i personally would wait for the cold to come through as long as there is no rain... otherwise pick them right before they would get rain, but keep them out there as long as u can, they could double is size and weight in the next 4-5 days. as for the cold, 24 hrs of cold will help bring any photo systhsis to a stand still they get picked and u dry them and it should work out perfect for u.

any rain or snow will be a cause for possable bud rot.