We recommend getting outside even if -20C and colder, if you can. But make sure you dress properly:

• Layers – better to dress in 2-4 thin layers than a couple of thicker layers
• Make sure the last, outside, layer is wind resistant
• Protect the extremities:
  • Cover hands with mitts, NOT gloves
  • Use thin(ner) wool socks, not synthetic or cotton socks
  • Cover the head and neck – toques and Buffs (neck tubes)
• Wool is best – wear wool blend underwear and socks
  • Wool holds its heat even when wet – retains its insulative properties
• Avoid cotton underwear and socks – cotton when wet loses its “warmth” or insulating properties
• Use technical wear designed for skiing and being outdoors
• Wear a couple of sets of of underwear when -15C and colder
• Cover your neck with a Buff:
  • 1 Buff when +5C and colder;
  • 2 Buffs when -10C and colder
  • 3 buffs when -15C and colder
• Wear a couple of thin toques when -15C or colder (Or a toque and a headband)
• Avoid thick, bulky clothing – this will make moving difficult and likely cause you to overheat
• Make sure exposed skin is at a minimum
  • Typical areas are ear lobes, cheeks, and your nose
  • Have buddy check for white spots (frostbite)
    • Place and hold the palm of your mitt-less hand over the affected area.
    • Get inside ASAP if affected.
• Wear booties over your ski boots – alternatively, use an old pair of wool socks and slip over your boots
• Use clear lens glasses in the dark to protect your eyes – Note: These may fog up
• Bring a set of dry clothes to change into afterwards – especially socks and top
  • Wool sweater with a high neck is best!!

And finally, don’t go hard in the cold, but go at a Zone1 pace 

Stay warm, dry, and keep moving!!