PracticeCast
2026–2027 · last source review

Arizona WBGT rules for high school sports.

Arizona uses Region 3 on-site WBGT bands with stricter limits during the first 14 practice days. PracticeCast defaults to that safer phase.

What coaches need to know

  • WBGT is checked on the playing surface every 30 minutes and monitoring is documented.
  • During practice days 1–14, modification bands begin at 79.8, 84.7, 87.7, and 89.8°F WBGT.
  • Beginning day 15, bands begin at 82.1, 87.0, 90.1, and 92.0°F WBGT.
  • Higher bands add breaks, cap practice at 2 hours then 1 hour, remove equipment, prohibit conditioning, and stop outdoor workouts.
  • Aquatic in-water activity is excepted; dry-land aquatic training follows the table.

Heat Illness Management — Practice days 1–14

Arizona is WBGT Region 3. This model applies the more conservative first-14-day acclimatization thresholds. WBGT is measured on the playing surface every 30 minutes.

ConditionWhat the coach does
WBGT up to 79.7°Normal activity
  • Provide at least a 3-minute break every 20 minutes.
WBGT 79.8°–84.6°Use discretion and modify equipment
  • Use discretion for intense or prolonged exercise.
  • Provide at least a 4-minute break every 20 minutes.
  • Modify equipment as needed.
WBGT 84.7°–87.6°Limit practice to 2 hours
  • Limit practice to 2 hours.
  • Provide at least a 4-minute break every 15 minutes.
  • Football: helmet, shoulder pads, and shorts only.
WBGT 87.7°–89.7°Limit practice to 1 hour; no conditioning
  • Limit practice to 1 hour.
  • Do not conduct conditioning.
  • Provide at least a 5-minute break every 15 minutes.
  • Do not wear protective equipment.
WBGT 89.8° and aboveNo outdoor workouts
  • Delay practice until a cooler on-site WBGT is reached.

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

Heat Illness Management — Practice day 15+

Arizona is WBGT Region 3. This model applies the day-15-and-later acclimatized-athlete thresholds. WBGT is measured on the playing surface every 30 minutes.

ConditionWhat the coach does
WBGT up to 82°Normal activity
  • Provide at least a 3-minute break every 20 minutes.
WBGT 82.1°–86.9°Use discretion and modify equipment
  • Use discretion for intense or prolonged exercise.
  • Provide at least a 4-minute break every 20 minutes.
  • Modify equipment as needed.
WBGT 87°–90°Limit practice to 2 hours
  • Limit practice to 2 hours.
  • Provide at least a 4-minute break every 15 minutes.
  • Football: helmet, shoulder pads, and shorts only.
WBGT 90.1°–91.9°Limit practice to 1 hour; no conditioning
  • Limit practice to 1 hour.
  • Do not conduct conditioning.
  • Provide at least a 5-minute break every 15 minutes.
  • Do not wear protective equipment.
WBGT 92° and aboveNo outdoor workouts
  • Delay practice until a cooler on-site WBGT is reached.

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

Check my location’s forecastRead the official source

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

Browse every state