A foldable vehicle undercarriage barrier assembly provides a frame that carries a foldable panel. The panel positions between the undercarriage of a vehicle and a ground surface in a friction fit relationship, so as to help restrict ingress of snow, debris, and small animals beneath the vehicle undercarriage. The panel positions perpendicularly to the ground surface, forming a barrier between the undercarriage and ground surface. The panel is vertically and horizontally expandable to accommodate different vehicle sizes and types. The panel has a joint to enable foldability. The panel comprises a handle for facilitating folding and carrying of the panel. The panel is supported by a length adjustable support pole that braces against the undercarriage or a wheel when deployed. The panel is also defined by at least one sight hole to enable viewing the space beneath the undercarriage, and verify proper alignment of the panel to the undercarriage.