At what temperature does antifreeze freeze?

This may sound like a weird question but can antifreeze freeze? I live in Alaska I was going to keep my antifreeze out in the garage but it gets pretty cold out there. If it does freeze, what temperature does it freeze at?

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Answer provided by
Patrick Price
Answered on Apr 28, 2022
Great question! This is something that there are probably a lot of misconceptions about, given the name. The answer is yes–antifreeze (like every substance in the universe) does have a temperature at which it will freeze. Pure antifreeze will freeze at around -5 degrees Fahrenheit.
It should be made clear though, that antifreeze and coolant are not the same things–even if the terms are often mistakenly used interchangeably. This is relevant because the two substances have different freezing points.
Coolant is what you actually end up putting in your car. Antifreeze is the pure and undiluted form of coolant. To make coolant, you combine antifreeze and water into a 50/50 mixture.
As strange as it sounds, adding the water to antifreeze actually lowers the freezing point. Coolant won’t freeze until temperatures hit -35 degrees Fahrenheit. So if you’re hoping to store it somewhere cold, it’s best to mix your antifreeze with water to make coolant before storing it.
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