If a heated hangar is not available, the airframe requires special attention as well. An overlooked icicle could ruin your whole day. If a heated hangar is not available you may need to deice the plane. You can purchase covers for the wings and empennage and they can save you hours of time in deicing an airplane at below-freezing temperatures. Allow plenty of time.
Airplanes have a lot of surface area.
If you have cooked in the mountains you know that boiling or steaming food at high altitudes takes longer because water vaporizes at a lower temperature. The same holds true for avgas. It is difficult to hot start some fuel injected engines at sea level because the heat from the engine causes vapor lock in the injection lines. That problem is magnified in the lower ambient air pressure at high altitude airports as the fuel vaporizes at a lower temperature. Be sure that you have your hot-start procedures down cold.