The invention relates to a method for monitoring a static and/or dynamic stability of a wind turbine. The wind turbine has a tower, a nacelle, which is supported by the tower, and a rotor, which is mounted in or on the nacelle and has at least one rotor blade which can be adjusted about its longitudinal axis. The method includes the following steps: the wind turbine is excited to oscillate in at least one direction. A frequency (fm) of the excited oscillation is detected. The detected frequency is compared with a predetermined frequency (fref) and an alarm signal is generated if the detected frequency deviates from the predetermined frequency by more than a difference value (Δf).