Some really good advice and thoughts. Thanks everyone for taking the time to reply.
Say again s l o w l y: Why not get the aircraft fuelled the night before, do your preflight checks in the hangar, then just pull it out and go if you are worried about the aircraft icing up whilst parked outside. Don't mess around with icing. If it's below freezing on the ground, then do everything you can to avoid getting any moisture on the aircraft.
Yes, I agree and will see what I can do.
mary meagher: Interesting flying gliders in this weather - if it is below freezing when we get them out of the hangar, they frost up pretty quickly.
This is a concern I already had. How can I predict the likelihood of this in advance? Thanks.