When Do Sub Jobs Actually Get Posted? The Weekly Rhythm, in Data
School is back, and the numbers show it. Across the districts we watch, new job postings roughly tripled in the past week — from about 700 a day to well over 2,000. Wednesday was the single biggest posting day we've ever recorded: more than 2,500 new jobs in one day.
If you're subbing this year — or thinking about starting — the next few weeks are when calendars fill up. And it turns out the week has a rhythm. Once you see it, you can stop checking Frontline at random and start checking it when it actually matters.
Sunday evening: the week quietly begins
Weekends look dead, and mostly they are — until Sunday afternoon. In our data, more than half of Sunday's new postings appear after 3 PM. That's teachers sitting down to plan their week, realizing they have an appointment Tuesday, and entering the absence before dinner.
Here's the useful part: jobs posted over the weekend mostly sit there. Nobody is racing you at 8 PM on a Sunday. It's the one time in the whole week when a person casually browsing has a real shot at the pick of the litter.
The 6 AM scramble
Monday through Friday, the biggest wave of postings hits in the early morning — teachers waking up sick and calling it in. These jobs need someone today, and every sub who's awake knows it. Anything posted between 5 and 8 AM gets competed for hard, and the evening-and-weekend backlog gets swept up in the same rush.
If you're a manual checker, this is your second-best window — but only if you're actually at your phone when the job appears, not twenty minutes later.
The school-day disappearing act
Postings don't stop when school starts — tomorrow's absences get entered all day long. But mid-day is when competition is most brutal: in our measurements, during school hours, half of new postings are claimed within about a minute. By the time an email alert lands and you open it, the median job is already gone. (We wrote more about that race in The 60-Second Window.)
Evenings: posted tonight, gone by breakfast
Jobs posted in the evening typically survive the night — and then get consumed in the next morning's scramble. So an evening posting is genuinely catchable by a human… as long as you see it tonight and not tomorrow at 7:45 AM, when everyone else does.
So when should you check?
If you're doing this manually, the honest playbook is:
- Sunday evening — the best browse of the week. Low competition, fresh postings for the coming days.
- Early weekday mornings (5:30–7:30 AM) — the biggest wave, but also the fiercest competition.
- Weekday evenings — tomorrow's absences, posted tonight, before the morning crowd sees them.
And one more thing worth knowing: this varies a lot by district. In some districts, jobs regularly sit for hours; in others they're claimed in seconds at any time of day. We're collecting that data now and will publish a deeper look soon.
The honest ceiling
The rhythm helps, but it doesn't change the physics: the most desirable jobs, in the busiest districts, at the busiest hours, are gone in under a minute. No checking schedule beats that — it's an alerts-and-speed problem, not a diligence problem.
That's the problem Sub Hero was built for: it watches Frontline continuously, notifies you the moment a matching job posts, and — on the Pro plan — can accept a job for you within seconds of it appearing. It won't solve everything, but it turns "be lucky at 6 AM" into "get a push notification and tap once."
Learn more: app.getsubhero.com
Plans start at $6.99/month. Works with Frontline Absence Management. If you set it up this weekend, you'll be watching before Monday's scramble.