Autumn in America does not have a single, fixed date. Its definition varies depending on whether one uses astronomical (based on Earth’s orbit around the sun) or meteorological (based on annual temperature cycles) standards. Additionally, the perception of autumn—marked by foliage color and cooler weather—varies significantly by geographic region due to climate differences.
| Region | Typical Start of Fall Foliage | Typical Peak Fall Color | Notes | |--------|-------------------------------|--------------------------|-------| | (e.g., Maine, Vermont) | Late September | Mid-October | Earliest and most famous autumn; cool nights trigger rapid change. | | Midwest (e.g., Michigan, Ohio) | Early October | Mid-to-late October | Often peaks around Halloween. | | South (e.g., North Georgia, Texas) | Late October | Early-to-mid November | Much later; some areas have mild autumn into December. | | West (Rockies, e.g., Colorado) | Mid-September | Late September to early October | Aspen trees turn golden early at high elevations. | | Pacific Northwest (e.g., Oregon, Washington) | Early October | Late October | Evergreen-dominated, but deciduous trees follow a coastal schedule. | | Southwest (e.g., Arizona, New Mexico) | November | Late November to December | Autumn can be very subtle; some trees turn only after first freeze. | | California (coastal) | November | Late November to December | Very delayed; "fall" often feels like extended summer until rains arrive. | | Florida & Deep South Texas | (No true autumn) | N/A | Subtropical climate; leaves often go from green to brown without significant color change. | when is autumn in america