It is April. In most of the country, that means you have maybe six to eight weeks before heat becomes a real hazard on outdoor job sites. That window is your preparation time. Do not waste it.
Heat kills more outdoor workers in the United States than tornadoes, hurricanes, and floods combined. That is not a talking point. That is a documented pattern. And right now, heat is one of OSHA's top enforcement priorities going into the summer season.
States are moving fast on this. Nevada and Maryland have already adopted heat regulations requiring written heat illness prevention programs, worker exposure assessments, and formal training. New Mexico is in active rulemaking. Cal/OSHA issued its first excessive heat notice of 2026 back in March and has some of the most stringent requirements in the country, including high-heat protocols when temperatures hit 95 degrees, mandatory rest periods, and requirements for supervisors to observe workers for symptoms.
At the federal level, OSHA has been expanding its heat enforcement through a National Emphasis Program. A formal federal heat standard has been in development and is expected to move forward. Whether or not your state has a specific rule right now, OSHA's general duty clause gives inspectors the authority to cite employers for heat hazards. If you wait for a specific regulation to land before you act, you are already behind.
The core issue is acclimatization. Most heat fatalities happen in the first few days on the job or during the first heat event of the season, when bodies have not yet adjusted to working in high temperatures. A new hire in July, a crew returning from a week off, the first 90-degree day of the year. These are when people get hurt.
If you are running a crew outdoors this summer, the question is not whether heat is a risk. It is whether your program can hold up if someone collapses on your site and OSHA shows up the next day.
Best Practices and Tips
Before heat season starts:
- Write a heat illness prevention plan. It needs to be site-specific, not a generic template.
- Train your supervisors to recognize heat exhaustion and heat stroke. They are not the same thing and the response is different.
- Stock water, shade, and rest area supplies before you need them. Running out on a 100-degree day is not the time to improvise.
On the job:
- Acclimatize new workers and returning workers. Start with shorter exposure periods and build up over 7 to 14 days.
- Schedule heavy work for the cooler parts of the day when possible.
- Set up a buddy system or observation protocol during high-heat periods. People do not always know they are in trouble.
- Establish a communication method so workers can call for help from anywhere on the site.
Compliance specifics:
- If you work in California, review the Cal/OSHA heat illness prevention standard now. The requirements for shade, water, and rest apply at 80 degrees. High-heat provisions kick in at 95.
- Check your state's current rules. Nevada, Maryland, Washington, Oregon, and New Mexico all have active frameworks.
- Document your training. If something happens and OSHA investigates, training records matter.
April is the right time to do this. Get the plan written, run the training, and make sure your supervisors know what to look for. Summer comes whether you are ready or not.