Bike storage - in the cold

So with the impending arrival of something new for me, I will most likely have to turf out a bike from the shed... I plan to build a water/windproof shelter for it in the garden (secure) but will it being exposed to more cold than I. The shed be a problem? Its a simple hardtail with bog spec bits on it.
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Giant Trance
Radon ZR 27.5 Race
Btwin Alur700
Merida CX500
Every morning once the temperature reaches dewpoint you'll get water droplets form all over the bike as the building won't be heated. Not a problem, but like mentioned, bolt heads etc may rust.
Fully aware of dew point etc.
Bolt heads are already lightly corroded so that's all good.
Scandal
Felt Roadie
Evil Sovereign
Santa Cruz Heckler (gone)
On One Inbred (gone)
Ragley Mmmbop (gone)