shhh, if you dont talk about the cold, it might stay away! co-ops insulated bags and heat packs do a good job handling adverse weather. last year when it was nice and cold out, usps decided to get them from wash, to mn in a few days(great right), then sent them to denver for a few days, then back to mnpls for a couple days before getting them to the local post office to deliver. was a total of 10 days before they arrived, surprisingly none of the plants died, a few were stunted pretty good, but all lived.