Can You Pour Concrete in Cold Weather? The 40°F Rule
When the air is at, or expected to fall below, 40°F during the protection period, it is cold-weather concreting. Do not place concrete on frozen ground, and keep the slab protected until it gains early strength.
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Transcript
Can you still pour concrete in cold weather? Yes, but only if you protect it. The industry line is 40 degrees Fahrenheit. When the air is at, or expected to fall below, that temperature during the protection period, it's cold-weather concreting. Do not place concrete on frozen ground. Ask the plant for a mix suited to the temperature. Cover the slab with insulating blankets as soon as you finish, especially the edges, which lose heat first. The concrete has to stay protected until it gains early strength, so it doesn't freeze while it's still young. Read the cold-weather guide, then find a local ready-mix plant, at concretenear.com.
Photo credits
- A night pour from a volumetric mixer (Volume Concrete). Volume Concrete / Record of Sale LLC · Used with owner permission (Ryan Standley / Volume Concrete) · Volume Concrete original photograph (night-highway-volumetric.jpg).
- A concrete deck under a curing cover. Oregon Department of Transportation · CC BY 2.0 · File:Exit 6 southbound bridge deck curing (51418228769).jpg · attribution required.
Original teaching diagrams drawn in Python (PIL/NumPy). No AI-generated imagery. Music: none.