Heat illness prevention for outdoor crews

Why heat is a crew-management problem

Outdoor home service crews work through the hottest months of the year, often on roofs, in attics and on open lawns with little shade. Landscaping employment peaks in summer, at 1,016,900 in July 2026^[4], which means the largest number of workers, including many new and seasonal hires, are outside at the hottest time. Building and grounds cleaning and maintenance occupations recorded 356 fatal work injuries in 2024, up from 337 in 2023^[5], and construction and extraction workers recorded 1,032^[6]. Heat is one of the hazards these crews face every summer.

Heat illness is preventable with planning. The core controls are well known: water, rest, shade, gradual acclimatization, training to spot symptoms and a clear plan for emergencies. The challenge is making them happen on every crew, every day, when the schedule is full.

Acclimatization: the first week matters most

Workers who are new to the heat, or returning after time away, are at the highest risk because their bodies have not adapted. NIOSH recommends that new workers spend no more than 20% of the usual duration of work in the heat on day one, with no more than a 20% increase each additional day^[1]. Workers with previous experience can build up faster, but should still follow a gradual schedule.

1. 01

   Day 1

   Experienced worker: no more than half the usual time in the heat; new worker: no more than a fifth^[1].

2. 02

   Day 2

   Experienced worker: no more than 60% of the usual time^[1].

3. 03

   Day 3

   Experienced worker: no more than 80% of the usual time^[1].

4. 04

   Day 4

   Experienced worker: back to the full usual time; new workers keep building up by no more than 20% a day^[1].

In practice, this means planning lighter or shorter outdoor work for new hires in their first week: shop work, morning-only routes or shade-heavy tasks. It also applies after a heat wave starts suddenly, and to returning workers after vacation or illness.

Water, rest and shade

Hydration has to be easy. For moderate activity in the heat lasting less than two hours, NIOSH recommends drinking 1 cup (8 oz.) of water every 15 to 20 minutes^[1]. Waiting until workers feel thirsty is too late. Stock every truck with enough cool water for the whole crew and the whole day, plus electrolyte drinks for long shifts, and make drinking a routine at every property, not a personal choice.

• Water: cool water on every truck, refilled before it runs out, with cups or bottles for each worker.
• Rest: scheduled breaks in the shade, longer and more frequent as the heat rises.
• Shade: pop-up canopies on trucks for jobs without natural shade; air-conditioned truck cabs for cool-down breaks.
• Schedule: start earlier in summer, move the heaviest work to the morning and shorten afternoon outdoor time.
• Clothing: light-colored, breathable uniforms and wide-brim hard hat accessories where allowed.

State heat rules: California as an example

Some states have their own heat illness standards. California’s rule for outdoor workplaces is one of the most detailed and gives a useful model even if you work elsewhere^[2]:

Other states, including some with large outdoor workforces, have adopted or proposed their own heat standards. Check your state’s occupational safety agency each spring, because rules and enforcement priorities are changing.

Where the federal OSHA rule stands

There is no final federal heat standard yet. OSHA published a notice of proposed rulemaking for heat injury and illness prevention in outdoor and indoor work settings on August 30, 2024; the public comment period closed on January 14, 2025; an informal public hearing ran from June 16 to July 2, 2025; and the post-hearing comment period ended on October 30, 2025^[3]. Check OSHA’s rulemaking page for the current status before relying on any timeline. A final rule would add specific federal requirements, but the controls in this guide are worth putting in place now regardless.

Roofers, attics and other hot spots

Some home service work is hotter than the weather report suggests. Roof surfaces in direct sun can be much hotter than the air, and attics on summer afternoons are often the hottest place on a job. HVAC techs who work in attics, roofers on dark shingles and crews working on asphalt driveways all need extra precautions. Schedule attic work for the morning, use portable fans to move air through the attic, limit time per visit and have a second person check in regularly. For roofing crews, move the heaviest tear-off work to the early hours and set up shade at ground level for breaks.

Use the forecast every day

A heat plan only works if someone checks the forecast and acts on it. Each evening in summer, the person responsible should check the next day's high temperature and heat index for each service area, decide which triggers apply and tell crew leaders before they leave. On the hottest days, start earlier, shorten outdoor work in the afternoon, add breaks and pair new workers with experienced ones. Many companies send a short text to every crew leader with the day's heat level and the actions that go with it, so nobody has to remember the rules from a training session months ago.

Records to keep

• The written heat plan, with the date it was last reviewed.
• Training records for every worker and crew leader, with dates and topics.
• Acclimatization schedules for new and returning workers.
• Daily heat triggers used on high-heat days and the actions taken.
• Any heat-related incident or near miss, what happened and what changed afterward.

Train crews to spot heat illness

Every crew member should know the signs of heat exhaustion and heat stroke, and every crew leader should know what to do. Train before the season starts and refresh it at the first heat wave.

1. Early signs: heavy sweating, cramps, headache, dizziness, nausea and unusual tiredness. Move the worker to shade, give water, loosen clothing and watch them.
2. Heat stroke signs: confusion, slurred speech, fainting, seizures, hot skin, or sweating that stops. Call 911 immediately.
3. While waiting for help: move the worker to the coolest place available, cool them with water and ice packs, and stay with them.
4. Never send a worker with symptoms home alone or let them drive.
5. Report every heat-related incident to the office the same day and review what happened.

Talking to crews about heat

Crews often push through heat because they do not want to look weak or slow the job down. Change that culture from the top. Crew leaders should take breaks with the crew, drink water in front of them and tell new workers on day one that stopping to cool down is expected, not a problem. Make it clear that nobody will lose pay or be criticized for reporting symptoms, in themselves or in a co-worker. A short heat talk at the start of each hot day, two minutes covering the forecast, the break plan and the warning signs, keeps the plan in everyone's mind when it matters.

A written heat plan for every crew

1. 01

   Assign responsibility

   Name the person who monitors the heat forecast and triggers high-heat procedures each day.

2. 02

   Set triggers

   Decide in advance what changes at higher temperatures: more breaks, earlier starts, observation of new workers.

3. 03

   Stock the trucks

   Water, cups, electrolyte drinks, shade canopy and a first-aid kit with cooling packs.

4. 04

   Plan acclimatization

   Schedule new and returning workers on a gradual build-up during their first week.

5. 05

   Train and drill

   Train every worker and crew leader before summer; drill the emergency response.

6. 06

   Review after incidents

   Look at every heat-related incident or near miss and adjust the plan.

Roofers face heat and fall hazards at the same time, so pair this plan with OSHA fall protection for roofing crews. Seasonal workers arriving through visa programs often start in peak heat; see H-2B visas for landscaping for planning their first weeks.