To be honest, Frost normally writes in a style that is very simple and marked mostly by the absence of figures of speech. In this poem, for example, the closest I can come to finding anything like a simile, metaphor or personification is the implied metaphor in the following quote:
He will not see me stopping here
To watch his woods fill up with snow.
Here, woods literally cannot "fill up" with snow as they are not an enclosed container. The implied metaphor compares the woods to a restricted area or a kind of massive walled-in section of land that can fill up. The implied metaphor is used therefore to exaggerate the amount of snow that is falling and how the level of snow on the ground is rising so quickly. Apart from this one example, you might want to focus on the symbolism of the poem. If you do a search for this on enotes you will find many responses.