Dialogic reading (DR) is the shared reading of storybooks, interspersed with dialogues about story and illustrations. Previous findings have indicated that DR can be adapted for children with autism spectrum disorder (ASD) and can improve their engagement in shared reading activities. The present study aimed to investigate how DR with a verbal prompting hierarchy impacted the performance of children with ASD engaged in dialogue about the story. We also measured effects on verbal and non-verbal initiations and on task engagement. We used a single-subject design to test a DR adaptation involving a least-to-most prompting hierarchy with two 7-year-old children with ASD and evaluated the effects on independent verbal responses to questions about the story, verbal and non-verbal initiations, and task engagement. The participants showed an increase of independent verbal answers to WH (Who, What, Where, What) questions about the story, and to the more general “What is happening here?” (WIHH questions). One child showed an increase in verbal initiations. Both children showed high task engagement independently of condition, but with less variability when reading was dialogic. The results of this study support the use of story-based open questions and least-to-most prompting verbal hierarchies for helping children with ASD engage in conversation about the story in shared reading settings.What does this paper add? • The use of an explicit prompting hierarchy method is a step toward systematization of scaffolding strategies during shared reading.• It is possible to use verbal prompts to help children with autism spectrum disorder answer questions about the story during dialogic reading,