rainy day more than a thicker jacket does. ## Do crews still need to hydrate in the cold? Yes. Cold work still uses water, and people tend to drink less when they are not hot. JMAR’s winter hydration post says cold weather decreases the thirst sensation, so it is important to have systems that encourage drinking. It also says chilly dry air raises the water vapor we lose by breathing. Treat those as JMAR’s statements. They match a common field problem: nobody feels thirsty in a parka. Build drinking into the day instead of waiting for thirst. - Put a marked water bottle in each crew member’s hand at the start of the shift. - Pair every warm-up break with a drink break. - Offer warm liquids, as NIOSH recommends. - Check that water stations do not freeze. JMAR’s post also suggests adding concentrated electrolytes to daily water. Rapid Restoration Drops are a dietary supplement that replace electrolytes lost in sweat and support hydration. Read [the winter hydration post](https://jmarsolutions.multisites.ai/winter-hydration-tips-rapid-rehydration-drops) for JMAR’s full text. Cold stress illnesses need warming and medical care, not a supplement. For the basics of [hydration](https://jmarsolutions.multisites.ai/glossary/hydration) and electrolytes, see our other guides. ## What should a cold stress talk cover? NIOSH says cold stress training should cover worker risk, prevention, symptoms, monitoring yourself and coworkers, treatment and personal protective equipment. Keep the talk short and local. Name your warm-up shelter, who holds the spare gloves, and who calls 911. Run it as a five-minute toolbox talk before the first cold snap. Our [heat toolbox talk script](https://jmarsolutions.multisites.ai/guides/heat-toolbox-talk) uses the same format. Swap the heat signs for the cold signs in the table above. ## Is there an OSHA rule for cold stress? We did not find a standalone federal OSHA cold stress standard on the pages we reviewed. NIOSH links to OSHA’s Cold Stress Guide and Winter Weather resources. OSHA’s General Duty Clause covers recognized hazards in general. This guide is not legal advice. For heat, see [OSHA heat rules](https://jmarsolutions.multisites.ai/osha-heat-rules). Talk to your safety professional or OSHA’s free On-Site Consultation program about winter planning. ## How does the plan change by site type? The risk and the fix differ for an open pour, a loading dock and an unheated warehouse. Start from the NIOSH employer list, then match each step to the place. The table shows one way to do it. Adjust it with your safety team and your site’s medical provider. Site type Main exposure Plan items from the NIOSH list Open outdoor work (concrete, roofing, utilities) Wind, wet, long time outside Schedule jobs for the warmer part of the day, relief workers, warm break area, limit time outside Loading dock or yard Open doors, wind, cold metal Warm area for breaks, extra layers, no bare skin on cold metal, monitor at-risk workers Unheated or poorly insulated building Steady cold with no shelter Warm break area, warm liquids, monitoring, training Wet work (washdown, rain, snowmelt) Wet clothing and wet feet Waterproof, insulated boots, spare socks, spare clothes NIOSH names workers in poorly insulated or unheated areas and workers in areas without shelter as people who may be at risk. A warehouse crew is not safe just because the roof is on. ## What mistakes do crews make in cold weather? Most mistakes come from treating cold as a comfort issue. Four show up often. Each has a simple fix drawn from the NIOSH list. - **Waiting for the worker to speak up.** Workers may not speak up. Use a buddy system and a foreman check instead of relying on self-reports. - **No place to warm up.** A truck cab with one seat is not a plan. NIOSH tells employers to provide warm areas for use during breaks. - **Too many tight layers.** NIOSH says to wear several layers of loose clothing for better insulation. It also notes that some clothing may restrict movement, which could be dangerous around moving equipment. - **Wet gear.** Carry spare socks, gloves, a hat and a jacket, as NIOSH suggests. Put one line from this list into each morning briefing. Rotate the line each week so crews do not tune out. ## What should a winter checklist include? A winter checklist turns the plan into a daily habit. Foremen run it in two minutes before work starts. Keep it on the same sheet as your heat checklist so the habit carries across seasons. 1. Forecast checked, including wind and wet conditions. 2. Warm break area open, stocked and reachable. 3. Warm liquids available. 4. Spare socks, gloves, hats and jackets on hand. 5. First aid kit includes a thermometer and chemical hot packs. 6. Relief workers assigned for long jobs. 7. At-risk workers named and being watched. 8. 911 caller named for the shift. Review the sheet weekly. If a line is blank three days in a row, fix the cause, not the paperwork. ## Next step Want a winter hydration plan and a toolbox talk for your crew? [Book a 15-minute demo](https://calendly.com/jen-jmarsolutions/15-min-meeting) or ask for a [free sample](https://jmarsolutions.multisites.ai/free-sample). See also [heat stress prevention](https://jmarsolutions.multisites.ai/heat-stress-prevention) and our [hydration programs](https://jmarsolutions.multisites.ai/hydration-programs). ## Frequently asked questions ### What temperature causes cold stress? There is no single number. NIOSH says what counts as cold stress varies across the country. In regions unaccustomed to winter weather, near freezing temperatures are factors for cold stress. Wind, wet clothing and long exposure make it worse, so plan by conditions, not by one reading. ### What should a supervisor do when a worker seems affected by cold? Move the worker to a warm area, replace wet clothing, stay with the worker and get medical help. Call 911 if the worker is confused or cannot work normally. Your site medical provider should set the exact first aid steps, and the crew should train on them before winter. ### Do workers still need to drink water in cold weather? Yes. JMAR's winter hydration post says cold weather decreases the thirst sensation, so crews need a system that prompts them to drink. A marked bottle and a scheduled warm-up break are simple options. Do not rely on thirst alone, and ask your safety team for site rules. ### What should a cold stress training cover? NIOSH says training should cover worker risk, prevention, symptoms, monitoring yourself and coworkers, treatment and personal protective equipment. Add your own site rules for warm-up shelters, relief workers and who calls 911. Hold the training before the first cold snap, and repeat it for new hires. ### Is there an OSHA cold stress rule? We did not find a standalone federal OSHA cold stress standard on the pages we reviewed. NIOSH links to OSHA's Cold Stress Guide and winter weather resources, and the General Duty Clause can apply to recognized hazards. Ask your safety professional about your site. This is not legal advice. ## Terms on this page - [Heat illness prevention plan](https://jmarsolutions.multisites.ai/glossary/heat-illness-prevention-plan) - [Core body temperature](https://jmarsolutions.multisites.ai/glossary/core-body-temperature) - [On-site consultation](https://jmarsolutions.multisites.ai/glossary/on-site-consultation) - [General Duty Clause](https://jmarsolutions.multisites.ai/glossary/general-duty-clause) - [Buddy system](https://jmarsolutions.multisites.ai/glossary/buddy-system) - [Toolbox talk](https://jmarsolutions.multisites.ai/glossary/toolbox-talk) - [Cold stress](https://jmarsolutions.multisites.ai/glossary/cold-stress) - [Heat stress](https://jmarsolutions.multisites.ai/glossary/heat-stress) - [Hypothermia](https://jmarsolutions.multisites.ai/glossary/hypothermia) - [Frostbite](https://jmarsolutions.multisites.ai/glossary/frostbite) ## Sources 1. [CDC NIOSH: Cold and Work: Types, Causes, Preparation](https://www.cdc.gov/niosh/cold-stress/about/index.html) 2. [CDC NIOSH: Cold and Work: Types, Causes, Preparation](https://www.cdc.gov/niosh/cold-stress/about/index.html) 3. [CDC NIOSH: Cold and Work: Types, Causes, Preparation](https://www.cdc.gov/niosh/cold-stress/about/index.html) Checked against the sources above on November 5, 2026. Rules and guidance change, so check the linked page before you act. This page is general information, not legal or medical advice. ## Keep reading - [Heat stress prevention for high-risk crewsHeat stress prevention starts with water, rest and shade, then adds acclimatization for new workers, supervisor training and a written plan. NIOSH says to give workers cool water near the work area and to build up heat exposure over 7 to 14 days. Electrolytes support hydration when a crew sweats for hours.](https://jmarsolutions.multisites.ai/heat-stress-prevention) - [A 5-minute heat toolbox talk, word for wordA heat toolbox talk is a short crew meeting before work that covers the signs of heat illness, how often to drink, who watches whom, and when to call 911. This guide gives a word-for-word script that takes about five minutes, built on NIOSH training guidance, plus a sign-off sheet.](https://jmarsolutions.multisites.ai/guides/heat-toolbox-talk) - [Cold Work, Hidden Dehydration: A Winter Hydration CheckCrews can get dehydrated in the cold. A 2025 review of worker hydration lists cold-induced diuresis, lost water in breath, heavy clothing, and a weaker thirst sense as causes. NIOSH tells employers to provide warm liquids and warm break areas. Check hydration on cold days, not just hot ones.](https://jmarsolutions.multisites.ai/blog/winter-hydration-check-for-crews) - [OSHA heat rules: what applies to your crew todayAs of November 2026, OSHA has no final federal heat standard. A heat rule is proposed, not in force. OSHA enforces heat hazards today under the General Duty Clause and its Heat National Emphasis Program, revised April 10, 2026. Texas has no state heat standard, and HB 2127 ended local water-break rules.](https://jmarsolutions.multisites.ai/osha-heat-rules) - [Build a heat stress program in 8 stepsA heat stress program has eight parts: name a daily lead, measure heat on site, set advisory-day triggers, give water, rest and shade, acclimatize workers, train everyone, plan first aid and 911, then review. OSHA says employers should write the plan down. This follows OSHA and NIOSH guidance, not a final federal rule.](https://jmarsolutions.multisites.ai/guides/heat-stress-program-for-employers) - [A jobsite hydration plan that crews followNIOSH says workers doing moderate activity in the heat for under 2 hours should drink 1 cup (8 oz) of water every 15 to 20 minutes. If sweating lasts several hours, NIOSH says to drink sports drinks with balanced electrolytes. Fluid intake generally should not exceed 6 cups per hour.](https://jmarsolutions.multisites.ai/guides/jobsite-hydration-plan) ![Ironworkers silhouetted on a steel frame against a hot orange sunset](https://jmarsolutions.multisites.ai/_astro/sunset-steel.IhAMDca0_6wk53.webp) ## See it on your crew in 15 minutes Jennifer walks your safety team through the drops, the protocol and the numbers on a short live call. [Book a 15-minute demo](https://calendly.com/jen-jmarsolutions/15-min-meeting)