Emergency Sub Plans for High School: What a Full No-Prep Day Needs

A high school sub day needs a real timetable, exact instructions for someone who doesn't know your students, work they can do without you, and an answer key for everything — not a worksheet and a hope. Here's what that looks like built out for a single Grade 9 period, and a checklist you can print.

What a real no-prep day is built from

  1. A “first five minutes” page. What to say at the door, how to set a signal for attention, notes on what to do for a handful of common situations, and what to collect at the end. This is the piece that keeps a day from unraveling in the first ten minutes.
  2. A bell-to-bell schedule, with a shorter variant. A full 75-minute block and a 50-minute variant with an explicit “what to cut” plan, so the same packet works whether the sub gets a full period or a shortened one.
  3. A warm-up (about 10 minutes). A short, graded review set — mixed math skills, a reading warm-up, or a grammar/vocabulary set depending on subject — with its own answer key.
  4. A core task (about 30 minutes). The main reading, problem set, or activity of the day, built so a student can do it without new instruction from a teacher who isn't there — plus a full worked answer key.
  5. A second graded set (about 20 minutes) and an exit ticket. A second round of graded work, then one short question that shows the sub (and you, the next day) what actually got done — plus a fast-finisher activity for early finishers.

A printable checklist for the day before you're out

A worked example: does the timing actually fit?

Take the pieces above and add them up against a real 75-minute high school block: a 10-minute warm-up, a 30-minute core reading or task block, and a 20-minute second graded set add up to 60 minutes of graded work. That leaves 15 minutes inside the period for the first-five-minutes opener, the exit ticket, and transitions between sections — the schedule fits with room to spare, not a packet that runs long and gets abandoned halfway through.

Honest limits

A sub day is not a unit. A single day's packet — even a well-built one — covers one lesson's worth of content in one subject; it is not a substitute for planning ahead of a multi-day absence, and it does not track long-term progress the way an ongoing unit does. A well-built day still depends on a sub who reads the first page before the bell rings, and on a class willing to follow a signal they've never seen before. No packet fixes a genuinely difficult class on its own.

FAQ

Where's a ready-to-go high school sub day I can just print?

A built Grade 9 day exists for Math, Science, and English, each a full 75-minute (or 50-minute) block with its own warm-up, core task, second graded set, exit ticket, and full answer keys. Buying all three as a 3-day set covers a week where three different classes each need a day covered — priced about 20% below the three singles.

What should a high school sub plan actually include?

At minimum: a “first five minutes” script, a real bell-to-bell schedule (with a shorter variant), work students can complete without new instruction, a full answer key, and a teacher-return page so you know what actually happened while you were out.

Does a single day's sub plan cover a whole unit?

No. Treat a single day's packet as exactly that — one day, one subject, one class. It fills the gap for a single absence; it doesn't replace planning for a longer one.

Can the same packet be used for two different periods on the same day?

A well-built one is designed for that: independently-numbered versions of the core task (different numbers, same skill) so two sections on the same day aren't just comparing answers.

What if the sub only gets a 50-minute period instead of a full block?

Look for a packet that prints an explicit “what to cut” plan for a shorter block, rather than one built for only one length of period. Cutting the second graded set first (not the core task) is the usual move.

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