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Abstract Background We present a case report on the efficacy of the short‐term application of vortioxetine in managing winter depression in patients with seasonal bipolar disorder (BP). Standard treatment strategies for BP may not adequately address seasonal depressive symptoms during winter in patients with seasonal BP patterns. Depressive symptoms during winter may be linked to seasonal changes in serotonin transporter binding, such as a decrease in synaptic serotonin levels, necessitating alternative approaches. Although antidepressants, including vortioxetine, are effective in treating seasonal monopolar depression, their efficacy and safety in treating depression in patients with seasonal BP patterns remain unclear. Case Presentation This case report focuses on a 44‐year‐old male patient diagnosed with seasonal BP who had recurrent depressive episodes, specifically during winter. Notably, the patient had a significant decrease in recurrent episodes after short‐term seasonal vortioxetine use without inducing mania or rapid cycling. Conclusion Our study highlights the potential effectiveness of a seasonal, short‐term treatment strategy with antidepressants, including vortioxetine, for winter depression in individuals with BP.