OSHA's Heat Standard Is Coming: Here's What to Do Before Summer
The first-ever federal heat rule could drop any day. OSHA has already run 7,000+ inspections under its existing program. If you don't have a written heat plan, you're exposed.
OSHA's proposed heat illness prevention standard — the first federal rule of its kind — has been working through the rulemaking process since its Notice of Proposed Rulemaking in August 2024. Finalization is expected in 2026 with a 150-day phase-in. Warehouses are specifically named as high-risk indoor environments.
But here's what matters right now: you don't need to wait for the final rule to get cited.
OSHA is already enforcing. Between 2022 and late 2024, OSHA conducted roughly 7,000 heat-related inspections under its National Emphasis Program, which was extended through April 2026. That resulted in 60 citations and nearly 1,400 Hazard Alert Letters. Warehousing is one of the targeted sectors. OSHA can — and does — cite employers under the General Duty Clause, Section 5(a)(1) of the OSH Act, which requires workplaces to be free of recognized hazards likely to cause death or serious physical harm.
The trigger points are simple. At 80°F heat index: provide water and rest breaks. At 90°F: paid 15-minute breaks every two hours plus active monitoring for heat illness symptoms. New workers must be acclimatized gradually — OSHA's guidance recommends no more than 20% of normal hot-environment exposure on day one, increasing 20% each day after.
Several states already have specific heat rules on the books. If you operate in any of these states, you may already be subject to requirements beyond what federal OSHA is proposing:
Cal/OSHA's indoor heat standard (Section 3396) is the most comprehensive — it applies to most indoor workplaces including warehouses, triggers at 82°F, and adds stricter requirements at 87°F including work-rest schedules, active cooling, and temperature recordkeeping.
Oregon's heat illness prevention rule (OAR 437-002-0156) covers both indoor and outdoor environments when the heat index hits 80°F. It requires a written heat illness prevention plan, acclimatization procedures, mandatory rest break schedules, and annual employee training.
Washington's outdoor heat exposure rule (WAC 296-62-095 through 296-62-09560) triggers at 89°F for most outdoor workers. Washington does not yet have a specific indoor heat standard, but employers are still required to protect indoor workers from temperature extremes under general occupational health rules.
Minnesota's indoor heat standard (Rule 5205.0110, subpart 2) takes a different approach — it sets permissible exposure limits based on wet bulb globe temperature (WBGT) readings and work intensity level, with maximum WBGT of 77°F for heavy work and 86°F for light work. Warehouses doing heavy picking and loading would fall under the more restrictive limit.
What you need in place now: A written heat illness prevention plan. Temperature monitoring procedures. Water stations throughout the facility. Designated cool-down areas. Training records. An acclimatization protocol for new hires. If an OSHA inspector walks in this summer and you can't produce these, you're looking at a citation — final rule or not.
This is one of those situations where getting ahead of the regulation is cheaper than reacting to it.