Oregon has no specific law or regulation requiring employers to conduct fire drills, with the exception of schools. Local safety codes may contain additional requirements.
Oregon's own state health and safety code (OR Rev. Stat. 654.001et seq.) has adopted the occupational safety standards set by the federal Occupational Safety and Health Act (OSH Act), which requires that companies with 10 or more employees have written fire prevention and emergency exit plans in place for each worksite. Employers with fewer than 10 employees may communicate the plans orally.
There is additional information and a more detailed discussion of federal OSH Act emergency and fire plan requirements. Also, check local fire safety codes, which may contain additional requirements.