An adjustable auger assembly for a trencher including an auger housing and a position attachment assembly. The auger housing having a central auger tube having a first end and a discharge end opposite the first end. An auger shaft is positioned within the auger tube and is rotatable relative to the central auger tube. At least one material inlet is positioned one of at the first end and between the first end and the discharge end. The position attachment assembly has a first component member coupled to the trencher, and a second component member coupled to the auger housing. The first component member is movably positionable relative to the second component member, to, in turn, adjust the position of the auger housing relative to the trencher.