When Does the First Accumulating Snow Usually Arrive in Your Region?
This explainer covers what counts as the first accumulating snow, the typical seasonal schedule across U.S. regions, and how El Niño may shift first-snow timing this winter.
For much of the United States, the first accumulating snow of the season is not a single event. It moves like a slow wave: it starts in the high peaks, spreads across the northern tier, and only later reaches the middle of the country and the South.
The Weather Channel, using National Weather Service data from 1991 through 2020, defines accumulating snow as 0.1 inches or more. Flurries that melt on contact do not count. That measurable-snow threshold makes it possible to compare an October dusting in Montana with a December storm in Virginia.
Where the first snow arrives first
The West starts early. Snow can fall on the highest peaks of the Rockies even in summer, and September is the typical month for the first accumulating snow from the higher elevations of western Montana into the Colorado Rockies.
October is when the northern tier enters the picture. That includes the northern Midwest from northern Michigan to the western Dakotas, the mountains of northern New England, the Adirondacks, the Northern Rockies, and parts of the Plains. New England's higher terrain often records its first measurable snow that month, too.
By November, the map covers more ground. The interior Northeast, Colorado, Utah, the less elevated parts of Wyoming, Oregon's coast, northeastern Nevada, northern New Mexico, the Great Lakes region, Pennsylvania, the rest of New York, Massachusetts, Rhode Island, Connecticut, and higher Appalachian elevations generally join the first-snow list.
When the rest of the country waits
The middle of the United States tends to wait until late November or December. That includes Northern California, the Ohio Valley, Oklahoma, Arkansas, Tennessee, Missouri, Kansas, most of Oregon, and the Texas Panhandle. Along the Interstate 95 corridor from New York City to Virginia, the first accumulating snow is usually a December event.
The Southeast, Southwest, Deep South, and Gulf Coast are last. There, the first accumulating snow, if any falls at all, typically arrives in late December or early January. Mental Floss, citing a Farmers' Almanac map built from previous years' patterns, describes the timeline as an estimate rather than a guarantee.
What El Niño could change
The Weather Channel's outlook says the schedule could shift in an El Niño winter. A classic El Niño winter tends to be wetter than average through much of the southern United States, from parts of California to the Carolinas, partly because the jet stream tracks stronger and farther south. The northern United States, by contrast, tends to run warmer under El Niño, which could mean less snow.
That setup could bring California and Nevada several significant snowfall events, with an earlier-than-average first snowfall possible. The South does not see snow every winter, but a wetter-than-average winter improves the odds of snow arriving in January or February.
None of this is a forecast for a specific city. The regional timeline comes from 30 years of National Weather Service averages, and the Farmers' Almanac map is based on earlier seasons. Real first-snow dates can run ahead of the average, behind it, or miss the expected month entirely — which is why the first flakes often arrive as a surprise.