当Greg Heffley的中学因大雪而停课时，他所在的社区变成了一个冰雪战场。敌对团体争夺地盘，建造巨大的雪堡，并展开史诗般的雪球大战。身处战火之中的是格雷格和他忠实的好朋友Rowley Jefferson。

When snow shuts down Greg Heffley's middle school, his neighborhood transforms into a wintry battlefield. Rival groups fight over territory, build massive snow forts, and stage epic snowball fights. And in the crosshairs are Greg and his trusty best friend, Rowley Jefferson.