Overview of the Fall Season in the U.S. Fall in America officially spans September, October, and November (astronomically from the autumnal equinox around September 22–23 to the winter solstice around December 21). Meteorologically, it is often defined as September through November. The season is characterized by cooling temperatures, shorter daylight hours, vibrant foliage (especially in northern and mountainous regions), harvest festivals, and major holidays like Halloween (Oct 31) and Thanksgiving (fourth Thursday in November).
Month-by-Month Breakdown September – The Transition Weather:
Early September often feels like summer, especially in the South and Midwest (“second summer”). By late September, cool fronts begin moving south, bringing crisp mornings and mild afternoons in the Northeast, Midwest, and High Plains. Hurricane season remains active in the Southeast and Gulf Coast.
Highlights:
Labor Day (first Monday) marks the unofficial end of summer. Fall foliage begins in far northern states (e.g., northern Minnesota, Maine, Washington’s North Cascades) by mid-to-late September. Harvest season starts: apple picking, pumpkin patches, and corn mazes open.
Regional notes:
Northeast: Ideal for early leaf-peeping in Vermont, New Hampshire, and upstate New York. South: Still hot and humid; fall feels limited to evenings. West: Dry and warm; wildfire risk remains high in California and the Pacific Northwest. Southwest: Monsoon season tapers off; pleasant desert temperatures. fall in america months
October – Peak Fall Weather:
Widely considered the most “autumnal” month nationwide. Daytime highs: 50s–60s°F (10–20°C) in the North; 70s–80s°F (21–29°C) in the South. First frost arrives in northern tier states by mid-October; snow possible in higher elevations (Rockies, Sierra Nevada).
Highlights:
Peak foliage across much of the Northeast, Midwest, Mid-Atlantic, and Appalachian regions (Great Smoky Mountains, Shenandoah, Ozarks). Halloween events: haunted houses, pumpkin carving, and costume parties. Major harvest festivals and Oktoberfest celebrations. Start of NFL, college football, and MLB postseason.
Regional notes: