I read "Stopping by Woods on a Snowy Evening" properly for the first time tonight, in the 1923 New Hampshire (Project Gutenberg #58611). The line I stopped on was the eighth: "The darkest evening of the year." Wikipedia glosses it as "the night of the winter solstice", which this year, as in most recent years, falls on December 21.
Frost gave a date of his own. In the fall of 1947, after a talk at Bowdoin, a University of Maine student named N. Arthur Bleau asked him for his favourite poem. Bleau printed the answer thirty years later in "Robert Frost's Favorite Poem":
"Well—the darkest evening of the year is on December twenty-second—which is the shortest day of the year—just before Christmas."
Then came the story. It was a hard year on the farm. He drove a wagon of produce into town to raise money for the children's presents, found no buyers, and started home as it began to snow. Short of the house the horse stopped near the woods, and "I just sat there and bawled like a baby". In Bleau's telling the snow starts on the way home, as evening comes down. Lesley Frost added a note saying her father had told her the same story, "sometime in the forties, I think", and that Bleau's account matched it "closely, word for word". So both tellings are from the 1940s, forty years after the farm. Her version, though, happens on "that Xmas eve", the horse (Eunice) is pulling a sleigh, and the place is "a hundred yards or so north of our farm on the Wyndham Road."
The date
The Frosts had the Derry, New Hampshire farm from 1900 to 1911. I computed the December solstice for each of those years with PyEphem, in Eastern Standard Time at the farm (about 42.88 N, 71.33 W). Every one fell on December 22. In every one, the 22nd was also the shortest day at Derry. In 1947, the year he told Bleau, the solstice was still the 22nd (11:42 a.m. EST). By 1977, when Bleau printed it, it had moved to the 21st, and it falls on the 21st again this year. Frost's date was the correct one for when he lived it and when he told it. The modern gloss is correct for us. The calendar moved underneath the poem.
The phrase is "darkest evening", though, and the shortest day isn't the earliest evening. At Derry the sun sets earliest on December 9 or 10, at 4:12:45 p.m. On the 22nd it sets at 4:16:07, three minutes and twenty-two seconds later. Dusk is earliest around December 8. The solstice has the longest night, but the dark comes about two weeks before it, and only by a few minutes. Frost treated shortest day and darkest evening as the same thing. So does nearly everyone, me included until I computed it.
The weather
If it happened, when did it happen? Frost said the first five Derry years were "farming altogether and the last five mostly teaching". He started teaching at Pinkerton Academy in 1906. The Christmases with no money would be 1900 to 1905.
I took daily records for four NOAA co-op stations around Derry, each 15 to 20 km away: Manchester, Nashua, Newton and Lawrence, Massachusetts. December 22 had no snow at any of the four in any year from 1900 to 1905. In 1902 the 22nd brought a warm downpour instead: an inch to an inch and three-quarters of rain, with highs of 48 to 54 °F. Snow fell on the solstice in 1906 (four inches at Nashua, eight at Newton), but by then Frost was drawing a salary.
Christmas Eve looked better for a minute. In 1902 the stations logged 3.5 inches at Nashua and 8 at Newton, dated the 25th, with highs in the mid-twenties. If the observers read their gauges in the morning, that snow fell on Christmas Eve night. Carol was born in 1902, so there were two children, and Eunice was probably theirs by then. It was a better fit than anything in the published account, so I checked a newspaper before believing it. The Worcester Spy of 26 December 1902 says: "The snow storm that began in the early afternoon interfered somewhat with Christmas visiting yesterday". It was a Christmas Day storm. Since the stations logged it on the 25th, they read their gauges late in the day, and December 24, 1902 was dry.
That reading hour matters for the 22nd too, because the snow in the story starts at evening. If the gauge was read late in the afternoon, an evening snow on the 22nd would be logged the 23rd. One year has a snow dated the 23rd: 1901, with two inches at Lawrence, 0.3 at Nashua and none at Newton. The Weather Bureau's report from Washington on the night of December 22, printed in the next morning's Worcester Spy, rules it out: "There has been very little precipitation of any kind in any part of the United States during the last two days." It forecast rain or snow for northern New England on Monday, the 23rd. And December 22, 1901 was a Sunday, not a market day.
Someone had already done this properly. William Logan, in Dickinson's Nerves, Frost's Woods (2018), read the December issues of the Derry News for 1900 to 1906, which is closer to the farm than any of my stations. I've only seen his pages as Google Books snippets. He found Christmas Eve snow in 1901, a year when "Lesley was the only child, and the horse could not have been Eunice, bought months later." On the details that can be checked he concludes that the "only part of 'Stopping by Woods' that seems less than fanciful is the frozen lake". The Derry News mentions skating or ice-cutting before most of those Christmases. My four stations fit that. They had rain on December 24, 1901, and up to an inch of snow by the next day's reading, so the rain probably turned to snow that night. Nothing in them rescues either date.
What's left
Frost said December 22 and was right about the calendar. His daughter said Christmas Eve and remembered a horse that wasn't theirs yet. Neither date brought snow in the years they were poor. The darkest evening by the clock was two weeks before either. The poem needs none of this. It never gives a date, it never says why he stopped, and it ends before he gets home. Logan made that point before I did. The market, the presents, the horse's choice to stop and the tears "are not necessary", he writes, and they show "Frost's shrewdness in knowing what to leave out."
If Logan hasn't already made the point, the one thing I can add is the 22nd itself. Frost's date was correct in 1947, and the modern note has moved it.
Sources and what I didn't see. Poem: New Hampshire (Holt, 1923), Project Gutenberg #58611. The Gutenberg heading above the poem drops the "A" ("ON SNOWY EVENING"), but two archive.org scans of the Holt text (goog_a9xaAAAAMAAJ, newhampshirepoem00fros_0) both read "STOPPING BY WOODS ON A SNOWY EVENING" on p. 87 in OCR, so that is a transcription slip. Bleau's essay and Lesley Frost's note are from the text reprinted in The Informed Argument (1992), read online, not in the 1977 printing. The Library of America's "Story of the Week" (December 2019, with "Christmas Trees") paraphrase has the story "three days before Christmas on the night of the solstice", in a sleigh. Neither detail is in Bleau. Frost's letter on the Derry years is quoted on the Frost Farm Trustees' site. Logan: Google Books snippets only, and the "leave out" sentence as the Library of America quotes it. His weather reading may say more than I've seen. Sky: PyEphem, upper limb with 34′ refraction, EST; the 2026 solstice computes to 20:49 UT against the published 20:50. Weather: NCEI GHCN-Daily for USC00275072, USC00275712, USC00275880 and USC00194105, December 19 to 25 of each year 1900 to 1911. Snow is local, and none of these stations is Derry. Worcester Spy, 23 December 1901, 24 December 1901 and 26 December 1902, p. 1, Library of Congress Chronicling America (OCR). Wikipedia quoted 8 October 2026.