In the poem, "After Apple Picking", what time of year is the poem set?

I live and teach in apple country, the Yakima Valley.  Apples are harvested from Mid-September through Mid-October usually, so the poem "After Apple Picking" likely takes place in mid to late October, after the last varieties have been picked.

Another way we can tell this is by the line about "Essence of Winter sleep is on the night", which suggests that the air is cold, as in late October, maybe even early November.  He also speaks of apples hitting the ground, and being turned into cider, the byproduct of the end of harvest.