Heat Illness Prevention Plan for Small Business
Quick Answer
A heat illness prevention plan is a written plan for keeping employees safe in hot conditions. Federal OSHA relies on the General Duty Clause, which requires employers to keep the workplace free from recognized hazards likely to cause death or serious harm, and that covers heat. OSHA encourages water, rest and shade. NIOSH recommends that new workers start with no more than 20% of a normal heat exposure on day one and increase by no more than 20% each day. A good plan also covers warning signs, first aid, emergency steps and training. Some states, including California, Colorado, Minnesota, Oregon and Washington, have their own heat standards.
Heat is one of the most underestimated hazards at work. Roofers, landscapers, construction crews, warehouse staff, kitchen workers and delivery drivers can all face dangerous heat, sometimes on days that don't feel extreme. According to OSHA, every year thousands of workers become sick from occupational heat exposure, and some cases are fatal.
The good news is that heat illness is largely preventable with simple steps: water, rest, shade, a gradual start for new workers and a team that knows the warning signs. This guide explains what OSHA expects, how to build a heat illness prevention plan, how acclimatization works, how to respond to an emergency and how to handle breaks and pay for hourly employees. It ends with a free template you can adapt.
Note: This is general information, not legal advice or medical advice. Some states have their own heat rules that go further than federal guidance. Check your state's requirements and talk with a safety professional if you're unsure.
What OSHA Expects From Employers
Federal OSHA's heat standards page relies on the General Duty Clause, Section 5(a)(1) of the Occupational Safety and Health Act. It requires each employer to provide a workplace free from recognized hazards that are causing or are likely to cause death or serious physical harm to employees. OSHA says this covers heat hazards that could seriously injure or kill workers.
In plain terms, even without a federal rule written specifically for heat, employers are expected to recognize heat as a hazard and take reasonable steps to protect workers. OSHA also runs a National Emphasis Program focused on heat-related hazards, which directs inspection attention to industries where heat illness is a known risk.
States With Their Own Heat Standards
OSHA lists California, Colorado, Minnesota, Oregon and Washington as states with standards for heat exposure. OSHA notes that Minnesota's standard applies to indoor places of employment. If you operate in one of these states, read your state's rule carefully, because it may set specific temperature triggers, break schedules, shade rules and training requirements.
Who Is at Risk?
| Work setting | Why heat is a risk |
|---|---|
| Roofing and construction | Direct sun, hot surfaces, heavy physical work |
| Landscaping and agriculture | Long hours outdoors, limited shade |
| Warehouses and manufacturing | Poor ventilation, heat from equipment |
| Commercial kitchens and bakeries | Ovens, fryers and steam |
| Delivery and field service | Hot vehicles, attics, crawl spaces and rooftops |
| Workers wearing protective gear | Heavy clothing traps body heat |
| New or returning workers | Bodies haven't adjusted to the heat yet |
Personal factors also matter. Some medications, health conditions, prior heat illness and low fitness can make a worker more vulnerable. You don't need to know an employee's medical details, but your plan should encourage anyone who feels unwell to speak up without fear.
The Core of Prevention: Water, Rest and Shade
OSHA encourages water, rest and shade as prevention as well as treatment for heat-related illness. OSHA also says prevention should reduce workload in hot conditions, for example through a slower pace, scheduling heavy work in the morning, shorter shifts and frequent breaks in shade or away from heat sources.
| Element | What it looks like in practice |
|---|---|
| Water | Cool drinking water close to where people work, with reminders to drink regularly, not just when thirsty |
| Rest | Scheduled breaks that get longer and more frequent as heat rises |
| Shade or cool space | A shaded area, air-conditioned vehicle or cool room close to the work |
| Workload | Heavy tasks early in the day, rotating hot tasks, more people on demanding jobs |
| Clothing and gear | Light, breathable clothing when possible; cooling vests or towels for workers in protective gear |
Acclimatization: The Step Most Businesses Miss
Acclimatization means letting the body gradually adjust to working in heat. Workers who are new to the job, new to hot conditions or returning after time away are at the highest risk in their first days. OSHA says that during workers' first few days in warm or hot environments, employers should encourage them to drink adequate fluids, work shorter shifts, take frequent breaks and quickly identify symptoms of heat illness.
NIOSH, the federal research agency for workplace safety, recommends specific schedules:
| Worker | Day 1 | Day 2 | Day 3 | Day 4 | Day 5+ |
|---|---|---|---|---|---|
| New to the job | No more than 20% | Up to 40% | Up to 60% | Up to 80% | Up to 100% |
| Experienced in the job | No more than 50% | 60% | 80% | 100% | 100% |
For new workers, NIOSH says the schedule should be no more than a 20% exposure on day 1 and an increase of no more than 20% on each additional day. For workers with previous experience in the job, NIOSH recommends no more than 50% exposure on day 1, 60% on day 2, 80% on day 3 and 100% on day 4. "Exposure" means the share of a normal workday spent in the hot conditions. The rest of the time can be spent on cooler tasks, training or work in a shaded or air-conditioned area.
Who Needs an Acclimatization Plan?
- New hires starting during warm weather.
- Seasonal workers and temps.
- Employees returning from a week or more away, such as vacation or illness.
- Employees transferring from indoor to outdoor work.
- Everyone, at the start of the first heat wave of the season.
Warning Signs and First Aid
Everyone on the team should know the signs of heat illness, because workers often don't recognize the symptoms in themselves. OSHA lists these signs:
| Condition | Signs listed by OSHA | What to do |
|---|---|---|
| Heat exhaustion | Fatigue, irritability, thirst, nausea or vomiting, dizziness or lightheadedness, heavy sweating, elevated body temperature or fast heart rate | Move the worker to a cooler area, cool them promptly and don't leave them alone. When in doubt, cool the worker and call 911. |
| Heat stroke | Confusion, slurred speech, unconsciousness, seizures, very high body temperature, rapid heart rate | Call 911 right away. Cool the worker with ice or cold water until help arrives and stay with them. |
Cooling a Worker in an Emergency
OSHA calls submerging the worker in an ice bath the best method to cool workers rapidly in an emergency. Other steps OSHA lists include:
- Removing heavy outer clothing, especially protective gear.
- Applying ice or cold wet towels to the head, neck, trunk, armpits and groin.
- Using fans to move air around the worker.
OSHA's guidance is simple: when in doubt, cool the worker and call 911. Heat stroke is a medical emergency.
Breaks and Pay for Hourly Employees
Heat breaks raise a practical payroll question. Under federal rules, rest periods of short duration, usually 20 minutes or less, must be counted as hours worked. So short cool-down breaks for hourly, non-exempt employees are paid time. Longer bona fide meal periods, when the employee is completely relieved from duty, generally don't need to be paid. State laws may add break requirements, and some state heat rules require specific rest or cool-down periods. See are lunch breaks paid for more.
A few more pay points to plan for:
- Shorter shifts during acclimatization: if a new hire works fewer hours in the heat but spends the rest of the shift on other tasks or training, that time is still work time.
- Training on heat safety: required training is work time. See are training hours paid.
- Sending people home early: if you end a shift early because of extreme heat, hourly employees are paid for the hours they actually worked. Some states have reporting-time pay rules. See do you have to pay employees when you close for bad weather.
- Earlier start times: moving shifts earlier to avoid afternoon heat is a schedule change. Give notice and keep tracking hours and overtime.
How to Build a Heat Illness Prevention Plan
Step 1: Identify Where and When Heat Is a Risk
List the jobs, locations and times of year where employees work in heat, including indoor areas near ovens, furnaces or poorly ventilated spaces. Note any tasks that require heavy protective clothing.
Step 2: Decide How You'll Monitor Conditions
Pick a way to check the heat each day, such as a local forecast that includes the heat index, or a thermometer for indoor areas. Decide who checks, when and what happens at higher levels.
Step 3: Set Water, Rest and Shade Rules
Spell out where water and shade will be, how breaks change as heat rises and who is responsible for making sure supplies are on site.
Step 4: Write an Acclimatization Schedule
Use the NIOSH schedule as a starting point and decide how supervisors will track it for new and returning workers.
Step 5: Plan for Emergencies
Write down how to call for help at each site, the address or GPS location to give 911, where cooling supplies are and who is trained to respond.
Step 6: Train Everyone
Train employees and supervisors before hot weather arrives: the signs of heat illness, first aid, how to report symptoms and the buddy system.
Step 7: Review and Improve
After every heat wave or incident, review what worked and update the plan.
Heat Level Action Guide
Many businesses use a simple tiered plan that adds protections as the heat index rises. Your exact triggers should follow your state's rule if you have one and the advice of a safety professional. Here is an example structure:
| Level | Example actions |
|---|---|
| Warm | Water and shade available; remind workers to drink; watch new workers closely |
| Hot | Scheduled cool-down breaks; buddy system; heavy work moved earlier |
| Very hot | Longer and more frequent breaks; more workers on demanding tasks; supervisor check-ins |
| Extreme | Consider stopping or rescheduling non-essential heavy outdoor work |
Free Heat Illness Prevention Plan Template
Heat Illness Prevention Plan
Company: [ ] | Plan owner: [name, phone]
Applies to: [job sites, crews, indoor hot areas]
1. Monitoring
[Who] checks the heat index or temperature [when] using [forecast/thermometer]. Actions by level are listed in section 4.
2. Water
Cool drinking water will be available at each work area. [Who] stocks water and cups before each shift. Employees are encouraged to drink regularly, even if not thirsty.
3. Shade and Cool-Down
A shaded or cool area will be available near the work. Employees may take a cool-down break whenever they feel they need one. Short rest breaks are paid.
4. Actions by Heat Level
Warm: [ ]
Hot: [ ]
Very hot: [ ]
Extreme: [ ]
5. Acclimatization
New workers: no more than 20% of normal heat exposure on day 1, increasing no more than 20% per day. Experienced workers returning after [time] away: 50%, 60%, 80%, 100% over four days. Supervisors track and adjust tasks.
6. Buddy System and Check-Ins
Employees work in pairs and watch each other for signs of heat illness. Supervisors check in [how often] on hot days.
7. Emergency Response
If a worker shows signs of heat stroke, call 911 immediately, move them to shade, cool them with ice or cold water and stay with them. Site address/location: [ ]. Cooling supplies: [location].
8. Training
All employees and supervisors are trained on heat illness signs, first aid, reporting and this plan before [month] and when hired.
9. Reporting
Employees should report symptoms in themselves or others to [contact] right away. No one will be disciplined for reporting symptoms or taking a cool-down break.
Adapt the template to your work and any state rule that applies, and have a safety professional review it.
Example: A Landscaping Crew in July
A 12-person landscaping company hires two seasonal workers in early July. Under its plan, the new workers spend about 20% of the first day on heavy outdoor tasks such as mowing and planting, and the rest on loading trucks in the shade and equipment training. Their outdoor time increases gradually over the week.
On a day when the forecast heat index is high, the crew starts an hour earlier, takes a paid 10-minute break in the shade every hour and works in pairs. A crew lead notices a worker becoming confused and stops sweating. He calls 911, moves the worker into the air-conditioned truck, applies cold wet towels and stays with him until paramedics arrive. Because everyone had been trained, the response took minutes.
Common Heat Safety Mistakes
- Skipping acclimatization for new or returning workers.
- Water that's far away or runs out by mid-afternoon.
- No shade close to the work area.
- Discouraging breaks to keep jobs on schedule.
- Not paying short rest breaks for hourly employees.
- No emergency plan for remote job sites.
- Forgetting indoor heat in kitchens, warehouses and attics.
- Training too late, after the first heat wave hits.
Heat Illness Prevention Checklist
| Step | Done? |
|---|---|
| Identify jobs and locations with heat risk | |
| Choose how to monitor heat each day | |
| Provide water, rest and shade at every site | |
| Write an acclimatization schedule | |
| Set actions by heat level | |
| Write an emergency response plan for each site | |
| Train employees and supervisors before summer | |
| Check state heat rules | |
| Review the plan after heat waves or incidents |
Keep Crews Safe and Hours Accurate With Updoot
Updoot's scheduling makes it easy to move shifts earlier on hot days and build lighter schedules for new workers. The mobile time clock records hours at every job site, and SOP management keeps your heat plan and emergency steps where every crew lead can find them.
Sources
- OSHA: Heat Exposure
- OSHA: Heat Exposure Standards
- OSHA: Heat-Related Illnesses and First Aid
- CDC/NIOSH: Heat Stress, Acclimatization
- U.S. DOL: Fact Sheet #22, Hours Worked Under the FLSA