But can nitrous freeze? Like if it gets down to freezing at night, and theres nitrous in the lines still. Or what if the bottle gets down to freezing levels, will anything bad happen?

 

I've never heard of that happening. Nitrous has a far lower freezing temperature than water does, and it regularly goes below 32 degrees in normal operation.



I dare say if the bottle got cold enough for the nitrous to freeze, you would be having other issues first, like the interior plastics cracking.

 

I think it freezes at something like -90 degrees C. So on Earth, no concern.