[Nebs]

Unlikely. Unless you try to shoot them while they're still at -20*F.

 

[AAtrap]

Nope. Not if they were kept dry.
Steve

 

[grizquad]

I store mine in my unheated garage winter and summer, and they are fine

 

[Tripod]

Thanks all fr the prompt replies!

 

[redudley]

Heat, temps above 120 deg F, can cause issues with powders and moisture can corrode/damage your shells.

 

[heebs]

As long as they are dry, no problems. Hit them all!

 

[DuckNut]

Give me your address and I can make arrangements to get them to sunny Florida.

 

[hallnh]

I started storing mine in the garage in Indiana and have not had any issues in the last 14 months.