You should avoid pouring concrete when temperatures are near or below freezing.

If the ground (subgrade) is frozen, then this creates an unstable foundation for the concrete. If concrete is poured on frozen ground, then once the ground thaws, it will settle, causing problems. Try to prevent the subgrade from freezing in the first place. This can be done with insulating blankets or straw.

If concrete has been poured in cold temperatures, it must not be allowed to freeze for at least 24 hours. Plastic, insulating blankets, or straw can all be used to keep the concrete from freezing.

If you're unsure about how to properly mix or pour concrete, consider hiring a professional who is familiar with the appropriate conditions needed.
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