U.S. Fall Season 2026: Official Start and Foliage Outlook

In the United States, meteorological fall begins on September 1, marking the start of the three‑month autumn period used by weather experts. The astronomical season starts later, on Tuesday, September 22, 2026 at 8:05 p.m. EDT, when the autumnal equinox occurs.

For Iowa, the earlier meteorological date aligns with cooling temperatures, shorter daylight and the onset of typical autumn weather. In New York State, the Old Farmers Almanac’s 2026 fall foliage map predicts that color will first appear in the Adirondacks in late September, spread southward through the Catskills and Hudson Valley, and reach peak coverage around October 20. The map helps leaf‑peepers plan trips to the Hudson Valley, Catskills and other popular spots.

Both pieces emphasize the distinction between the calendar‑based astronomical start and the practical meteorological definition, while offering regional outlooks for autumn activities.