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I have left bottled water in a car over night in the mid teens, and was really cold the next morning, but not froze, so how low would the temps have to be to freeze an MRE in a car? Or is this even an issue?
I try to leave some emergency food in my vehicle in the winter, but it's mostly protein bars, or other snacks, and thinking about adding a few MREs.
The temps generally do not get lower than around 15 to 18, but once in a while might get around 5 to 10 degrees, and generally heat up to 20s or 30s during the day. This is probably the most extreme of the low temps.
Another reason I ask, is when I retire in a couple years, I am wanting to visit Alaska for a few months and see the sights and scenery, and things may be left in vehicle for a few days at times.

Even if the Mains in the MRE freeze, they are designed to be unfrozen by putting them into one FRH and then put in another FRH to get them up to eating temperature.
So as long as you have some spare FRHs you will be golden.

I would spend the extra few bucks and get some Meal, Cold Weather or Long Range Patrol rations instead. The entrees are freeze dried, taste better, are lighter and last longer. Ultimately, you'd save money in the long run because you wouldn't have to swap them out as often. MREs can get a bit weird throughout the years if you're in an area that has a change of season from hot to cold.

The MCWs are easier to find than the LRPs and there's little difference between them as far as I can tell. I think either will work fine.

Thanks for the replies.. it helps a lot in my planning.