PracticeCast
Current statewide guidance · last source review

Missouri WBGT rules for high school sports.

Missouri requires districts to use an on-site WBGT procedure above 80°F ambient temperature and publishes five statewide activity bands.

What coaches need to know

  • Under 82°F WBGT: three 3-minute breaks each hour.
  • 82.0–86.9°F: three 4-minute breaks and close monitoring.
  • 87.0–89.9°F: maximum 2 hours, four breaks per hour, football equipment limits, and competitions delayed or canceled.
  • 90.0–92.0°F: maximum 1 hour, 20 minutes of rest, no conditioning, and no football protective equipment.
  • Over 92°F: no outdoor participation.

WBGT Activity and Rest Guidelines

MSHSAA requires a scientifically approved on-site WBGT instrument when ambient temperature exceeds 80°F. Districts must document their procedure; the association publishes the statewide activity bands.

ConditionWhat the coach does
WBGT up to 81.9°Normal activities
  • Provide at least three separate 3-minute rest breaks each hour.
WBGT 82°–86.9°Use discretion for intense or prolonged exercise
  • Watch at-risk athletes carefully.
  • Provide at least three separate 4-minute rest breaks each hour.
WBGT 87°–89.9°Limit participation to 2 hours
  • Limit participation to 2 hours.
  • Delay, reschedule, or cancel competitions.
  • Football: helmet, shoulder pads, and shorts only; remove all protective equipment for conditioning.
  • Provide four separate 4-minute breaks each hour.
WBGT 90°–92°Limit participation to 1 hour; no conditioning
  • Limit participation to 1 hour.
  • Delay, reschedule, or cancel competitions.
  • Do not conduct conditioning.
  • Football: no protective equipment.
  • Distribute 20 minutes of rest through the hour.
WBGT 92.1° and aboveNo outdoor participation
  • Cancel or delay practices and competitions until a cooler WBGT is reached.

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

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

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