This study investigates the reading performance of younger students with intellectual disabilities to gain insight into their needs in reading education. Participants were 428 students in Grades 1 to 3 in Sweden. They performed LegiLexi tests measuring pre-reading skills, decoding and reading comprehension based on the model of Simple View of Reading. Results demonstrate a great variation in reading acquisition among students. Some students are able to decode single words and read shorter texts with comprehension already in Grade 1. Other students still struggle with learning letters and developing phonological awareness in Grade 3. According to their longitudinal data over grades, results show that most students progress in pre-reading skills, decoding, and reading comprehension. Hence, assessing reading skills among students with intellectual disabilities in Grades 1–3 using tools aligned with the Simple View of Reading seems applicable and informative for teachers. This study underscores the significance of informed instructional practices for empowering these students in reading education.