State compliance guide, updated August 2026

Arizona Heat Rules for Workers

Q: Do cooling vests work in Arizona's dry heat?

Dry heat is where evaporative vests work best, but at 110°F-plus ambient the evaporation cannot keep pace with the heat load, and the vests dry out mid-shift. Solid-state active cooling removes heat continuously for 8 to 12 hours regardless of temperature, which is why it holds up through a Phoenix summer shift.

Short answer: Arizona has no heat-specific standard, but that is not the same as no enforcement. ADOSH runs a heat stress emphasis program with targeted warm-season inspections, and it cites employers through the general duty clause. In the hottest major-city climate in America, "we followed the rules" is not a defense, because there is no rule to hide behind.

Reviewed by Anna B. Albright, Co-founder & CEO

Apply for early access Talk to the team

At a glance

What actually applies in Arizona.

ADOSH

State-plan enforcement

Arizona runs its own OSHA program under the Industrial Commission. No heat-specific rule, but full authority to cite heat hazards under the general duty clause.

SEP

Heat emphasis program

Published July 2023, guidance refreshed April 2026. ADOSH proactively inspects heat-exposed industries in the warm season: construction, landscaping, roofing, agriculture, delivery.

110°F+

Longest streaks in the U.S.

Phoenix holds the national record for consecutive 110°F-plus days. Rooftop and asphalt surface temperatures run far higher.

Year-round

Eight-month summers

Serious heat exposure in Arizona runs April through October. Programs built for a July spike underestimate more than half the season.

Sources: Industrial Commission of Arizona, heat resources; ADOSH Heat Stress State Emphasis Program.

Where cooling vests fit

Built for the only city with 30-day 110°F streaks.

At Phoenix ambient temperatures, evaporative gear dries out mid-shift and ice melts before the first break. Active cooling is the only wearable category that removes heat at a constant rate all shift, and in a state where enforcement rides on what a reasonable employer would do, issuing it is a very legible answer.

120°F+Clema tested beyond Phoenix summer conditions.
8–12 hrFull shift with one battery swap, April through October.
GDC evidenceDocumented active cooling strengthens the reasonable-employer defense.
Dry-air proofNo dependence on evaporation that quits at extreme ambient.
Low-profileSub-3 lbs, works with a fall-arrest harness on roofing crews.

FAQ

Arizona heat rules: employer FAQ.

Does Arizona have a heat standard for workers?

No heat-specific standard, but that is not the same as no enforcement. Arizona runs its own OSHA program (ADOSH), which published a State Emphasis Program for outdoor and indoor heat-related hazards on 17 July 2023 and refreshed its heat guidance in April 2026. The SEP directs targeted warm-season inspections of heat-exposed industries, enforced through the general duty clause rather than a dedicated standard.

What is ADOSH's heat stress emphasis program?

A state-level enforcement initiative that directs ADOSH inspectors to proactively check employers in agriculture, construction, landscaping, roofing, and similar heat-exposed industries. Inspectors look for water, shade, rest, acclimatization, training, and an emergency plan.

How extreme is worker heat exposure in Phoenix?

Phoenix now records the longest 110°F-plus streaks of any major U.S. city, with asphalt and rooftop surface temperatures far higher. Maricopa County has recorded hundreds of heat deaths in recent summers. For outdoor crews this is the most sustained extreme-heat exposure in the country.

What does ADOSH expect from an Arizona heat program?

The same core elements federal OSHA expects: cool water within reach, shade for breaks, a work-rest schedule matched to conditions, acclimatization, training in a language workers understand, an emergency response plan, and controls such as scheduling and cooling PPE. The OSHA heat index break chart covers the work-rest bands.

Do cooling vests work in Arizona's dry heat?

Dry heat favors evaporative vests, but at 110°F-plus the evaporation cannot keep pace with the heat load and the vests dry out mid-shift. Solid-state active cooling removes heat continuously for 8 to 12 hours regardless of ambient temperature. See the cooling vest comparison.

Arizona Heat Rules for Workers

What actually applies in Arizona.

Built for the only city with 30-day 110°F streaks.

Arizona heat rules: employer FAQ.

Keep reading.

Nevada Heat Standard

Texas Heat Rules

Cooling Vest Types Compared

Get Arizona crews through the brutal hot season.