Winter is the setting, but the poem opens by speaking to a tree as if it were a friend in need of gentle advice. "Drop your leaves for now" is an instruction and also a kind of permission. Letting go is not failure but what an oak does to get through the cold, and the small words "for now" promise that the bareness won't last. The central idea is already in view. A living thing's survival is not guaranteed in advance. It depends on conditions, and some of those conditions are made by people.
The first stanza is a picture of endurance with some warmth in it. The oak must "stand alone in the cold," yet it isn't wholly alone, because squirrels are "sheltering / in your hollows." Hollows usually suggest damage, the empty places in old wood, but here they are homes. The tree is generous even while stripped. Pratt keeps the diction plain and the lines short, so the stanza feels as spare as the branches it describes.
The second stanza looks down instead of up. "Under your feet" gives the oak feet, and that small act of personification makes the tree seem upright and human, which matters when the axe appears later. The acorns are "forgotten," a word that suggests neglect, yet they "already swell," and "already" says the future is under way before winter has finished. The line break after "holding" lets the verb hang for a moment before we learn what each acorn holds: "your pattern encased." Pattern is a well-chosen word. It suggests a blueprint, a design handed on, and "encased" suggests a hard shell protecting it, though a shell can also confine.
The third stanza changes the poem's movement. After two stanzas that end in full stops, the sentence runs on in a list. "Length of day, / strength of sun, / depth of rain" are three parallel phrases, each built on a measurement. The closing sounds of "length," "strength" and "depth" echo one another, and that chant-like echo is the nearest the poem comes to rhyme. Otherwise it is unrhymed free verse, and this is the one place where sound pulls the lines together. Then the pattern breaks. The fourth item is simply "the air," with no "of" and no measurement. The list is shrinking toward bare things.
The stanza break delivers the most important line in the poem, "the axe." It sits in the same grammar, after the same comma, as sunlight and rain. The poem does not denounce it or even raise its voice. Because "air" and "axe" both begin with a vowel sound and are about the same length, the axe slips into the list as easily as the air does. That flatness is chilling. A human decision is placed among the forces the tree cannot control, as if it were another kind of weather.
The final three lines, "your future / contingent / on the world," have no verb. The missing "is" leaves the sentence suspended, which suits its meaning. "Contingent" is the longest and most abstract word in the poem, and nearly everything else is concrete: leaves, squirrels, acorns, rain. It stands alone on its line, so the poem's one abstract statement of its idea cannot be missed. "Your future" is also slightly ambiguous. It could mean the oak's own future or that of the acorns carrying its pattern. The poem lets the two blur, since the pattern is passed on.
The poem is significant for its restraint. In about forty-five words it holds comfort, threat and a whole way of seeing a tree, not as a fixed monument but as one stage in a cycle that others can interrupt. It tells us what to notice without telling us how to feel. The oak is never called vulnerable, and the axe is never called cruel. The poem only lines up the facts, and the reader supplies the unease. The last phrase, "the world," widens from one bare tree in the cold to everything that tree depends on, and that includes us.