Here is the full rule from the MHSAA Handbook for 2025-2026 year regarding practice.
"The football season shall extend from Monday, August 4, 2025, for classes 1A, 2A, 3A, 4A, 5A, 6A and 7A through the first full weekend in December. A scrimmage may be played August 22, 2025, for all classes. The regular season playing date will be August 28, 2025, for all classes. (With the beginning of fall football practice, players shall not wear football pads of any kind, football togs or football jerseys. Week 1 (Monday through Friday) helmets, face guards, mouthpieces and shoes are legal for the first week of practice (5 days). Week 2 Monday through Friday, shoulder pads can be worn – shorts/shoulder pads and helmets. After the completion of weeks 1 and 2, players can begin to practice in full gear.)