Previous research has demonstrated that immediate effects of language interventions tend to fade, but has also suggested that differentiating language skill types may be essential for understanding fade-out processes. This paper examines the longer-term effects of participating in a shared-reading intervention. Method The study included 464 dual-language learners (DLLs) (49.6% girls) in Norway with a mean age of 52.60 months when the intervention started. They were randomly assigned to an intervention condition receiving a shared-reading program in preschool and at home or a business-as-usual control condition. The children spoke a number of first languages and were second-language speakers of Norwegian. Children's second-language skills were assessed seven months following the completion of the intervention. We asked whether the developmental advantages induced during the intervention faded or remained when the intervention conditions were no longer present, using autoregressive structural modelling and second-order latent growth modelling to answer the question. Results While some immediate intervention effects disappeared (grammar) or showed tendencies to fade (vocabulary and perspective taking), second-order latent growth modelling suggested that narrative skills emerged. Conclusion The results demonstrate the need to consider skill type in future research on fade-out and offer a longer-term perspective on how DLLs respond to shared-reading interventions.