Are letters sent via airmail exposed to freezing temperatures?

I'm in Canada and I want to buy frost-tender flower seeds from UK. Should I risk it?

Are letters sent via airmail exposed to freezing temperatures?
It's very likely that the temperatures inside the hold of airplane are close to freezing. Now I say likely because the outside temperature at altitudes can be oh -60°F or so. Also, I have never had frozen toiletries, pets survive, and some very quick web searches say the same.



Your seeds could probably be packaged in such a way that they are protected during the flight (large box, foam packing, etc)..



The real danger is sitting on a tarmac in some obscure location while not in flight. sometimes packages are unloaded and left in the open while waiting for loading onto the next flight. I've shipped boxes to japan that spent 24 hours sitting on a tarmac in Anchorage Alaska for example.



The shipper can request special handling like temperature controlled shipment. Good luck.
Reply:The temperature in the cargo area may go below freezing, but it will not hurt the seeds. Frost tender means do not plant them until all chance of frost has passed. Seeds usually go through winters before they germinate.