You've been sick since mid-afternoon. Tomorrow is a school day. You need a sub plan.
Writing substitute plans when you're healthy is already something most teachers put off. Writing one at 8 p.m. with a fever is one of those moments where teaching asks more than any job should. This guide is built around that reality: the night-before, last-minute sub plan that needs to be functional even though you're not at your best.
What a Sub Plan Actually Needs to Do
A substitute who arrives at your classroom on short notice needs to know four things: where things are, who the students are (at least the basic management picture), what they're supposed to do in each period, and what to do when something goes wrong. Everything else is detail. Most sub plans fail not because they're too short but because they're missing one of these four things entirely.
The most common failure point is management information. Teachers write detailed lesson plans but forget to mention that third period has a student who needs a brief break every 45 minutes, or that the noise level in the room is usually regulated by a specific expectation the sub won't know. A substitute can improvise instruction. They cannot improvise student management protocols they don't know exist.
The Five-Part Structure That Works Every Time
When you're sick and don't want to write from scratch, this structure covers everything that matters.
Part 1: Logistics. Attendance procedures (paper form, digital system, which system your school uses). Where the emergency procedures are. Who the neighboring teacher is and whether they're a reliable resource. Bathroom procedures. When specials/lunch/recess happen, and whether supervision transfers to another teacher.
Part 2: Class-by-class schedule. For each period or class group: what they're working on, where the materials are, approximately how long each activity should take, and what to do if the class finishes early. If you have the same subject multiple periods, you can write instructions once and note "same for period 3 and period 5."
Part 3: Student notes. Two or three sentences, no more. Who might be challenging and what helps. Who the reliable student helpers are if the sub needs to locate something in the room. Anyone with medical needs or IEP accommodations the sub must know about (keep this high-level and separate from what goes in formal IEP documentation; this is operational, not official).
Part 4: Materials location. Sub folder location. Worksheet copies location. If anything is in Google Classroom, a brief note on where to find it. The simpler you can keep this, the better. A confused sub in the copy room at 7:50 a.m. is not going to serve your students well.
Part 5: End-of-day instructions. Where to leave a note for you. Whether students pack up independently or need to be dismissed. Any after-school duty the sub may need to cover if you have one.
The Activity That Travels Well
Sub plans work best when the activities are ones a student can manage with minimal teacher input. Independent reading, review worksheets on recently taught content, journaling prompts, silent work on an ongoing project. These aren't necessarily the most instructionally rich activities you'll do all year, but they're the ones a substitute can manage without deep subject knowledge.
The mistake is assigning a lesson that requires the sub to teach new material. A substitute who teaches your long division introduction incorrectly is worse than a substitute who supervises students practicing last week's long division independently. Plan for the latter.
If you know your absence is coming (pre-planned leave, scheduled appointment), the sub plan activity can be more ambitious because you can prep materials and leave clearer instructions. The last-minute sick-day plan should default to review and independent practice, not new instruction.
The "Sub Folder" That Saves Future You
The single most effective sub plan strategy is building a standing sub packet early in the year and keeping it current. This is not a full lesson plan; it's the logistics layer that never changes: classroom procedures, management notes, attendance, emergency contacts, schedule overview. When you build this in September, you're doing most of the sub plan work once for the entire year.
What changes from absence to absence is just the day's activities. With a standing logistics document already complete, writing the actual day-of instructions drops to 15 minutes even if you're sick. You're filling in one section, not rebuilding the whole structure.
The teachers who handle last-minute absences most smoothly are the ones who have this standing document and update it whenever their class procedures change. When the school switches to a new attendance platform in January, the sub packet gets a two-sentence update. When a new student joins the class with specific needs the sub should know about, that gets added. It's a living document maintained in small increments, not a project.
A Note on What Sub Plans Can't Do
No sub plan will make a substitute as effective as you in your classroom. The goal of a good sub plan is not to replicate your teaching; it's to give students meaningful work to do, give the substitute enough information to manage the room, and protect the instructional continuity of your class enough that you don't spend the day-back doing remediation.
Teachers who expect sub plans to produce learning equivalent to their own teaching are setting an unreachable standard and writing plans that are too complicated for a sub to execute. Teachers who expect sub plans to maintain order and productive work are usually satisfied. Know which outcome you're planning for.
Using Teacher's Buddy for Sub Plans
When you generate a sub plan in Teacher's Buddy, the starting point is your existing lesson context, your class profile, and the activity type that works best for unsupervised periods. The output is a draft in the five-part format above, adjusted for your specific class. You edit, add your management notes, and you're done.
This is useful precisely because it handles the blank-page problem when you're sick. Generating a draft to edit takes less cognitive load than building from scratch. For the teacher who could not possibly write a coherent sub plan from a blank document at 9 p.m. on a Tuesday, a solid first draft is not a luxury. It's what makes the difference between submitting a real plan and submitting nothing.
Writing a good sub plan when you're sick is not about being exceptional. It's about having a structure in place before you need it, and having a starting point when you do.