We parked our helicopters outside in Alaska all year long unless they were in the hanger for maintenance. A good set of covers is money well spent as they protect the glass, engine and rotorhead from sun and rain. Blade covers can be made with a layer of foam on top to prevent hail damage as well as eliminating the need for deice if they get snowed on or freezing rain. Tail rotor blade and gearbox covers should be included as well as main rotor and tail rotor tie downs to protect damage from strong winds.