Good vector fidelity is crucial for various multicomponent applications and can be adversely impacted by poor sensor coupling during data acquisition. We present a method to evaluate the ground coupling quality of three-component (3C) sensors during field deployment using ambient seismic noise data. The method utilizes the directional nature of the noise on the three sensor components for coupling assessment. This is believed to be the first method developed to evaluate in situ sensor coupling from ambient noise measurements.