i think you should be okay, i got my seeds from judy last week and the seeds had to come from tennessee, the seeds were delivered from our canada postal service via usps. i would imagine at some point in time the package had to have sat in the belly of a cargo plane. then transported in a cold vehicle from airport to canada post sorting plant. once sorted the package would have been delivered by handi bus type vehicle to an outside green box. the package sits until the sleepy postal carrier decides he feels good enough to work where he then picks up the sorted packages from the green box and walks them door to door and they sit in his carrying pouch.
during that period we were experiencing -20C to -30C temperatures.
(you can do a post search as someone asked this question once before, either last year or the year before).
my seeds are in the germination chamber, i soaked them in water overnight, planted some in promix and some in rockwool as an experiment. the rockwool seeds will end up in my dwc(which i may have to make another), the promix will be potted. they hit their bed dec 14 and none have sprouted yet. they are all super hotties, so I am expecting a lengthy germination period.