A winter pour rarely goes wrong at the truck. It goes wrong at 3 am, two nights later, when the temperature drops further than anyone checked and the blankets are still on a pallet at the yard.
Scheduling cold weather concrete is less about the pour day and more about the days after it. Treat that protection window as part of the task, and most of the trouble goes away.
When "cold weather" starts
The ACI guide to cold weather concreting (ACI PRC-306) uses a wider definition: cold weather exists when the air temperature has fallen to, or is expected to fall below, 40°F (4°C) during the protection period.
So a sunny 55°F Tuesday can still be a cold weather pour if Thursday night is forecast at 30°F. The real question is the overnight lows for every day the slab needs protecting.
Your spec, engineer and supplier set the actual temperatures and curing times. The schedule just has to give them room.
Make protection part of the pour task
On a summer job, "pour slab" might be a one day task with stripping a few days later. In winter, split it into pieces you can see on the plan:
- Prep and inspection: subgrade checked, forms and rebar signed off, ground not frozen.
- Pour: the placement itself, sized to what the crew can finish and cover.
- Protection window: blankets, enclosures or heaters in place, with someone named to check them.
- Strip and next trade: form removal and whatever follows, dated after the protection window ends.
The Michigan Concrete Association quick guide for 2026 puts it plainly: keep the concrete at 50°F or above for at least the first three days, and never place it on frozen ground. If that window is not its own task, the next crew gets booked on top of it.
Check the forecast for the whole window
Check the forecast when you book the pour, about three days out, and the afternoon before. Each time, read the lows for the full protection window.
Agree a go or hold rule with your supplier in advance. If the window looks bad, hold the pour and move the tasks behind it together. Our guide to planning weather delays into the schedule covers how to keep a few float days in the plan for exactly this.
Pour early and pour smaller
Tennessee DOT's cold weather best practices advise scheduling pours for the warmest part of the day. In practice that means first trucks early enough that finishing wraps up while the sun is still on the slab, not at dusk.
Size each placement to what the crew can place, finish and cover before the temperature drops. Two smaller pours on two good days usually beat one big pour that ends in the dark with half the blankets still folded.
Stage the gear as a dependency
Blankets, heaters, fuel and thermometers are not "bring if needed" items in winter. Make them a task that must be done before the pour can start, with an owner and a date, the same way you would treat an inspection.
Book rented heaters when you book the trucks. When the gear task is linked to the pour, nobody can mark the pour ready while the gear is still missing.
Push the work behind it, all at once
Cold slows curing, so form stripping, loading and the next trade often move back. The mistake is moving the pour and leaving everything after it where it was.
Link the tasks with dependencies so that a moved pour shows every task it affects. Then check your 3-week lookahead and confirm each affected crew knows its new start before Friday.
Putting it on one plan
Build each winter pour as a short chain: prep, pour, protection window, strip, next trade, joined by dependencies. Assign the gear task and the protection checks to named people, and let the site crew open the same plan on their phones.
Zace gives you task dependencies, Gantt charts, milestones and task assignment, on web, Android and iOS. When the forecast moves a pour, you update the plan once and the crew sees the new dates on site.
Frequently asked questions
What counts as cold weather for concrete?
The ACI guide to cold weather concreting treats it as cold weather when the air temperature has fallen to, or is expected to fall below, 40°F (4°C) during the protection period. Check the lows for the whole protection window, not only the pour day.
What time of day should you pour concrete in winter?
Schedule pours for the warmest part of the day. Start early enough that placing, finishing and covering are done while temperatures are still up, rather than finishing at dusk.
How do I schedule work after a cold weather pour?
Put the protection window on the plan as its own task and link form stripping and the next trade to it with dependencies. If the pour moves or curing runs long, you can see every task that has to move with it.
Plan the days after the pour as carefully as the pour itself, and winter concrete stops being a gamble.
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