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The majority of the time this is due to the "Cold Cranking Amps" in your battery. Most batteries are only good until it gets down to a certain temperature. After the temperature reaches or goes below the minimum temperature, the car isn't going to start. Generally speaking, the battery will tell you on it's sticker or label how many "Cold Cranking Amps" your battery has (aka CCA Rating), and what temperature is the minimum temperature the car will be able to start at. Most of the time, it's limited to 0oF.

More information:

There may be water mixed with your fuel. water + cold = frozen fuel. get some HEET from a local gas station to remove water from your fuel during the cold months.

If your car is Diesel it maybe that the GlowPlugs are not working.

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Q: Why won't a car start when it's cold?
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