I have to say it, shouldn’t matter one bit on any decent bass, period.
If your bass shatters like a frozen glass put under running hot water, the bass is the problem, not the temps. Send it back.
So if your gear is in the trailer for a few hours in freezing temps, and you get to an indoor gig, you make the client wait 24 hours?
Thought not.
This is why none of this unboxing makes sense to me. A good long drive to a gig is plenty of time to make that bass in your trunk or truck bed get rather cold. I usually give it a little time to come up to temperature before playing it, but that's for my hands and not the bass. Usually it's warm by the time we are done setting up.
We used to keep all our stuff in a private rehearsal audio that wasn't heated when people were not there. My jazz stayed there plenty of times and got warmed up for rehearsals as necessary. It's the same bass I use today and it never cracked, exploded, warped, developed dead spots or any other weirdness.
