Every teacher misses a day eventually. A sick kid, a training, an emergency. The question is whether your classroom runs without you or falls apart.
The best sub plans aren't about the lesson. They're about the routines.
What a substitute needs in the first five minutes
A seating chart with names that match faces. Print it. Don't make them hunt.
The bell ringer, already on the board or easy to project. Students who start working immediately set the tone for the sub.
Attendance instructions.
One or two reliable students per class who can answer questions.
Your behavior plan in one paragraph.
Keep the routine the same
Students behave best for a sub when the day looks like any other day. Same warm-up, same structure, same exit ticket at the end. A sub day isn't the time for something new and complicated.
The Daily Bell Ringers site is useful here: tell the sub to open today's set for the grade band and project it. No prep, and it's live before school starts.
The lesson itself
Choose independent work students can do without you explaining it. Review, reading with questions, or a project work day.
Avoid anything that needs tech troubleshooting.
Make it collectible. Students turn something in, so you know who worked.
Build an emergency sub folder now
Don't wait for the morning you wake up sick. Keep a folder with:
Seating charts for every class
Your routines and procedures
Three days of generic lessons
Your behavior plan
Emergency procedures and contacts
More help
Teacher Emergency Toolkit (paid, on TPT): Ready-made sub plan packs for the days you didn't see coming.