# OAR 437-002-0156 — State Heat Illness Prevention Standards — Temperature Triggers and Required Employer Actions

For OAR 437-002-0156, jurisdiction is Oregon; effective date is June 15, 2022; initial trigger temperature f is 80; initial trigger actions is Shade when heat index equals or exceeds 80°F; drinking water up to 32 ounces per hour; encourage and allow preventative cool-down rest periods; high heat trigger temperature f is 90, recorded from its source on 2026-08-17.

- **jurisdiction:** Oregon _(verified: appears in the quote below)_
- **regulation citation:** OAR 437-002-0156 _(verified: appears in the quote below)_
- **effective date:** June 15, 2022 _(our reading, not quoted from the source)_
- **initial trigger temperature f:** 80 _(verified: appears in the quote below)_
- **initial trigger actions:** Shade when heat index equals or exceeds 80°F; drinking water up to 32 ounces per hour; encourage and allow preventative cool-down rest periods _(our reading, not quoted from the source)_
- **high heat trigger temperature f:** 90 _(verified: appears in the quote below)_
- **high heat actions:** Mandatory rest break schedule: at heat index 90°F or greater, minimum 10 minutes every 2 hours; at 100°F or greater, 15 minutes every hour (Table 1 minimum). Simplified schedule option (Table 2): 90°F 10 min/2hr, 95°F 20 min/hr, 100°F 30 min/hr, 105°F 40 min/hr. Communication by voice or electronic means; buddy system or regular communication for lone workers; designated employee authorized to call for emergency medical services _(our reading, not quoted from the source)_
- **coverage scope:** Indoor and outdoor; all industries where heat index equals or exceeds 80°F; exempt: incidental exposure under 15 min/hr, heat from work process, emergency operations, mechanically ventilated buildings below 80°F _(our reading, not quoted from the source)_
- **acclimatization period days:** 14 _(verified: appears in the quote below)_
- **written plan required:** Yes _(our reading, not quoted from the source)_

## What the source says

> This standard applies whenever an employee performs work activities, whether in indoor or outdoor environments, where the heat index (apparent temperature) equals or exceeds 80 degrees Fahrenheit.

## Source

- https://osha.oregon.gov/OSHARules/div2/div2J.pdf

Last verified: 2026-08-17. Review by: 2027-08-17.
Part of [State Heat Illness Prevention Standards — Temperature Triggers and Required Employer Actions](https://referencesource.org/state-heat-illness-prevention-standards/).