Abstract: This invention relates to a Method of mounting a wind turbine at a mounting location, said method comprising the steps of mounting two rotor blades to a pre-assembly of hub and nacelle; lifting the assembly of nacelle, hub and two blades by means of an installation crane on top of a frame in which a third rotor blade is held in vertical position with a flange pointing up; manipulating the third rotor blade towards the hub of the assembly resting on the said frame, allowing the third rotor blade to be mounted to the assembly of hub and nacelle and two blades; lifting the completed wind turbine assembly of nacelle, hub and three blades on top of a pre-installed wind turbine foundation tower.