This study aims to identify the effects of STEM training on the academic achievement of 4th graders in science and mathematics, as well as their views about STEM training. The study group consisted of 4th graders with similar science and mathematics achievement levels from two separate elementary schools with similar socioeconomic profiles in Nigde. The study used the quasi experimental pretest-posttest control group design and focus group interview technique. The data were collected by using the Science Achievement Test, Mathematics Achievement Test and a quasi structured interview form. The results showed that STEM training affects science and mathematics achievement, students have positive views about the training, wish to see more of it in future courses, and may consider choosing STEM areas for their future careers.