A storage tray populator configured to populate a storage rack with a plurality of biological sample containers is provided. The storage tray populator may include a randomizer configured to receive the biological sample containers and randomly distribute the biological sample containers. Further, a transport apparatus may transport the biological sample containers from the randomizer to the storage rack. Additionally, a controller may control at least the transport apparatus. Thereby storage trays may be populated, and access to a desired biological sample may be improved. Methods for populating storage racks with a plurality of biological sample containers are also provided.