On the surface, almost nothing happens here: frost forms on a windowpane and a flower is in danger. Dickinson turns that small winter scene into a siege, with sailors, mountains, a snake and a hunt. The poem is about the helplessness of people trying to shield something fragile from death, and about what remains when the fight is lost. What remains is not peace but a grief with no way out.
The frost arrives as a character who speaks. "Secure your Flower" said he, in a tone that is half warning and half taunt. The flower is never explained, but "her helpless beauty" suggests a person, and the plural "we" suggests several people watching and failing together. That reading is an inference, though the poem's force depends on it. Their effort is compared to "Sailors fighting with a Leak." The image fits well, because a leak is slow and patient, and the water does not need to win quickly. They carry the "passive Flower" to sea, mountain and sun, the gestures of people willing to try any cure. Even so, "on his Scarlet shelf," perhaps the reddened horizon of the sun, the frost begins "to crawl."
The third stanza is the poem's turning point, and its form changes with it. The lines shrink and the verbs turn physical and clumsy: "We pried him back / Ourselves we wedged." You can almost hear the effort in the blunt, one-syllable words. Then the music changes. "Yet easy as the narrow Snake / He forked his way along" glides on its soft *s* and *n* sounds, so Death moves smoothly where the humans strain. "Forked" does double work. It suggests a snake's tongue, and it also describes the branching patterns frost really makes on glass. The stanza has five lines instead of four, as though the poem's own shape has been pushed out of order.
Once the flower has "bent," grief turns to rage: "We hunted him to his Ravine / We chased him to his Den." The frost becomes a wild animal, and the people become hunters. Yet the hunt only sounds triumphant. A hunt needs something to catch, and Death has no den they can reach. The word "begun" appears twice, first for the frost's advance ("To crawl the Frost begun") and then for the humans' fury ("our wrath begun"). Both sides start, but only one of them finishes.
The final stanza is the bleakest. "We hated Death and hated Life" is a startling line, because it shows anger spilling past its obvious target. Life has become hateful too, perhaps because it gave them something to lose. Then comes "nowhere was to go," and the poem reaches back to its earlier geography: "Than Sea and continent there is / A larger -- it is Woe." The sea and mountain that once seemed like places of refuge are now too small. Woe becomes a territory bigger than the physical world, and there is no horizon to carry the flower toward. The inverted grammar of "Than Sea and continent there is / A larger" makes the reader wait for the answer, and the answer lands as one blunt word.
The rhythm and rhyme help hold this together. The opening is close to a ballad: the first line is a steady eight syllables, followed by a shorter one, and "he" and "Mortality" chime in a loose, slightly off-balance way. Dickinson's rhymes are often approximate, as with "begun" and "Den." The few exact rhymes feel earned, and "go" and "Woe" close the poem with a hard click. Her dashes, kept in the manuscript tradition, break the lines into gasps and hesitations, which suits a speaker who is losing breath.
The poem is worth reading for how it handles an old subject. Dickinson, who lived in Amherst, Massachusetts, and wrote close to eighteen hundred poems, often moved between small domestic objects and enormous abstractions. Here a windowpane becomes the front line of a war with mortality. The poem refuses consolation, ending in anger and exhaustion, and its unusual shape and sudden shifts of tone make that exhaustion feel real.