ORIGINAL: opjose

Your biggest problem will be humidity changes that go hand in hand with temperature changes. This can cause the wood to warp or weaken over time.

''Bag'' your models in tightly closed plastic bags when you put them up for long term storage.

That will prevent the wood from getting dried out or overly wet, and also prevents bugs and critters from attacking the balsa.

If the weather is going to get down below 40, you can also leave a light bulb on in your shed preferably towards the ground. It provides just a bit of heat which is often enough to make the difference between freezing or not.