If you sleep where it's below zero, keep your insulin in your sleeping bag. If you're walking around, with minus 5 it will be above freezing even in your coat pocket. Enjoy!
Hello @jamesfitz I am currently skiing so have my insulin in my pump, as I keep it close to my body then I have no issue with sub zero temperatures, so if your walking around with insulin pens just keep them to close to your body.
I was in Siberia last year (-35 at times, so really cold), and just tucked my insulin into the inside pocket of my coat, as close to my body as I could.