Can speakers be stored in a garage?


I'm putting my stereo up for a while. Everything is boxed up in factory boxes and packing.
There is no place inside our townhome to store it. If I put the boxes in large plastic bags to prevent humidity from entering the boxes can I store it in our detached garage for a long time? This applies to the speakers, electronics and turntable.
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I have stored speakers and amps in my unheated garage, low humidity, for years with no problem. You should be fine.
It may depend on where you live, I certainly wouldn't in New England if they had any value. 
I would not store anywhere subject to wide temperature swings. Also of course needs to be secure from thieves.