I don't have a definitive answer but I can tell you, the shells and drum heads do tend to contract and expand based on temp. I have about a dozen antique calf skin-wood shell snares on a rack in my bedroom near the window and at night when the temp drops in teh fall and winter I hear cracks creaks and pops all night. Not sure if this will cause issues over time but I know it does have some effect on them.

Should not affect them. You must expect to retune when setting up in the spring. Hot and humid are the worst conditions for wood.

The glue freezes and becomes brittle , the drums can warp , the pies will tarnish , and chrome will rust....

I have a insulated and heated garage as my studio...

It's best not to subject any drum to major difference in temperature or humidity, if possible...

Cheers

Are they cased ? Between gigs could be minutes. Hours. Weeks. Months. Abuse. Decades. Millennium.

If they`re in cases, maybe covered with an old blanket, if your gigs are frequent, you`ll be fine.

Yes they are in Protection Racket padded cases. Frequency between gigs will typically be 3-4 weeks. I’m thinking it might be best just to take the extra five minutes and a few more trips down the basement steps and keep them inside. Thanks everyone for the advice and opinions.

Good choice!!

Cheers

Yes. Take them into the conditioned space. Even if you leave them in your car overnight, and they freeze, you would need to let them warm up to equalize with the ambient room temp before playing them....

Now on the flip side , if the bags are air tight , condensation will set in , so let them puppies breath , to avoid warping , rusting , and ply separation ...

Key here is controlled environment....