Federal OSHA jurisdiction — no state plan
Colorado does not operate an OSHA-approved State Plan. Federal OSHA directly covers most private sector employers and workers in the state. State and local government workers are not covered by federal OSHA and do not have OSH Act protections in Colorado because the state lacks an approved plan.
Source: State Plans | OSHA
Agricultural worker heat illness protection requirements
Colorado requires agricultural employers to implement heat illness and injury protections on days when worksite temperatures reach or are forecast to reach at least 80 degrees Fahrenheit. Employers must provide potable drinking water, access to shade for breaks, safety procedures including effective communication means for emergencies, and training on heat illness prevention, signs, symptoms, and first aid. These requirements apply through the Agricultural Labor Conditions Rules adopted by the Division of Labor Standards and Statistics, effective May 1, 2022.
Source: 7 CCR 1103-15, Rule 3