Ask a roofer, a landscaping crew, or a warehouse supervisor whether federal law sets a temperature ceiling for outdoor work, and most will assume it does. It doesn't. In the summer of 2026, roughly 44 states still have no enforceable rule governing when employers must hand out water, shade, or rest breaks in dangerous heat — and the federal proposal meant to close that gap has been sitting in limbo for nearly two years.
A Federal Rule That Keeps Not Arriving
OSHA's draft standard, formally titled Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings, entered the Federal Register on August 30, 2024. It would require water, shade or cooling, and scheduled breaks once the heat index hits 80°F, escalating to mandatory 15-minute rests every two hours at 90°F.
Since publication, the rule has crawled through the standard machinery of federal rulemaking: an initial comment window that closed in January 2025, hearings that ran into the summer, and a post-hearing comment period that finally closed on October 30, 2025. Employment attorneys at DLA Piper note that the rule's fate and timing remain an open question even now. A separate legal tracker, Ogletree Deakins, goes further, describing the regulation as effectively frozen with no indication the current administration intends to move it forward given its broader deregulatory posture.
What's Actually Keeping Workers Safe Right Now
Absent a finished rule, OSHA falls back on two blunter tools. The first is the General Duty Clause, a 1970 provision letting inspectors cite any employer that exposes staff to a "recognized hazard," heat included, without needing a specific numeric trigger.
The second is enforcement targeting. The agency's original heat inspection initiative expired on schedule on April 8, 2026, and OSHA replaced it two days later with a broader, five-year version reaching into 55 high-risk sectors, according to industry safety consultancy TriCore Safety. That firm's review of federal fatality records found a stark and stubborn pattern: construction employs only about 6% of the U.S. workforce yet has absorbed roughly a third of all occupational heat deaths for three decades running. Heat-focused inspections have also grown from a rounding error — about half a percent of everything OSHA does — to close to 6% of its total inspection activity over the past five years.
The death toll behind those figures is real and rising. Compliance tracker Certainty cites Bureau of Labor Statistics data showing 55 workers died of occupational heat exposure in 2023, a 77% jump from 31 deaths in 2012. Because heat illness is so often misdiagnosed or miscoded as something else, researchers at George Washington University's Milken Institute School of Public Health put the true injury count far higher, at roughly 28,000 heat-linked work injuries annually.
Six States Have Rules. Most Don't.
Where Washington has stalled, a handful of statehouses have not. Six state OSHA programs enforce binding heat standards tougher than the stalled federal proposal: California, Oregon, Washington, Nevada, Colorado, and Maryland, per Certainty's 2026 state-by-state review. A seventh, Minnesota, is sometimes added to that list, but its standard only reaches indoor workplaces — which is why counts of "states with heat rules" bounce between six and seven depending on who's counting and what they're counting.
California's version is widely considered the strictest: shade requirements once temperatures cross 80°F, mandatory cool-down breaks at 95°F, a written prevention plan, and a two-week window to acclimatize new hires. Oregon and Washington mirror the 80°F trigger point but escalate rest-break length more aggressively as temperatures rise — Oregon requires 30 minutes of cooling time per hour once the heat index hits 100°F. Maryland's standard took effect in September 2024 and Nevada's enforcement began in April 2025; both are narrower than California's but still binding. Colorado's rule, revised effective January 2026, covers agricultural employers only.
Outside that group, protection ranges from thin to nonexistent. Arizona spent a year building a Workplace Heat Safety Task Force, but the guidelines it produced this spring are voluntary — advocates and even the state's own safety consultants describe them as falling short of enforceable protection, since Arizona still relies on the General Duty Clause for anything beyond recommendations, according to Cronkite News reporting on the task force's outcome.
New Mexico's path has been slower still. State regulators first proposed a heat rule in March 2025, with an original hearing planned for June and then pushed to July of that year. As of mid-2026, the rulemaking remains unresolved: advocacy group Climate Action Now NM lists the next formal hearing for September 21–25, 2026 — more than a year after the process began.
Two Competing Bills, Neither Likely to Pass
Congress has tried to force the issue from both directions, and the results illustrate exactly why nothing has moved. Senator Alex Padilla and Representative Judy Chu reintroduced the Asunción Valdivia Heat Illness, Injury, and Fatality Prevention Act in July 2025, named for a farmworker who collapsed and died of heat stroke after ten hours picking grapes in 105°F heat in 2004. The bill's core mechanism is procedural but consequential: it would force the Department of Labor to publish an enforceable interim heat standard within a year of passage, one that stays in effect until a permanent rule eventually replaces it — sidestepping the years-long rulemaking process that has stalled OSHA's own proposal.
The opposing camp moved just as fast. Representative Mark Messmer introduced the Heat Workforce Standards Act of 2025 that November, aiming to permanently bar the Labor Department from finalizing OSHA's proposed rule or any comparable version of it going forward, as reported by industry outlet TCI Magazine. Messmer has called the underlying OSHA proposal "sweeping and unworkable," and the bill has drawn two dozen House cosponsors plus backing from small-business groups who argue a single national temperature trigger ignores regional climate differences.
With one bill trying to mandate a federal floor and the other trying to outlaw one, congressional trackers and legal analysts alike consider it unlikely that either measure clears this Congress.
Where That Leaves Workers This Summer
Strip away the acronyms and the state-by-state exceptions, and the picture is simple: for outdoor workers in the large majority of states, there is no enforceable trigger temperature, no mandated break schedule, and no federal water requirement — only the General Duty Clause's general expectation of a "safe" workplace and an inspection program with no fixed thresholds of its own. Anyone assuming otherwise is operating on a false sense of security, and neither Congress nor the rulemaking process looks likely to close that gap before the next heat wave arrives.
