Foliar boron (B) is sometimes applied to canola during early flowering in the field, but the yield benefits associated with this practice are inconsistent. Prior field research suggests that B may be most beneficial to canola under heat stress. We tested the hypothesis that foliar B application could reduce heat-induced pod abortion.  In a controlled environment experiment plants of a commercial spring canola hybrid were grown under a 20 / 15 °C day / night temperature regime continuously (control), or with exposure to a 28 / 20 °C day night treatment (heat stress) for 14 d beginning one week after first flower.  Main raceme pod counts showed that foliar B applied 4 days prior to the onset of heat stress significantly (p < 0.05) reduced pod abortion; foliar B had no effect on pod numbers in control plants.  We conclude that foliar B applications can help mitigate heat stress effects in spring canola by reducing heat-induced pod abortion.