Current model and tournament policy · last source review

Michigan heat rules for high school sports.

Michigan publishes a heat-index model policy that is mandatory for MHSAA tournaments but not universally mandated for regular-season school activity. Confirm your school's adoption.

What coaches need to know

The model requires activity-site temperature and humidity checks and written records.
Below 95°F heat index: ample water, optional 10-minute breaks every 30 minutes, cooling towels, and monitoring.
95–99°F: reduce activity, consider postponing, remove idle contact equipment, and recheck every 30 minutes.
100–104°F: mandatory breaks, alter uniforms, postpone, and suspend activity requiring protective equipment.
105°F and above: stop outdoor activity and indoor activity without air conditioning.

Model Policy for Managing Heat & Humidity

The model policy calls for temperature and humidity readings at the activity site 30 minutes before and 60 minutes after activity begins, with written records. It is mandatory for MHSAA tournament managers but is a model, not a universal regular-season mandate.

Condition	What the coach does
Heat index under 95°	Normal activity with heat precautions Keep ample water available. Offer 10-minute water breaks every 30 minutes. Provide ice-down towels and monitor athletes.
Heat index 95°–100°	Reduce activity and consider postponing Keep ample water available and offer 10-minute breaks every 30 minutes. Remove helmets and equipment when athletes are not involved in contact. Reduce outdoor activity and consider postponing. Recheck every 30 minutes.
Heat index 100°–105°	Postpone or sharply modify activity Provide mandatory 10-minute water breaks every 30 minutes. Alter uniforms and reduce activity. Postpone practice to later in the day. Suspend contact activity requiring helmets or protective equipment until heat index is 99°F or below.
Heat index 105° and above	Stop activity Stop all outdoor activity. Stop indoor activity if air conditioning is unavailable.

Source reviewed 2026-07-30. An on-site field reading is required for the official call.

Check my location’s forecast Read the official source

Use the current governing document. Local schools, districts, leagues, activities, and medical staff may apply additional or stricter requirements.

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