OSHA Heat Standard 2026: Where the Rulemaking Actually Stands

Every June, somebody asks us the same question: "Is the OSHA heat rule in effect yet?"

The short answer is no. The longer answer is more useful — because "no federal standard" does not mean "no enforcement," and the gap between those two things is where employers get caught.

Here's an honest read on where the OSHA heat standard sits as of August 2026.

What OSHA Actually Proposed

On August 30, 2024, OSHA published a proposed rule called Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings (Docket No. OSHA-2021-0009, 89 Fed. Reg. 70698). It would apply across general industry, construction, maritime, and agriculture.

The proposal is built around five requirements:

• A written, site-specific heat injury and illness prevention plan
• Initial triggers at an 80°F heat index — drinking water, access to shade or a cooled area, and rest breaks as needed
• High-heat triggers at a 90°F heat index — mandatory rest breaks, closer employee monitoring, and hazard alerts
• Acclimatization schedules for new and returning workers
• Training and emergency response for workers and supervisors

Those thresholds matter even now. Inspectors already reference them when deciding whether an employer's heat controls are reasonable.

Where the Rulemaking Sits Right Now

The comment period closed in January 2025. OSHA held an informal public hearing from June 16 through July 2, 2025, and the post-hearing comment window closed October 30, 2025.

Then it slowed down. The current administration's deregulatory posture doesn't fit a rule this prescriptive, and the docket sat.

The Department of Labor's 2026 regulatory plan says OSHA intends to issue a supplemental notice of proposed rulemaking in December 2026 (RIN 1218-AD39), with the stated goal of scaling back burdens commenters flagged. A supplemental proposal is a rarely used step — OSHA reaches for it when the final rule would look meaningfully different from what was proposed.

DOL's published target for a final standard is October 2027. Treat that date with skepticism. A supplemental proposal has to clear OMB review, publish, collect comments, get analyzed, get written into final regulatory text, and clear OMB again. That sequence rarely takes twelve months. A realistic planning assumption is that no federal heat standard is enforceable before 2029 — and possibly much later, depending on how the 2028 election goes.

Enforcement Didn't Pause

This is the part employers miss. On April 10, 2026, OSHA issued an updated National Emphasis Program for outdoor and indoor heat-related hazards (CPL 03-00-024), replacing the 2022 version that expired two days earlier.

The updated Heat NEP:

• Targets 55 high-hazard industries — 33 carried over from the old list, 22 newly added
• Runs for five years, through 2031
• Directs random, programmed inspections in targeted industries on days the National Weather Service issues a heat advisory or warning
• Expands any inspection where heat hazards show up on a heat priority day

The added industries pull the program well beyond agriculture and construction — warehousing, department stores, freight trucking, plastics and metalworking manufacturing, animal processing, and electric power work are all on the list now.

Without a specific standard, OSHA cites heat exposure under the General Duty Clause, Section 5(a)(1) of the OSH Act. That's a harder case for the agency to prove, but it's a real one, and the NEP tells inspectors exactly where to look.

Congress Is Trying to Block It

On July 21, 2026, the House Education and Workforce Committee approved H.R. 6213, the Heat Workforce Standards Act, by an 18–15 vote. Introduced by Rep. Mark Messmer (R-Ind.), it would bar the Secretary of Labor from finalizing, implementing, or enforcing the 2024 proposal — or anything "substantially similar."

Practically, it's a message bill. It would need 60 votes in the Senate, and the votes aren't there. But it signals that the political ceiling on a federal heat standard is low for now.

The States Are Where the Action Is

Seven states currently enforce their own workplace heat rules: California, Colorado, Maryland, Minnesota, Nevada, Oregon, and Washington. Coverage varies widely — California, Maryland, and Oregon cover indoor and outdoor work comprehensively; Minnesota covers indoor only; Washington covers outdoor only; Colorado covers agriculture only.

Virginia has legislation requiring an enforceable standard, and New Mexico is in active rulemaking. More than a dozen additional states introduced heat proposals in 2025. Meanwhile Florida and Texas moved the other direction, barring local governments from imposing heat protections.

That patchwork is the real wildcard. Multi-state employers eventually get tired of complying with fifteen different rules and start asking OSHA for one. It's what happened with hazard communication in the 1980s — states passed right-to-know laws, industry complained, and a Republican OSHA issued a federal standard that preempted them. History could rhyme here.

What This Means for Michigan Employers

Michigan operates under MIOSHA, a state plan. MIOSHA has no heat-specific standard. It runs a State Emphasis Program on heat, publishes a sample heat illness prevention plan, and cites heat exposure under the general duty clause in Section 11(a) of Act 154.

So Michigan employers are in the same position as everyone else: no standard to comply with, and an inspector who can still write you up.

Ask Yourself

• Do we have a written heat illness prevention plan, or just habits?
• Are we on the 55-industry NEP target list?
• Do supervisors know the difference between heat exhaustion and heat stroke — and who calls 911?
• Do new hires get an acclimatization ramp, or full production on day one?
• Are we measuring heat index, or reading a wall thermometer?

If you can answer those five, you're most of the way to compliance with whatever OSHA eventually publishes. If you can't, the standard isn't your problem — the summer is.

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