An adjustable occupancy sensor capable of being secured to a light fixture includes a housing having a side and a bottom, a sensor assembly attached to the housing at the bottom of the housing, and an adjustable mounting assembly provided on the side of the housing. The adjustable mounting assembly includes a slot defined in the side of the housing and a track having a plurality of segments extending along the length of the track. The track is configured to be releasably secured to the side of the housing within the slot, the plurality of segments being configured to be breakable from the track to adjust a length of the track. The adjustable mounting assembly further includes a connector molded or otherwise secured to the track to connect the housing of the adjustable occupancy sensor to the light fixture. Other embodiments and methods are disclosed herein.