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Classroom physical activity breaks (CAB) are beneficial for increasing children's physical activity (PA) levels as well as the amount of time spent being on-task within the classroom. Purpose: To examine the effect of CAB at different times within the school day on on-task behavior and PA levels in primary school (grade 1-3) children. Methods: Thirty-five children (6 ± 1 y, 22 = male, 13 = female) participated in four conditions in a randomized order: morning (AM), afternoon (PM), morning and afternoon (BOTH), and no CAB (CTRL). CAB followed a traditional Tabata format of 20 s work and 10 s rest repeated 8 times for a total of 4 min. PA levels were monitored (accelerometry). On-task behavior and three types of off-task (motor, verbal, passive) were recorded following each CAB (mobile application). Results: When compared to control, AM, PM, and BOTH increased on-task behavior AM: Δ10.4%, PM: Δ10.5%, BOTH: Δ14%; p 0.67, p < .001). Students achieved an additional 8.4 (p = .070; d = 0.93), 12.2 (p < .001, d = 0.49), and 6.3 min (p = .09, d = 0.47) of moderate-vigorous physical activity (MVPA) over 24 h following a CAB vs CTRL in AM, PM, and BOTH, respectively. Additionally, performing any of the CAB conditions increased the number of steps taken during the school day by an average of 2007 steps (p < .009). Conclusion: Overall, these results demonstrate that CAB improve both on-task behavior and PA levels, regardless of time of day. However, performing two CAB (BOTH) is recommended to derive the greatest improvements in on-task behavior across the school day.