Carl Sandburg's "Fog," Robert Frost's "Dust of Snow" and Emma Lazarus' "The New Colossus" are all poems that are appropriate for teachers to use in a fourth-grade classroom. As of 2015, each poem is listed in the Common Core State Standards for English language arts.
Each poem is fairly short but loaded with strong imagery and symbolism. In Frost's "Dust of Snow," the speaker comments on a moment when a crow on a hemlock tree shakes snow onto him. Sandburg's "Fog" describes a passing fog as though it is a living creature with consciousness. Lazarus' "The New Colossus" discusses what the Statue of Liberty represents to immigrants who come to the United States.