Geoforensic analyses complement archaeological resource crime investigations, cultural resource damage assessments, and other investigations involving sediments. Civil and criminal litigation may hinge on attributions of sediments recovered from persons, equipment, objects, and localities to specific source deposits, including altered cultural resources. Geoforensic fieldwork often entails fluid interplays among geological, archaeological, and investigative factors, and few scientists have experience working in such contexts. Geoforensic specialists may be tasked to swiftly investigate unfamiliar regions to obtain representative specimens and to present expert reports grounded in scientifically reliable principles and methods. For these reasons, systematic preparation is needed to improve geoforensic fieldwork effectiveness and efficiency. We present recommended procedures and field-tested assets for five pre-fieldwork steps: (1) commit to the teamwork, discretion, and professionalism required for crime scene investigation and case resolution; (2) gather geological and archaeological background information; (3) assemble the sediment sampling tool kit; (4) prepare sediment sampling documentation and specimen collection forms; and (5) obtain necessary permits and law enforcement, landowner, or attorney guidance for participation in crime scene reconnaissance, survey, or resurvey. Completion of these five steps will optimize the prospects for geoforensic contributions to cultural resource damage assessments and to just resolution and remediation of unauthorized cultural resource alterations.