vibrant foliage often begin in late September and peak in October. The South (Florida, Gulf Coast): Autumnal weather is much milder and arrives later, often not feeling "cool" until late October or November. The West (Rockies): High altitudes may see autumn colors and early snow as early as late August or early September. 3. Cultural Significance Autumn is a major transitional period in American culture, marked by several key events: September: The start of the school year and the beginning of the
Defining Autumn: An Analysis of Calendar, Meteorological, and Phenological Dates in the United States what month is autumn in usa