Background: Adolescents frequently miss breakfast which may impact cognitive, academic, and health outcomes. This analysis describes the effect of a trial to assess school level changes to increase breakfast consumption on grade point average (GPA). Methods: Sixteen rural Minnesota high schools were randomized to a policy and environmental change intervention or delayed intervention (control) group. Baseline screening identified, randomly selected and enrolled 9th and 10th grade students who eat breakfast =3 times per school week for assessment. Mean unweighted GPA was provided by 13 schools for 636 students. Student-level and administrative data were used for sociodemographic and free or reduced-price meals (FRPM). Linear mixed models and latent class analysis (LCA) were used to assess change in GPA. Results: Students were 54% female, 76% white, and 34% received FRPM. Unweighted cumulative GPA mean = 2.82 (0.78) at baseline. There was no significant intervention effect on GPA postintervention or 1-year follow-up. LCA revealed two classes: "higher" (N = 495) and "lower" (N = 141) resource. There was an intervention effect among low-resource students from baseline to 1-year post only among the control condition (delayed intervention). Conclusions: In combination with the full study results, increasing breakfast consumption may have an impact particularly for low resource students.